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Phylogenetic relationship of superior durian (Durio zibethinus) cultivars native to South Kalimantan, Indonesia

Relação flogenética de cultivares superiores de durian (Durio zibethinus) nativas de Kalimantan do Sul, Indonésia

ABSTRACT

Durian, especially Durio zibethinus, is an agricultural commodity with high economic value, both in local and global markets. This study aimed to determine the genetic diversity, relationships and correlation of superior cultivars of D. zibethinus (‘Likol’, ‘Sahang’ and ‘Si Japang’) native to South Kalimantan, Indonesia, using the rbcL marker, and compare them with other 48 cultivars from the GenBank database. All durian rbcL markers were analyzed using the MEGA-X software and phylogenetically reconstructed using two approaches: maximum likelihood (ML) and neighbor-joining (NJ). The durian phylogenetic tree was assessed by bootstrap analysis, and their relationships by Pearson’s correlation and principal component analysis. The durian showed a low genetic diversity (π% = 0.056); however, unique relationships were revealed. Following the rbcL region, this germplasm was grouped into five clades using ML and NJ. In this case, ‘Si Japang’ and ‘Sahang’ showed to be closely related to ‘T16’ from Malaysia, whereas ‘Likol’ was related to ‘Monthong’ from Thailand. However, based on the genetic divergence analysis, ‘Sahang’ had the farthest relationship with three durians from Thailand (‘Metnai Kanyao’, ‘Chok Loi’ and ‘Malet Ar-Ri’).

KEYWORDS
Breeding program; Borneo Island; genetic diversity; horticulture commodity

RESUMO

O durian, especialmente Durio zibethinus, é uma commodity agrícola com alto valor econômico, tanto no mercado local quanto global. Objetivou-se determinar a diversidade genética, relações e correlação de cultivares superiores de D. zibethinus (‘Likol’, ‘Sahang’ e ‘Si Japang’) nativas de Kalimantan do Sul, Indonésia, usando o marcador rbcL, e compará-las com outras 48 cultivares do banco de dados GenBank. Todos os marcadores durian rbcL foram analisados usando o software MEGA-X e flogeneticamente reconstruídos utilizando-se duas abordagens: máxima verossimilhança (ML) e agrupamentos vizinhos (NJ). A árvore flogenética do durian foi avaliada por análise de bootstrap, e suas relações pela correlação de Pearson e análise de componentes principais. O durian apresentou baixa diversidade genética (π% = 0,056); no entanto, relações únicas foram reveladas. Seguindo a região rbcL, esse germoplasma foi agrupado em cinco clados, utilizando-se ML e NJ. Nesse caso, ‘Si Japang’ e ‘Sahang’ mostraram-se intimamente relacionadas com ‘T16’ da Malásia, enquanto ‘Likol’ relacionou-se com ‘Monthong’ da Tailândia. No entanto, com base na análise de divergência genética, ‘Sahang’ apresentou o relacionamento mais distante com três durians da Tailândia (‘Metnai Kanyao’, ‘Chok Loi’ e ‘Malet Ar-Ri’).

PALAVRAS-CHAVE
Programa de melhoramento; Ilha de Bornéu; diversidade genética; commodity hortícola

INTRODUCTION

Durian, especially Durio zibethinus, is an agricultural commodity with high economic value, both in local and global markets (Mursyidin & Daryono 2016MURSYIDIN, D. H.; DARYONO, B. S. Genetic diversity of local durian (Durio zibethinus Murr.) cultivars of South Kalimantan’s province based on RAPD markers. AIP Conference Proceedings, v. 1755, e040008, 2016.), which has become a promising export commodity. For example, in 2020, Indonesia succeeded in exporting this fruit to several other countries, e.g., Malaysia, Singapore, Saudi Arabia and Qatar, with a total transaction of 232 thousand USD (Rizaty 2021RIZATY, M. A. Produksi durian nasional. 2021. Available at: https://databoks.katadata.co.id/datapublish/2021/06/23/produksi-durian-di-indonesia-menurun-pada-2020. Access on: Dec. 03, 2021.
https://databoks.katadata.co.id/datapubl...
). In 2020, Indonesia, as one of the leading producers of durian in the world, produced about 1.19 million metric tons of durian (Statista 2021STATISTA. Production of durian in Indonesia 2011-2020. 2021. Available at: https://www.statista.com/statistics/706504/production-of-durian-in-indonesia/. Access on: Dec. 02, 2021.
https://www.statista.com/statistics/7065...
). However, to meet the export market, the quality of this commodity is still relatively lower than a similar one from two neighboring countries, i.e., Malaysia and Thailand (DHI 2021DURIAN HARVESTS INDONESIA (DHI). Global durian production. 2021. Available at: https://www.durianharvestsindonesia.com/production/. Access on: Dec. 03, 2021.
https://www.durianharvestsindonesia.com/...
). Thus, to improve the quality of durian, several strategic steps included in the breeding task, particularly the development of new superior cultivars, are necessary.

According to Acquaah (2007)ACQUAAH, G. Plant breeding: principles. In: THOMAS, B.; MURRAY, B. G.; MURPHY, D. J. Encyclopedia of applied plant science. 2. ed. New York: Elsevier, 2007. p. 236-242., germplasm collection is an urgent activity in helping the success of plant breeding programs (the development of new superior cultivars). In Indonesia, particularly in the Kalimantan Island, approximately 18 of 27 durian world species have been found, including their wild relatives. While 16 are classifed as endemic species, nine are edible, namely D. zibethinus, D. kutejensis, D. dulcis, D. excelsus, D. lowianus, D. oxleyanus, D. grandiflorus, D. graveolens and D. testudinarium (Mursyidin et al. 2022aMURSYIDIN, D. H.; MAKRUF, M. I.; BADRUZSAUFARI; NOOR, A. Molecular diversity of exotic durian (Durio spp.) germplasm: a case study of Kalimantan, Indonesia. Journal of Genetic Engineering and Biotechnology, v. 20, e39, 2022a.). All durian species have fruit fesh with a distinctive taste, and other morphological characteristics include a high tolerance to environmental stress, such as acidic soil, and diseases, such as patch canker (Uji 2005UJI, T. Keanekaragaman jenis dan sumber plasma nutfah durio (Durio spp.) di Indonesia. Buletin Plasma Nutfah, v. 11, n. 1, p. 28-33, 2005.). Thus, the germplasm is usable as a base population (parental) in breeding programs.

Genetic characterization is also urgent in assisting the durian breeding programs or developing new superior cultivars (Acquaah 2007ACQUAAH, G. Plant breeding: principles. In: THOMAS, B.; MURRAY, B. G.; MURPHY, D. J. Encyclopedia of applied plant science. 2. ed. New York: Elsevier, 2007. p. 236-242.). However, this activity is limited to morphological markers (Mursyidin & Daryono 2016MURSYIDIN, D. H.; DARYONO, B. S. Genetic diversity of local durian (Durio zibethinus Murr.) cultivars of South Kalimantan’s province based on RAPD markers. AIP Conference Proceedings, v. 1755, e040008, 2016.). While these markers have several advantages, they often have limitations, such as multigenic inheritance, and they are strongly infuenced by environmental variables (Jiang 2013JIANG, G. L. Molecular markers and marker-assisted breeding in plants. In: ANDERSEN, S. B. Plant breeding from laboratories to fields. London: IntechOpen, 2013. p. 45-83., Wu et al. 2021WU, F.; MA, S.; ZHOU, J.; HAN, C.; HU, R.; YANG, X.; NIE, G.; ZHANG, X. Genetic diversity and population structure analysis in a large collection of white clover (Trifolium repens L.) germplasm worldwide. PeerJ, v. 9, e11325, 2021.). In addition, these morphological markers are less efficient, because they can only be applied to mature plants or wait for the flowering stage, so they require a longer observation time or are time-consuming (Mursyidin & Daryono 2016MURSYIDIN, D. H.; DARYONO, B. S. Genetic diversity of local durian (Durio zibethinus Murr.) cultivars of South Kalimantan’s province based on RAPD markers. AIP Conference Proceedings, v. 1755, e040008, 2016.). Several molecular markers, such as RAPD, SSR and ISSR, have been applied in studying the genetic diversity and relationships of durian (Vanijajiva 2012VANIJAJIVA, O. The application of ISSR markers in genetic variance detection among durian (Durio zibethinus Murr.) cultivars in the Nonthaburi province, Thailand. Procedia Engineering, v. 32, n. 1, p. 155-159, 2012., Mursyidin & Daryono 2016MURSYIDIN, D. H.; DARYONO, B. S. Genetic diversity of local durian (Durio zibethinus Murr.) cultivars of South Kalimantan’s province based on RAPD markers. AIP Conference Proceedings, v. 1755, e040008, 2016., Santoso et al. 2016SANTOSO, P. J.; GRANITIA, A.; INDRIYANI, N. L. P.; PANCORO, A. Loci analysis and diversity of durian (Durio sp.) germplasm based on microsatellite markers. Jurnal Hortikultura, v. 26, n. 1, p. 9-20, 2016.). However, these markers are very subjective, and their analysis is less accurate (Lee et al. 2017LEE, S. C.; WANG, C. H.; YEN, C. E.; CHANG, C. DNA barcode and identification of the varieties and provenances of Taiwan’s domestic and imported made teas using ribosomal internal transcribed spacer 2 sequences. Journal of Food and Drug Analysis, v. 25, n. 2, p. 260-274, 2017.). Wu et al. (2021)WU, F.; MA, S.; ZHOU, J.; HAN, C.; HU, R.; YANG, X.; NIE, G.; ZHANG, X. Genetic diversity and population structure analysis in a large collection of white clover (Trifolium repens L.) germplasm worldwide. PeerJ, v. 9, e11325, 2021. also reported that these markers have poor consistency, low reproducibility and a relatively complex operation. In this case, molecular characterization is not a substitute, but is complementary for morphological evaluation (Lima et al. 2018LIMA, D. B.; REZENDE-PUKER, D.; MENDONÇA, R. S.; TIXIER, M. S.; GONDIM, M. G. C.; MELO, J. W. S.; OLIVEIRA, D. C.; NAVIA, D. Molecular and morphological characterization of the predatory mite Amblyseius largoensis (Acari: Phytoseiidae): surprising similarity between an Asian and American populations. Experimental and Applied Acarology, v. 76, n. 2, p. 287-310, 2018.).

This study aimed to analyze and determine the nucleotide diversity, relationships and correlations of superior cultivars of durian (D. zibethinus) native to South Kalimantan, in Indonesia, using the rbcL marker - which is universal, generates a high sequence output and provides an unbiased alignment (Dong et al. 2013DONG, Z. Z.; FAN, X.; SHA, L. N.; ZENG, J.; WANG, Y.; CHEN, Q.; KANG, H. Y.; ZHANG, H. Q.; ZHOU, Y. H. Phylogeny and molecular evolution of the rbcL gene of St genome in Elymus sensu lato (Poaceae: Triticeae). Biochemical Systematics and Ecology, v. 50, n. 1, p. 322-330, 2013., Chesters et al. 2015CHESTERS, D.; ZHENG, W. M.; ZHU, C. D. A DNA barcoding system integrating multigene sequence data. Methods in Ecology and Evolution, v. 6, n. 8, p. 930-937, 2015.) and is easy to analyze in most land plants (Hollingsworth et al. 2016HOLLINGSWORTH, P. M.; LI, D. Z.; VAN DER BANK, M.; TWYFORD, A. D. Telling plant species apart with DNA: from barcodes to genomes. Philosophical Transactions of the Royal Society: B, Biological Sciences, v. 371, n. 1702, p. 1-9, 2016.) - and also compare them with other cultivars from the GenBank database.

MATERIAL AND METHODS

This study was conducted at the University of Lambung Mangkurat, Indonesia, from April to September 2021. Of the 51 superior cultivars of durian (D. zibethinus), three were collected from South Kalimantan, in Indonesia, and information on 48 cultivars was obtained from the GenBank database (USA 2022USA. National Center for Biotechnology. Durian rbcL. 2022. Available at: https://www.ncbi.nlm.nih.gov/nucleotide/. Access on: Mar. 29, 2022.
https://www.ncbi.nlm.nih.gov/nucleotide/...
; Table 1).

Table 1
List of durian (Durio zibethinus Murr.) cultivars used in this study, with their rbcL sequence length, accession number and origin.

The DNA was extracted and purifed from the young leaves of durian samples using a plant genomic DNA mini kit from Geneaid Biotech Ltd., Xizhi, New Taipei, Taiwan (GP100). Leaves were collected from durian mother plants with more than 50 years old growing (cultivated) on farmers’ plantations. The DNA was then measured quantitatively using UV-VIS spectrophotometry (GE Healthcare, Chicago, Illinois, United States). Subsequently, the DNA was amplifed using the universal primer rbcL (Gholave et al. 2017GHOLAVE, A. R.; PAWAR, K. D.; YADAV, S. R.; BAPAT, V. A.; JADHAV, J. P. Reconstruction of molecular phylogeny of closely related Amorphophallus species of India using plastid DNA marker and fingerprinting approaches. Physiology and Molecular Biology of Plants, v. 23, n. 1, p. 155-167, 2017.), with a Thermocycler PCR machine (Labnet International Inc., Edison, New Jersey, United States). The primer fanks the rbcL gene partially by about 600 bp. PCR was employed with a total volume of 25 µL [containing 22 µL PCR mix from Bioline, UK (MyTaq HS Red), 2.0 µL forward/reverse primers (10 µM) and 1 µL DNA template (10 ng)]. PCR conditions were set following Mursyidin et al. (2021)MURSYIDIN, D. H.; NAZARI, Y. A.; BADRUZSAUFARI; MASMITRA, M. R. D. DNA barcoding of the tidal swamp rice (Oryza sativa) landraces from South Kalimantan, Indonesia. Biodiversitas, v. 22, n. 4, p. 1593-1599, 2021.: initial denaturation at 94 ºC for 5 min, 40 cycles of denaturation at 94 ºC for 30 s, annealing at 48 ºC for 30 s and extension at 72 ºC for 45 s, and final extension at 72 ºC for 7 min. The DNA target (rbcL) was then separated by electrophoresis using 2 % agarose gel, 1X TBE buffer solution and DNA staining (GelRed, SMOBiO Tech., Taiwan), and observed using a UV transilluminator. The DNA target was purifed and sequenced bi-directionally using the Sanger method (1st Base Ltd., Selangor, Malaysia). All sequences were stored in the GenBank database (Table 1).

Data analysis was initiated by editing and assembling the rbcL sequence of durian using the MEGA-X software (Kumar et al. 2018KUMAR, S.; STECHER, G.; LI, M.; KNYAZ, C.; TAMURA, K. MEGA X: molecular evolutionary genetics analysis across computing platforms. Molecular Biology and Evolution, v. 35, n. 6, p. 1547-1549, 2018.). The rbcL sequences were then aligned by Clustal Omega (Sievers et al. 2020SIEVERS, F.; BARTON, G.; HIGGINS, D. G. Multiple sequence alignments. In: BAXEVANIS, A. D.; BADER, G. D.; WISHART, D. S. (ed.) Bioinformatics. New Jersey: John Wiley & Sons, 2020. p. 227-250.) and analyzed phylogenetically using a similar software (MEGA-X). In this stage, the nucleotide diversity was estimated following Nei & Kumar (2000)NEI, M.; KUMAR, S. Molecular evolution and phylogenetics. New York: Oxford University Press, 2000.. The phylogenetic trees were reconstructed by maximum likelihood (ML) and neighbor-joining (NJ) and evaluated using bootstrapping for 1,000 replicates (Lemey et al. 2009LEMEY, P.; SALEMI, M.; VANDAMME, A. M. The phylogenetic handbook: a practical approach to phylogenetic analysis and hypothesis testing. Cambridge: Cambridge University Press, 2009.). The relationships of durian cultivars were also assessed with the Pearson’s correlation (Taylor 1990TAYLOR, R. Interpretation of the correlation coefficient: a basic review. Journal of Diagnostic Medical Sonography, v. 6, n. 1, p. 35-39, 1990.) and principal component analyses (PCA) (Mursyidin et al. 2022bMURSYIDIN, D. H.; KHAIRULLAH, I.; SYAMSUDIN, R. Genetic diversity and relationship of Indonesian swamp rice (Oryza sativa L.) germplasm based on agro-morphological markers. Agriculture and Natural Resources, v. 56, n. 1, p. 95-104, 2022b.). Finally, the coefficient differentiation or genetic divergence was measured using the Kimura 2-parameter model (Kimura 1980KIMURA, M. A simple method for estimating evolutionary rate of base substitutions through comparative studies of nucleotide sequences. Journal of Molecular Evolution, v. 16, n. 2, p. 111-120, 1980.).

RESULTS AND DISCUSSION

Durian germplasm has unique rbcL sequences. In this study, the durian germplasm has different rbcL sequence lengths, recorded between 529 and 571 bp specifically for native South Kalimantan in Indonesia (Table 1), while all cultivars ranged from 502 to 1,455 bp (Table 2). The diference in the length of this gene sequence was typical, as it occurred in other germplasms, such as that of Amorphophallus. Mursyidin & Hernanda (2021)MURSYIDIN, D. H.; HERNANDA, M. A. Phylogenetic positions of three Amorphophallus species natively growing in the Meratus Mountains, South Kalimantan, Indonesia. Biodiversitas, v. 22, n. 5, p. 2821-2828, 2021. reported that this germplasm has a partial rbcL gene length of 543-1491 bp. For D. zibethinus, especially the ‘Monthong’ cultivar, the rbcL was recorded as being as long as 1,455 bp (Shearman et al. 2020SHEARMAN, J. R.; SONTHIROD, C.; NAKTANG, C.; SANGSRAKRU, D.; YOOCHA, T.; CHATBANYONG, R.; VORAKULDUMRONGCHAI, S.; CHUSRI, O.; TANGPHATSORNRUANG, S.; POOTAKHAM, W. Assembly of the durian chloroplast genome using long PacBio reads. Scientific Reports, v. 10, e15980, 2020.). Following Clegg (1993)CLEGG, M. T. Chloroplast gene sequences and the study of plant evolution. Proceedings of the National Academy of Sciences, v. 90, n. 2, p. 363-367, 1993., the rbcL gene includes 1,431 nucleotides coding for the large subunit protein, and the length varies among angiosperms or most flowering plants.

Table 2
Genetic information of rbcL sequences from durian (Durio zibethinus Murr.) germplasm was used in this study, including superior local cultivars from South Kalimantan, Indonesia.

Conceptually, rbcL encodes ribulose-1, 5-bisphosphate carboxylase/oxygenase (Rubisco), a bifunctional enzyme for plant photosynthesis. This gene is located in the large single-copy region of the plastid genome, with high homology among various genera (Bi et al. 2018BI, Y.; ZHANG, M. F.; XUE, J.; DONG, R.; DU, Y. P.; ZHANG, X. H. Chloroplast genomic resources for phylogeny and DNA barcoding: a case study on Fritillaria. Scientific Reports, v. 8, e1184, 2018.). In this case, from the total length of the sequences found, only 14 loci showed mutations (Table 2). Therefore, the incidence of mutations was low or had high homology. Furthermore, all mutations found in the rbcL sequence of durians were substitutions, i.e., transitions and transversions (Figure 1).

Figure 1
Nucleotide position of polymorphic sites on the rbcL region of durian (Durio zibethinus Murr.) cultivars.

Following Figure 1, the polymorphic sites or mutation events on the rbcL sequences of durian germplasm, especially from South Kalimantan, Indonesia, were found in six nucleotide positions (39, 603, 614, 615, 619 and 620) in the ‘Sahang’ cultivar. It was also present in durian germplasms from Thailand (comparisons), such as ‘Kansan’, ‘Haluk Maithuengphua’ and ‘Metnai’.

In this case, the first mutation was dominant in the transversions (Table 3). According to Aloqalaa et al. (2019)ALOQALAA, D. A.; KOWALSKI, D. R.; BŁAZEJ, P.; WNETRZAK, M.; MACKIEWICZ, D.; MACKIEWICZ, P. The impact of the transversion/transition ratio on the optimal genetic code graph partition. In: INTERNATIONAL CONFERENCE ON BIOINFORMATICS MODELS, METHODS AND ALGORITHMS, 10., 2019, Prague. Proceedings… Setúbal: SciTePress, 2019. p. 55-65., the first type of mutation is more often present in this sequence than in transversions. Hence, it is familiar with molecular evolution (Stoltzfus & Norris 2016STOLTZFUS, A.; NORRIS, R. W. On the causes of evolutionary transition:transversion bias. Molecular Biology and Evolution, v. 33, n. 3, p. 595-602, 2016.). However, mutations are an initial step in establishing the primary population for natural selection and are an integral part of either evolution or genetic diversity (Govindaraj et al. 2015GOVINDARAJ, M.; VETRIVENTHAN, M.; SRINIVASAN, M. Importance of genetic diversity assessment in crop plants and its recent advances: an overview of its analytical perspectives. Genetics Research International, v. 2015, n. 1, p. 1-14, 2015.). Consequently, this phenomenon is the main factor in rising genetic diversity (Frankham et al. 2004FRANKHAM, R.; BALLOU, J. D.; BROSCOE, D. A. A primer of conservation genetics. Cambridge: Cambridge University Press, 2004.).

Table 3
Maximum likelihood estimates of the substitution matrix on the rbcL region of the durian (Durio zibethinus Murr.) germplasm1 1 Under the Kimura 2-parameter model; a transversions; b transitions. .

However, the durian showed a low nucleotide diversity (π%) of only 0.056 (Table 2). According to Gao et al. (2017)GAO, Y.; YIN, S.; YANG, H.; WU, L.; YAN, Y. Genetic diversity and phylogenetic relationships of seven Amorphophallus species in southwestern China revealed by chloroplast DNA sequences. Mitochondrial DNA Part A: DNA Mapping, Sequencing, and Analysis, v. 29, n. 5, p. 679-686, 2017., this is probably due to several factors, such as natural selection, genetic isolation, population decline, founder effect or inbreeding. In this case, inbreeding is the most probable, based on the low level of diversity (Mursyidin et al. 2017MURSYIDIN, D. H.; NAZARI, Y. A.; DARYONO, B. S. Tidal swamp rice cultivars of South Kalimantan province, Indonesia: a case study of diversity and local culture. Biodiversitas, v. 18, n. 1, p. 427-432, 2017.). According to Gao et al. (2017)GAO, Y.; YIN, S.; YANG, H.; WU, L.; YAN, Y. Genetic diversity and phylogenetic relationships of seven Amorphophallus species in southwestern China revealed by chloroplast DNA sequences. Mitochondrial DNA Part A: DNA Mapping, Sequencing, and Analysis, v. 29, n. 5, p. 679-686, 2017., inbreeding may reduce this diversity during domestication. Meanwhile, the latest conditions may correlate with disease resistance and disaster resilience to extreme conditions (Lloyd et al. 2016LLOYD, M. M.; MAKUKHOV, A. D.; PESPENI, M. H. Loss of genetic diversity as a consequence of selection in response to high PCO2. Evolutionary Applications, v. 9, n. 9, p. 1124-1132, 2016.).

This diversity is valuable for generating a primary population for natural selection and evolutionary forces (Govindaraj et al. 2015GOVINDARAJ, M.; VETRIVENTHAN, M.; SRINIVASAN, M. Importance of genetic diversity assessment in crop plants and its recent advances: an overview of its analytical perspectives. Genetics Research International, v. 2015, n. 1, p. 1-14, 2015.). According to Monteiro et al. (2017)MONTEIRO, F.; MARCET, P.; DORN, P. Population genetics of triatomines. In: TELLERIA, J.; TIBAYRENC, M. American trypanosomiasis chagas disease. New York: Elsevier, 2017. p. 169-208., nucleotide diversity represents the average proportion of nucleotide diferences between all possible pairs of sequences obtained for that population. As a result, it is a critical parameter in the evolution of future adaptive changes, or a requirement for future adaptive changes. In other words, nucleotide diversity is a parameter used to measure the degree of polymorphism or genetic diversity within a population (Nei & Li 1979NEI, M.; LI, W.-H. Mathematical model for studying genetic variation in terms of restriction endonucleases. Proceedings of the National Academy of Sciences, v. 76, n. 10, p. 5269-5273, 1979.). Thus, it has a crucial impact on conservation tasks (Lloyd et al. 2016LLOYD, M. M.; MAKUKHOV, A. D.; PESPENI, M. H. Loss of genetic diversity as a consequence of selection in response to high PCO2. Evolutionary Applications, v. 9, n. 9, p. 1124-1132, 2016.).

In this context, understanding genetic diversity is necessary to improve the effectiveness and efficiency of this endeavor. Some variables of conservation, such as genetic diversity loss, can only be managed through extensive population genetic investigations (Luan et al. 2006LUAN, S.; CHIANG, T. Y.; GONG, X. High genetic diversity vs. low genetic differentiation in Nouelia insignis (Asteraceae), a narrowly distributed and endemic species in China, revealed by ISSR fingerprinting. Annals of Botany, v. 98, n. 3, p. 583-589, 2006.). However, inferring genetic diversity from nucleotide diversity using a single plastid locus has several limitations, as the data are not comprehensive. Therefore, two or more molecular markers are suitable for inferring this goal (CBOL Plant Working Group 2009CBOL PLANT WORKING GROUP. A DNA barcode for land plants. Proceedings of the National Academy of Sciences, v. 106, n. 31, p. 12794-12797, 2009.).

Furthermore, information on nucleotide diversity is also valuable for plant breeding purposes. In this situation, breeders use all aspects of plant genetic resources or diversity to develop new superior cultivars with attractive traits, mainly linked to various abiotic and biotic stress adaptations (Swarup et al. 2021SWARUP, S.; CARGILL, E. J.; CROSBY, K.; FLAGEL, L.; KNISKERN, J.; GLENN, K. C. Genetic diversity is indispensable for plant breeding to improve crops. Crop Science, v. 61, n. 2, p. 839-852, 2021.). Additionally, broadening the genetic diversity of the next-generation population enables it to face future changes in environmental conditions. However, only the base population needs a high genetic diversity to adapt rapidly to environmental changes (Lloyd et al. 2016LLOYD, M. M.; MAKUKHOV, A. D.; PESPENI, M. H. Loss of genetic diversity as a consequence of selection in response to high PCO2. Evolutionary Applications, v. 9, n. 9, p. 1124-1132, 2016.). As a result, these eforts are urgent and may be employed in several ways, such as hybridization, introgression and mutagenesis (Allier et al. 2020ALLIER, A.; TEYSSÈDRE, S.; LEHERMEIER, C.; MOREAU, L.; CHARCOSSET, A. Optimized breeding strategies to harness genetic resources with different performance levels. BMC Genomics, v. 21, e349, 2020.).

In addition to nucleotide diversity, the durian showed unique relationships. Following the rbcL region, this germplasm was grouped into five clades for ML and NJ (Figures 2 and 3, respectively). Generally, the superior local cultivars of durian from South Kalimantan were separated from the cultivars. For ML (Figure 2), ‘Si Japang’ and ‘Sahang’ were grouped into the same clade with ‘T16’ (comparison cultivar from Malaysia), whereas ‘Likol’ was grouped with ‘Monthong’ (from Thailand). For NJ (Figure 3), durian from this region was included in the same clade (V) with ‘T16’.

Figure 2
Phylogenetic relationship of durian (Durio zibethinus Murr.) cultivars from South Kalimantan, Indonesia, with others inferred by maximum likelihood (ML).

Figure 3
Phylogenetic relationship of durian (Durio zibethinus Murr.) cultivars from South Kalimantan, Indonesia, with others inferred by the neighbor-joining (NJ) method.

The phylogenetic trees reflected the monophyletic divergence of this germplasm. Slobodian & Pastana (2020)SLOBODIAN, V.; PASTANA, M. N. L. Monophyletic. In: VONK, J.; SHACKELFORD, T. Encyclopedia of animal cognition and behavior. Charm: Springer Nature, 2020. p. 1-6. defined a monophyletic group as a set of taxa descended from a single taxon or common ancestor. A taxon set is described by sharing apomorphic (“derived”) conditions, and members within the set are considered more closely related to each other than to any taxon classifed outside of this group (Slobodian & Pastana 2020SLOBODIAN, V.; PASTANA, M. N. L. Monophyletic. In: VONK, J.; SHACKELFORD, T. Encyclopedia of animal cognition and behavior. Charm: Springer Nature, 2020. p. 1-6.), for example, vascular plants (Kadereit et al. 2016KADEREIT, J. W.; ALBACH, D. C.; EHRENDORFER, F.; GALBANY-CASALS, M.; GARCIA-JACAS, N.; GEHRKE, B.; KADEREIT, G.; KILIAN, N.; KLEIN, J. T.; KOCH, M. A.; KROPF, M.; OBERPRIELER, C.; PIRIE, M. D.; RITZ, C. M.; RÖSER, M.; SPALIK, K.; SUSANNA, A.; WEIGEND, M.; WELK, E.; WESCHE, K.; ZHANG, L. B.; DILLENBERGER, M. S. Which changes are needed to render all genera of the German fora monophyletic? Willdenowia, v. 46, n. 1, p. 39-91, 2016.), the Psammolestes genus (Oliveira et al. 2018OLIVEIRA, J.; CHABOLI-ALEVI, K. C.; RAVAZI, A.; HERRERA, H. M.; SANTOS, F. M.; AZEREDO-OLIVEIRA, M. T. V. de; ROSA, J. A. da. New evidence of the monophyletic relationship of the genus Psammolestes Bergroth, 1911 (Hemiptera, Reduviidae, Triatominae). The American Journal of Tropical Medicine and Hygiene, v. 99, n. 6, p. 1485-1488, 2018.) and dinofagellates (Orr et al. 2012ORR, R. J. S.; MURRAY, S. A.; STÜKEN, A.; RHODES, L.; JAKOBSEN, K. S. When naked became armored: an eight-gene phylogeny reveals monophyletic origin of theca in dinofagellates. PLoS ONE, v. 7, n. 11, p. 1-15, 2012.).

The different features were shown by PCA (Figure 4), where ‘Likol’ was near ‘Si Japang’ and ‘Sahang’ was near ‘KR2618’ and ‘D194’. A close relationship was also revealed between ‘Monthong’ (a superior cultivar of Thailand) and ‘D197’ and ‘D13’ from Malaysia. A similar grouping was reported by Siew et al. (2018)SIEW, G. Y.; NG, W. L.; SALLEH, M. F.; TAN, S. W.; KY, H.; ALITHEEN, N. B. M.; TAN, S. G.; YEAP, S. K. Assessment of the genetic variation of Malaysian durian varieties using inter-simple sequence repeat markers and chloroplast DNA sequences. Pertanika Journal Tropical Agriculture Science, v. 41, n. 1, p. 321-332, 2018. using SSR markers. According to Teh et al. (2017)TEH, B. T.; LIM, K.; YONG, C. H.; NG, C. C. Y.; RAO, S. R.; RAJASEGARAN, V.; LIM, W. K.; ONG, C. K.; CHAN, K.; CHENG, V. K. Y.; SOH, P. S.; SWARUP, S.; ROZEN, S. G.; NAGARAJAN, N.; TAN, P. The draft genome of tropical fruit durian (Durio zibethinus). Nature Genetics, v. 49, n. 11, p. 1633-1641, 2017., the difference between ‘Monthong’ and ‘D197’ (also known as ‘Musang King’) lies in fruit weight, fruit flesh color, fragrance and sweetness level. In this case, ‘Monthong’ has heavier fruits with fragrant and sweet fruit fesh favors, while ‘D197’, although smaller, has a strong aroma and sweet fruit fesh taste (Teh et al. 2017TEH, B. T.; LIM, K.; YONG, C. H.; NG, C. C. Y.; RAO, S. R.; RAJASEGARAN, V.; LIM, W. K.; ONG, C. K.; CHAN, K.; CHENG, V. K. Y.; SOH, P. S.; SWARUP, S.; ROZEN, S. G.; NAGARAJAN, N.; TAN, P. The draft genome of tropical fruit durian (Durio zibethinus). Nature Genetics, v. 49, n. 11, p. 1633-1641, 2017.).

Figure 4
Grouping of durian (Durio zibethinus Murr.) cultivars from South Kalimantan, Indonesia, with other cultivars inferred by principal component analysis (PCA).

Based on genetic divergence analysis (Figure 5), most durian germplasms have a close relationship, except for ‘Sahang’ and three durian cultivars of Thailand (‘Metnai Kanyao’, ‘Chok Loi’ and ‘Malet Ar-Ri’), which have the farthest evolutionary divergence of 18.89. The results were also supported by a Pearson’s correlation, where most of the durian germplasms had strong relationships (Figure 6). According to Flint-Garcia (2013)FLINT-GARCIA, S. A. Genetics and consequences of crop domestication. Journal of Agricultural and Food Chemistry, v. 61, n. 35, p. 8267-8276, 2013., this phylogenetic information is valuable for conservation and breeding eforts. In other words, these results may be applied to analyze species delineation, genetic divergence and gene flow, also inferring species and their evolutionary history (Fernández-García 2017FERNÁNDEZ-GARCÍA, J. L. Phylogenetics for wildlife conservation. In: ABRURAKHMONOV, I. Y. Phylogenetics. London: IntechOpen, 2017. p. 27-46.).

Figure 5
Genetic divergence among durian (Durio zibethinus Murr.) cultivars from South Kalimantan, Indonesia, and other cultivars.

Figure 6
Pearson’s correlation among durian (Durio zibethinus Murr.) cultivars from South Kalimantan, Indonesia, and other cultivars.

For plant breeding, this information could be applied to forecast the genetic diversity of progeny (Acquaah 2007ACQUAAH, G. Plant breeding: principles. In: THOMAS, B.; MURRAY, B. G.; MURPHY, D. J. Encyclopedia of applied plant science. 2. ed. New York: Elsevier, 2007. p. 236-242.). In concept, when individuals with distant relationships cross, progeny may vary widely. Conversely, when there is a closely related cross, the genetic diversity is narrow (Acquaah 2007ACQUAAH, G. Plant breeding: principles. In: THOMAS, B.; MURRAY, B. G.; MURPHY, D. J. Encyclopedia of applied plant science. 2. ed. New York: Elsevier, 2007. p. 236-242., Turner-Hissong et al. 2020TURNER-HISSONG, S. D.; MABRY, M. E.; BEISSINGER, T. M.; ROSS-IBARRA, J.; PIRES, J. C. Evolutionary insights into plant breeding. Current Opinion in Plant Biology, v. 54, n. 2, p. 93-100, 2020.). In this case, the durian ‘Likol’ of South Kalimantan might be crossed with ‘Monthong’ from Thailand.

Based on agro-morphological characteristics, although ‘Likol’ has a sweet and savory fruit fesh taste, its thickness is lacking. However, ‘Monthong’ from Thailand has a thick fruit fesh. In addition, the ‘Likol’ fruit flesh is less fragrant, unlike ‘Monthong’. Based on the fruit performance, ‘Likol’ has a relatively thin fruit skin, while ‘Monthong’ is thick. According to Lara et al. (2019)LARA, I.; HEREDIA, A.; DOMÍNGUEZ, E. Shelf life potential and the fruit cuticle: the unexpected player. Frontiers in Plant Science, v. 10, n. 6, e770, 2019., the thickness of the fruit skin correlates with storage potential or shelf life. Although this cross has not yet been carried out, an example of the Malaysian durian, namely ‘D190’, is the hybrid of ‘D24’ and ‘D10’ (Siew et al. 2018SIEW, G. Y.; NG, W. L.; SALLEH, M. F.; TAN, S. W.; KY, H.; ALITHEEN, N. B. M.; TAN, S. G.; YEAP, S. K. Assessment of the genetic variation of Malaysian durian varieties using inter-simple sequence repeat markers and chloroplast DNA sequences. Pertanika Journal Tropical Agriculture Science, v. 41, n. 1, p. 321-332, 2018.).

The results of this study are important for supporting future breeding and conservation programs of durian germplasm, both locally and globally.

CONCLUSIONS

  1. While the durian cultivars from South Kalimantan, in Indonesia, had a low nucleotide diversity (π% = 0.056), they presented unique relationships;

  2. ‘Si Japang’ and ‘Sahang’ are cultivars closely related to ‘T16’ from Malaysia, whereas ‘Likol’ was related to ‘Monthong’ from Thailand. The two latest cultivars might be crossed to obtain new superior characteristics;

  3. Based on the genetic divergence analysis, ‘Sahang’ had the farthest relationship to the three durian cultivars from Thailand, namely ‘Metnai Kanyao’, ‘Chok Loi’ and ‘Malet Ar-Ri’.

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Publication Dates

  • Publication in this collection
    10 Oct 2022
  • Date of issue
    2022

History

  • Received
    16 Apr 2022
  • Accepted
    15 Aug 2022
  • Published
    09 Sept 2022
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