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Characterization of a Florida plum introduction (USA) in Southern Brazil

Caracterização de uma introdução de ameixa da Florida (EUA) no sul do Brasil

ABSTRACT:

Stone fruit cultivation is an alternative income for rural producers in Brazil, mainly for the southern region. In the specific case of plums, the lack of varieties adapted to the climatic conditions of this region is an obstacle that the research needs to resolve. In this context, the work aimed to evaluate the behaviour of the Japanese plum genotype FLA3-3 from the breeding program of the University of Florida (USA) in Ponta Grossa, Parana, Brazil, during the years 2013, 2014 and 2015. The experimental design used was entirely random. Twenty plants of the genotype under study were used, each one being a repetition. The characteristics evaluated in the field were the flowering and fruiting cycles according to the plant phenology. Physical analyzes of the fruits were carried out in the laboratory: average mass (pulp and seeds) and diameter and chemical analyze: total soluble solids, total titratable acidity and ratio. The results confirm that the genotype is precocious and the fruit harvest begins in October / November. It is adapted to the climatic condition of the municipality of Ponta Grossa, Parana, Brazil, in addition to presenting fruits within the commercial standards sought by producers and consumers. It is a viable alternative for rural producers in the region.

Key words:
Prunus salicina Lindl.; genotype; adaptation.

RESUMO:

O cultivo da fruta com caroço é uma alternativa de renda para os produtores rurais do Brasil, principalmente da região Sul. No caso específico das ameixas, a falta de variedades adaptadas às condições climáticas da região é um entrave que a pesquisa precisa superar. Nesse contexto, o trabalho teve como objetivo avaliar o comportamento do genótipo de ameixa japonesa FLA3-3 do programa de melhoramento da Universidade da Flórida (EUA) em Ponta Grossa, Paraná, Brasil, durante os anos de 2013, 2014 e 2015. O delineamento experimental usado foi inteiramente ao acaso. Foram utilizadas vinte plantas do genótipo em estudo, cada uma sendo uma repetição. As características avaliadas em campo foram os ciclos de floração e frutificação de acordo com a fenologia da planta. As análises físicas dos frutos foram realizadas em laboratório: massa média (polpa e sementes) e diâmetro e análise química: sólidos solúveis totais, acidez total titulável e proporção. Os resultados confirmam que o genótipo é precoce e a colheita dos frutos inicia-se em outubro / novembro. Está adaptado às condições climáticas do município de Ponta Grossa, Paraná, Brasil, além de apresentar frutas dentro dos padrões comerciais buscados por produtores e consumidores, sendo uma alternativa viável para os produtores rurais da região.

Palavras-chave:
Prunus salicina Lindl.; genótipo; adaptação.

INTRODUCTION:

The need for winter cold differentiates between the two centres of origin of plums grown worldwide, those of European origin (Prunus domestica L.) and those that have their center of origin in China known as Japanese plums (Prunus Salicina Lindl), the former need cold winter (temperature ≤ 7.2 °C) above 720 hours and the second is adapted to conditions below this value (HAWERROTH et al., 2010HAWERROTH, F. J. et al. (2010). Dormência em frutíferas de clima temperado. Embrapa Clima Temperado-Documentos (INFOTECA-E).).

They are also differentiated by the colour, size and shape of the fruits, the Japanese plum varies its color between shades of yellow, red, purple, blue and black, having large fruits of rounded oblate shape. At the same time, the European one presents a paler colouration of its fruits, ranging from yellow-green to blue-violet, with medium size and elliptical shape (TAITI et al., 2019TAITI, C. et al. Fruit aroma and sensorial characteristics of traditional and innovative Japanese plum (Prunus salicina Lindl.) cultivars grown in Italy. European Food Research and Technology, v.2, n. 12, p. 2655-2668, 2019. Available from: <Available from: https://doi.org/10.1007/s00217-019-03377-y >. Accessed: Jan. 19, 2021. doi https://doi.org/10.1007/s00217-019-03377-y.
https://doi.org/10.1007/s00217-019-03377...
).

In Brazil, the main varieties of plum cultivated are those of Japanese origin, mainly due to their lower need for winter cold (HAUAGGE & BRUCKNER 2002HAUAGGE, R. & BRUCKNER, C. H. Macieira In: Bruckner, C. H. Melhoramento de fruteiras de clima temperado. Viçosa: UFV, 2002. p.27.). Even using Japanese plums, there are few cultivated varieties of this group, because the country has only in the south region, and some areas of the southeast region have a climate compatible with the needs of the crop (GUERRA et al., 2020GUERRA, M.E. et al. Self-(in) compatibility, S-RNase allele identification, and selection of pollinizers in new Japanese plum-type cultivars. Scientia Horticulturae, v. 2, n. 6, p. 10880-10902, 2020. Available from: <Available from: https://doi.org/10.1016/j.scienta.2019.109022 >. Accessed: Jul. 17, 2020. doi: 10.1016/j.scienta.2019.109022.
https://doi.org/10.1016/j.scienta.2019.1...
). Another factor that can interfere with fruit production is the climate changes that have been occurring, requiring studies on the agronomic performance of new cultivars (MAYER et al., 2019).

Few plum cultivars are available to rural producers in Brazil (MARTINAZZO et al., 2013MARTINAZZO, E. G. et al. Photosynthetic activity in japanese plum under water deficit and flooding. Ciência Rural, v. 43, n. 1, p. 35-41, 2013. Available from: <Available from: https://doi.org/10.1590/S0103-84782012005000126 >. Acessed: Aug. 20, 2020. doi: 10.1590/S0103-84782012005000126.
https://doi.org/10.1590/S0103-8478201200...
; BAUCHROWITZ et al., 2019BAUCHROWITZ, I. M. et al. Comportamento fenológico e qualidade dos frutos de genótipos de ameixa japonesa no municípío de Ponta Grossa-PR. Brazilian Journal of Applied Technology for Agricultural Science, v. 12, n. 2, 2019. Available from: <Available from: http://periodicos.unifil.br/index.php/Revistateste/article/view/1170 >. Accessed: Feb. 21, 2020.
http://periodicos.unifil.br/index.php/Re...
; GABARDO et al., 2020GABARDO, G. et al. Selection of plum genotypes for resistance to leaf scald. Summa Phytopathologica, v. 46, p. 305-307, 2020. Available from: <Available from: https://doi.org/10.1590/0100-5405/238868 >. Accessed: Nov. 16, 2020. doi: 10.1590/0100-5405/238868.
https://doi.org/10.1590/0100-5405/238868...
). Suppose there is a need for breeding programs to launch new options (DALBÓ et al., 2018DALBÓ, M. A. et al. SCS 438 Zafira-a new plum cultivar resistant to leaf scald (Xylella fastidiosa). Crop Breeding and Applied Biotechnology, v. 18, n. 2, p. 229-233, 2018. Available from: <Available from: https://doi.org/10.1590/1984-70332018v18n2c33 >. Accessed: Mar. 27, 2021. doi: 10.1590/1984-70332018v18n2c33.
https://doi.org/10.1590/1984-70332018v18...
; GABARDO et al., 2021GABARDO, G. et al. Plum leaf scald: characteristics of the causative agent, symptoms, dissemination, control and prevention. Revista Brasileira de Fruticultura, v. 43, 2021. Available from: <Available from: https://doi.org/10.1590/0100-29452021009 >. Accessed: Aug. 17, 2021. doi: 10.1590/0100-29452021009.
https://doi.org/10.1590/0100-29452021009...
). The characterization of new plum introductions represents a gain both for breeding programs and directly for small and large rural producers.

Fruit growing in Brazil has been showing a significant increase in its growth levels, either in the planted area or in the quantity of fruits produced. However, the national production of plum is not enough to supply the demand of the domestic market, serving approximately 30% of the annual volume consumed in the country (Secretaria de Comércio Exterior - SECEX 2016Secretaria de Comércio Exterior (SECEX). Available from: <Available from: http://portal.siscomex.gov.br/legislacao/orgaos/secretaria-de-comercio-exterior-secex >. Accessed: Jan. 21, 2019.
http://portal.siscomex.gov.br/legislacao...
). Being necessary to import the product from neighboring countries like Argentina and Chile (FAO, 2019FAO. Area harvested and production of plums and sloes in 2016. 2019. Available from: <Available from: http://www.fao.org/faostat/en/#data/QC >. Accessed: Dec. 17, 2019.
http://www.fao.org/faostat/en/#data/QC...
). What characterizes a deficient market, indicating good potential for expansion to culture in Brazil (EIDAM et al., 2012EIDAM, T. & PAVANELLO, A. P. Ameixeira no Brasil. Revista Brasileira de Fruticultura, v. 34(1), i-i. 2012. Available from: <Available from: https://doi.org/10.1590/S0100-29452012000100001 >. Accessed: Aug. 25, 2020. doi: 10.1590/S0100-29452012000100001.
https://doi.org/10.1590/S0100-2945201200...
).

Combining the need for work on the adaptation of new varieties to climatic conditions and the potential for expansion of the crop, there is a need for studies on new introductions of plum in Brazil, and their viability for rural producers. In this context, this work aimed to evaluate the Japanese plum genotype FLA3-3 of the breeding program of the University of Florida (USA) introduced in the plum breeding program of the Agronomic Institute of Paraná (IAPAR) in the climatic conditions of Ponta Grossa, Paraná, Brazil, during 2013, 2014 and 2015.

MATERIALS AND METHODS:

The experiment was carried out at the Regional Research Pole of the IAPAR, located on the banks of BR-376, in the city of Ponta Grossa, Paraná, Brazil, geographically located at 25°13’S latitude and 50°09’W, with an approximate altitude of 850m. The climate of the region according to the Koppen classification is of the Cfb type, humid subtropical, with an average annual temperature of 18 oC and average annual precipitation of approximately 1.550 mm (IAPAR, 2019aIAPAR - Instituto Agronômico do Paraná. Atlas climático do Paraná. 2019a. Available from: <Available from: http://www.iapar.br/modules/conteudo/conteudo.php?conteudo=2533 >. Accessed: Dec. 12, 2019.
http://www.iapar.br/modules/conteudo/con...
). Meteorological data were collected at the on-site meteorological station (Figure 1).

Figure 1
Precipitation and temperature climatic conditions, collected in the experimental area in Ponta Grossa - PR, in the years 2013, 2014 and 2015. Source: IAPAR (2019a)IAPAR - Instituto Agronômico do Paraná. Horas de frio em ponta grossa. 2019b. Available from: <Available from: http://www.iapar.br/modules/conteudo/conteudo.php?conteudo=2042 >. Accessed: Dec. 18, 2019.
http://www.iapar.br/modules/conteudo/con...
.

The experiment was carried out from May to December 2013, 2014 and 2015. The genotype analyzed is the introduction FLA3-3, produced in the United States, by the University of Florida (SHERMANN & BECKMAN 2002SHERMAN, W. B., & BECKMAN, T. G. (2002, August). Climatic adaptation in fruit crops. In XXVI International Horticultural Congress: Genetics and Breeding of Tree Fruits and Nuts 622 (p. 411-428). Available from: <Available from: https://doi.org/10.17660/ActaHortic.2003.622.43 >. Accessed: Jul. 17, 2020. doi 10.17660/ActaHortic.2003.622.43.
https://doi.org/10.17660/ActaHortic.2003...
). Twenty plants of the genotype under study were used, each one being a repetition, evaluations were carried out within eight months, visiting the plants twice a week to obtain data on the beginning of flowering and fruiting. Phenological assessment scarried out in: beginning of flowering, falling petals, beginning of fruiting and harvest season.

When the fruits reached physiological maturity, for physicochemical evaluations, 200 fruits were collected each year, collected random. The following were evaluated: a) diameter (DM), performed manually with the aid of a caliper and classification of the fruit caliber (Table 1); b) total mass (MF), core mass (MC) and pulp mass (MP), using an analytical balance.

Table 1
Commercial classification of Japanese plum fruits, in different calibers according to the diameter of the fruit. Source: PAVANELLO & AYUB (2012PAVANELLO, A. P. & AYUB, R. A. Application of ethephon thinning in chemical plum and its effect on productivity. Revista Brasileira de Fruticultura , v.34, n.1, p. 309-316, 2012. Available from: <Available from: https://doi.org/10.1590/S0100-29452012000100040 >. Accessed: Jul. 17, 2020. doi: 10.1590/S0100-29452012000100040.
https://doi.org/10.1590/S0100-2945201200...
).

The following chemical analyzes were also performed: a) Total titratable acidity (TTA), stipulated in 2 ml of fruit pulp juice in 10 ml of water, titrated with a 0.1N NAOH solution, until reaching a pH of 8.1, expressing the results as a percentage of malic acid; b) total soluble solids (SST) determined with a manual refractometer (RT-90 ATC), correcting its temperature to 20 ºC and expressing the result in ° Brix; c) ratio (RAT) determined by the relationship between SST / ATT. The data were submitted to the F test by the SISVAR 5.6 program, and when significant, the Tukey mean comparison test at 5% significance was performed.

RESULTS AND DISCUSSION:

The full flowering of the FLA 3-3 genotype occurred between the months of July and August, in the three years (Table 2). In 2015 the flowering cycle was anticipated, and consequently full bloom. In 2015, there was an unusual, winter, accumulating 48 hours of cold, while in the years 2013 and 2014, the accumulated hours of cold were 220 and 104 hours, respectively (IAPAR, 2019b).

Table 2
Phenological data (full bloom and fruit harvest date) for the Japanese plum genotype FLA 3-3 during the years 2013, 2014 and 2015 in Ponta Grossa-Paraná, Brazil.

The negative result of the exposure of plum plants to high temperatures is dependent on the intensity and time of exposure, as plants exposed for two hours at temperatures around 24 °C, can already suffer harmful consequences to their development due to the nullification of the cold (MELKE, 2015MELKE, A. The physiology of chilling temperature requirements for dormancy release and bud-break in temperate fruit trees grown at mild winter tropical climate. Journal of Plant Studies, v. 4, n. 2, 2015. Available from: <Available from: http://dx.doi.org/10.5539/jps.v4n2p110 >. Accessed: Sep. 15, 2020. doi: 10.5539/jps.v4n2p110.
http://dx.doi.org/10.5539/jps.v4n2p110...
).

According to BAUCHROWITZ et al. (2019BAUCHROWITZ, I. M. et al. Comportamento fenológico e qualidade dos frutos de genótipos de ameixa japonesa no municípío de Ponta Grossa-PR. Brazilian Journal of Applied Technology for Agricultural Science, v. 12, n. 2, 2019. Available from: <Available from: http://periodicos.unifil.br/index.php/Revistateste/article/view/1170 >. Accessed: Feb. 21, 2020.
http://periodicos.unifil.br/index.php/Re...
) a plum genotype may present variability in the stages of the beginning of flowering, drop of petals, beginning of fruiting and harvest, related to heterogeneous climatic conditions in each harvest, as they have a direct effect on the phenological cycle of this fruit tree, due to your need in winter cold, justifying the data obtained in the present experiment (Table 2).

The date of full flowering is of great importance in determining the point or time when the fruits can be harvested. However, this method is not highly accurate, interfering mainly when working with plum varieties and different locations (SILVA et al., 2008SILVA, F. P. et al. Productive performance of japanese plum cultivars (Prunus salicina Lindl.) in Caldas, Minas Gerais State. Revista Ciência Agronômica, v. 39, n. 2, p. 281-286, 2008. Available from: <Available from: http://www.ccarevista.ufc.br/seer/index.php/ccarevista/article/view/61 >. Accessed: Jan. 20, 2019.
http://www.ccarevista.ufc.br/seer/index....
). The definition of cycles, whether flowering or harvesting, is of great importance mainly because they are closely related to the adaptation of varieties to different regions.

The harvest took place between 11, 25 and 27 October 2013, 2014 and 2015, respectively (Table 2). Results similar to those obtained by OLIVEIRA (2011OLIVEIRA, M. C. D. et al. Selection of promising plum cultivars for the Mantiqueira Mountain Range. Revista Ceres, v. 58, n.4, p.531-535, 2011. Available from: <Available from: https://doi.org/10.1590/S0034-737X2011000400019 >. Accessed: Jul. 20, 2020. doi: 10.1590/S0034-737X2011000400019.
https://doi.org/10.1590/S0034-737X201100...
) in Delfim Moreira-Minas Gerais, who evaluated the Gulfblaze plum, with the harvest started on October 20th. Unlike the result obtained by OLIVEIRA et al. (2019)OLIVEIRA, J. A. A. et al. Performance of interstocks in the plant development and fruit quality of plum trees. Acta Scientiarum. Agronomy, v. 41. 2019. Available from: <Available from: https://doi.org/10.4025/actasciagron.v41i1.39928 >. Accessed: Jul. 25, 2020. doi: 10.4025/actasciagron.v41i1.39928.
https://doi.org/10.4025/actasciagron.v41...
, where the cultivar Gulfblaze had its harvest in Maria da Fé - Minas Gerais on December 20, showing the difference in the adaptation of the crop in different climatic conditions.

The flowering duration of the FLA 3-3 genotype averaged 26 days (Table 3). In work carried out by MALGARIN et al. (2005) using the Reubennel plum in the Petrolina-Pernambuco region, it was obtained a number of days necessary for the 18-day complete flowering cycle. There is a difference between genotypes.

Table 3
Data on the number of days in the flowering and fruiting cycles of the Japanese plum genotype FLA 3-3 during the years 2013, 2014 and 2015 in Ponta Grossa-Paraná, Brazil.

Regarding the fruiting cycle characteristic, the introduction of FLA 3-3 presented an average cycle of approximately 94 days (Table 3). Similar results to cultivars América, Methley and Irati, with cycles of 94.2, 92.4 and 99.2 days, respectively, when grown in Pelotas-Rio Grande do Sul (DANNER et al., 2010DANNER, M. A. et al. Fruit weight and cycle length repeatability of plum and peach trees. Pesquisa Agropecuária Brasileira, v. 45, n. 8, p. 872-878, 2010. Available from: <Available from: https://doi.org/10.1590/S0100-204X2010000800013 >. Accessed: Apr. 18, 2020. doi: 10.1590/S0100-204X2010000800013.
https://doi.org/10.1590/S0100-204X201000...
). OLIVEIRA et al. (2011OLIVEIRA, M. C. D. et al. Selection of promising plum cultivars for the Mantiqueira Mountain Range. Revista Ceres, v. 58, n.4, p.531-535, 2011. Available from: <Available from: https://doi.org/10.1590/S0034-737X2011000400019 >. Accessed: Jul. 20, 2020. doi: 10.1590/S0034-737X2011000400019.
https://doi.org/10.1590/S0034-737X201100...
) obtained a similar result with the cultivar Reubennel, which took 99 days to complete its fruiting cycle in Maria da Fé-Minas Gerais.

Regarding the average fruit mass of the FLA 3-3 introduction (Table 4), the values ranged from 69.67 to 55.99 g, higher than those obtained by OLIVEIRA et al. (2019LI, Q. et al. Phytochemicals accumulation in Sanhua plum (Prunus salicina L.) during fruit development and their potential use as antioxidants. Journal of agricultural and food chemistry, v. 67, n. 9, 2459-2466, 2019. Available from: <Available from: https://doi.org/10.1021/acs.jafc.8b05087 >. Accessed: Jul. 09, 2020. doi: 10.1021/acs.jafc.8b05087.
https://doi.org/10.1021/acs.jafc.8b05087...
) who found fruits with 60.0 and 41.1g of average mass, for Gulfblaze and Reubennel cultivars, respectively, when grafted on Okinawa peach rootstock.

Table 4
Average data from physical fruit evaluations: fruit mass (MF), seed mass (MC), pulp mass (MP) and fruit diameter (DM) the Japanese plum genotype FLA 3-3 during the years 2013, 2014 and 2015 in Ponta Grossa-Paraná, Brazil.

BAUCHROWITZ et al. (2019BAUCHROWITZ, I. M. et al. Comportamento fenológico e qualidade dos frutos de genótipos de ameixa japonesa no municípío de Ponta Grossa-PR. Brazilian Journal of Applied Technology for Agricultural Science, v. 12, n. 2, 2019. Available from: <Available from: http://periodicos.unifil.br/index.php/Revistateste/article/view/1170 >. Accessed: Feb. 21, 2020.
http://periodicos.unifil.br/index.php/Re...
) obtained from fruits of the introduction FLA 8-3 the mass of the stones between 5.60 to 6.50 g. In the present experiment, similar values were obtained (5.05 to 5.67g). Core mass is of secondary importance because it is related mainly to the production of new plants than to the actual commercialization of the fruit itself (BANDEIRA et al., 2011BANDEIRA, J. D. M. et al. Physiological characterization of reproductive compatibility of Japanese plum. Pesquisa Agropecuária Brasileira, Brasília, v. 46, n. 8, p. 860-867, 2011. Available from: <Available from: https://doi.org/10.1590/S0100-204X2011000800011 >. Accessed: Jan. 10, 2020. doi: 10.1590/S0100-204X2011000800011.
https://doi.org/10.1590/S0100-204X201100...
).

In this work, we use the mass of the stone to help obtain the amount of mass of the pulp, because through the total mass of the fruits excluding the mass of the stones, the mass of the pulp of the fruits can be obtained. The pulp mass of the fruits has great commercial importance, as it is a characteristic related to the amount of usable material produced in the fruits and which will be consumed (KITZBERGER et al., 2017KITZBERGER, C. S. G. et al. Physicochemical and sensory characteristics of plums accesses (Prunus salicina). AIMS AgriFood, v. 2, n.1, p. 101-112, 2017. Available from: <Available from: https://doi.org/10.3934/agrfood.2017.1.101 >. Accessed: Feb. 12, 2021. doi: 10.3934/agrfood.2017.1.101.
https://doi.org/10.3934/agrfood.2017.1.1...
).

In the three harvests (2013, 2014 and 2015), the values obtained for the diameter of the fruits of the introduction FLA 3-3 were 5.1, 4.8 and 4.4 cm, respectively (Table 4), receiving the classification of caliber IV, a fruit of good acceptance and which is in great demand by consumers (PAVANELLO & AYUB 2012PAVANELLO, A. P. & AYUB, R. A. Application of ethephon thinning in chemical plum and its effect on productivity. Revista Brasileira de Fruticultura , v.34, n.1, p. 309-316, 2012. Available from: <Available from: https://doi.org/10.1590/S0100-29452012000100040 >. Accessed: Jul. 17, 2020. doi: 10.1590/S0100-29452012000100040.
https://doi.org/10.1590/S0100-2945201200...
).

On a commercial scale, the average size of the fruits has a direct influence on the viability of an orchard, impacting productivity and profitability, as it can increase production per plant and the price negotiated for the largest size fruits on the market (HF BRASIL 2016HF BRASIL. Hortifruti Brasil. Available from: <Available from: http://www.hfbrasil.org.br/en/average-prices-database-ofhorticultural.aspx?produto=10®iao%5B%5D=91&periodicidade=mensal&ano_inicial= 2015&ano_final=2016 >. Accessed: Apr. 23, 2016.
http://www.hfbrasil.org.br/en/average-pr...
).

AYUB et al. (2019AYUB, R. A. et al. Ammonia thiosulfate in Japanese plum tree thinning. Revista Brasileira de Fruticultura, Jaboticabal, v. 41, n.5, 2019. Available from: <Available from: https://doi.org/10.1590/0100-29452019543 >. Accessed: Jan. 12, 2020. doi: 10.1590/0100-29452019543.
https://doi.org/10.1590/0100-29452019543...
) determined that the Japanese plum of the accessions G52, G7 and G53 did not exceed the value of 4.8 cm. Fruits of the cultivar Poli Rosa have an average diameter of 4.58 cm (MANSOURI et al., 2010MANSOURI, Y. S. et al. Statistical modeling of pomegranate (Punica granatum L.) fruit with some physical attributes. Journal of Food Processing Technology, v. 1, p. 1-4, 2010. Available from: <Available from: https://doi.org/10.4172/2157-7110.1000102 >. Accessed: Jul. 17, 2020. doi: 10.4172/2157-7110.1000102.
https://doi.org/10.4172/2157-7110.100010...
). In the cultivars, Stanley and Tuleu Gras the diameter of the fruits can vary between 3.6 to 5.4 and 3.0 to 4.8 cm, respectively (VLAIC et al., 2014VLAIC, R. A. et al. Physico-Chemical Changes during Growth and Development of Three Plum Varieties. Bull. UASVM Food Science Technology, v. 71, n. 2, 2014. Available from: <Available from: https://doi.org/10.15835/buasvmcn-fst:10686 >. Accessed: Aug. 09, 2020. doi: 10.15835/buasvmcn-fst:10686.
https://doi.org/10.15835/buasvmcn-fst:10...
). Demonstrating that the introduction of FLA 3-3 presents fruits with a diameter similar to cultivars recognized in the market.

Regarding the chemical attributes of the fruits of the FLA 3-3 introduction, similar results were obtained in the years 2013 and 2014 (Table 5). Regarding total soluble solids (SST), higher values were obtained in the years 2013 and 2014, years that presented favorable climatic conditions, when compared to 2015, the year in which there was a significant reduction in SST (Table 5).

Table 5
Average data of chemical evaluations of fruits: total soluble solids (SST), total titratable acidity (ATT), ratio (RAT), the Japanese plum genotype FLA 3-3 during the years 2013, 2014 and 2015 in Ponta Grossa-Paraná, Brazil.

The change in SST in the period of the experiment may have occurred due to some factors, mainly climatic since MALGARIM et al. (2005MALGARIM, M. B. et al. Stage of maturation and temperature variation during the storage on postharvest quality of plums cv. Amarelinha. Revista Brasileira de Fruticultura, v. 27, n.1, p.29-35, 2005. Available from: <Available from: https://doi.org/10.1590/S0100-29452005000100010 >. Accessed: Sep. 04, 2020. doi: 10.1590/S0100-29452005000100010.
https://doi.org/10.1590/S0100-2945200500...
) cite that SST production is favored by the incidence of sunlight under the fruits. In the present study for the year 2015, there was an atypical spring season, with a very high amount of rainfall (Figure 1), which may have affected the amount of lighting available for the production of sugar in the fruits.

Assessing the physicochemical characteristics of ripe fruits of different Japanese plum cultivars grown in Italy, TAITI et al. (2019TAITI, C. et al. Fruit aroma and sensorial characteristics of traditional and innovative Japanese plum (Prunus salicina Lindl.) cultivars grown in Italy. European Food Research and Technology, v.2, n. 12, p. 2655-2668, 2019. Available from: <Available from: https://doi.org/10.1007/s00217-019-03377-y >. Accessed: Jan. 19, 2021. doi https://doi.org/10.1007/s00217-019-03377-y.
https://doi.org/10.1007/s00217-019-03377...
) indicated that the cultivars Dofi Gindy, Laroda, Black Diamond, Fortune, Golden Plum, Settembrine and Angeleno could reach SST amounts of 13.4, 8.70, 11.75, 14.55, 13.87, 15.90 and 15.23 ° Brix, respectively. While fruits of the Black Splendor cultivar have between 12.9 to 13.1 ° Brix, depending on the point of the harvest of the fruits (MINAS et al., 2013MINAS, I. S. et al. Postharvest handling of plums (Prunus salicina Lindl.) at 10 C to save energy and preserve fruit quality using an innovative application system of 1-MCP. Postharvest Biology and Technology, v. 76, p. 1-9, 2013. Available from: <Available from: https://doi.org/10.1016/j.postharvbio.2012.08.013 >. Accessed: Jul. 17, 2020. doi: 10.1016/j.postharvbio.2012.08.013.
https://doi.org/10.1016/j.postharvbio.20...
). They were denoting the overcoming, similarity inferiority of the fruits of the introduction FLA 3-3 in relation to its SST in relation to the cultivars analyzed by the authors mentioned above.

In the fruits of this Introduction, when we analyze the amount of acidity in the fruits, it is possible to observe that in 2014 there were higher values of total titratable acidity (ATT) when purchased with the data obtained in 2013 and 2015 (Table 4). This variation in the amount of ATT in the fruits of the same genotype can be influenced primarily by the point of harvest or by some change in the cycle during the year (SALAZAR et al., 2017SALAZAR, J. A. et al. Genotyping by sequencing for SNP-based linkage analysis and identification of QTLs linked to fruit quality traits in Japanese plum (Prunus salicina Lindl.). Frontiers in Plant Science, v. 8, n. 3, p. 465-476, 2017. Available from: <Available from: https://doi.org/10.3389/fpls.2017.00476 >. Accessed: Jul. 17, 2020. doi: 10.3389/fpls.2017.00476.
https://doi.org/10.3389/fpls.2017.00476...
).

Already, plum fruits of the cultivar Sanhua have values referring to the acidity of the fruits varying between 1.14 to 2.34 %, depending on the color of the pulp of them during their phenological cycle (LI et al., 2019LI, Q. et al. Phytochemicals accumulation in Sanhua plum (Prunus salicina L.) during fruit development and their potential use as antioxidants. Journal of agricultural and food chemistry, v. 67, n. 9, 2459-2466, 2019. Available from: <Available from: https://doi.org/10.1021/acs.jafc.8b05087 >. Accessed: Jul. 09, 2020. doi: 10.1021/acs.jafc.8b05087.
https://doi.org/10.1021/acs.jafc.8b05087...
). In Black Diamond and Angeleno cultivars, ATT can vary between 3.40 to 3.54 % and 5.10 to 5.20 (IMRAK et al., 2019İMRAK, B. et al. Effects of Different pruning Systems on Fruit Yield and Quality in Plum (Prunus salicina Lindl.). Turkish Journal of Agriculture-Food Science and Technology, v. 7, n. 11, p. 1872-1876, 2019. Available from: <Available from: https://doi.org/10.24925/turjaf.v7i11.1872-1876.2809 >. Accessed: Aug. 17, 2020. doi: 10.24925/turjaf.v7i11.1872-1876.2809.
https://doi.org/10.24925/turjaf.v7i11.18...
). Variations in fruit acidity are observed in different peach genotypes when analyzed for selection of future cultivars between 0.52 to 0.84 %, this variation occurs due to genetic differences between the genotypes (WAGNER JÚNIOR et al., 2011WAGNER JÚNIOR, A. et al. High fruit quality peach tree progenies and parents selection. Revista Brasileira de Fruticultura , Jaboticabal, v. 33, n.1, p.170-179, 2011. Available from: <Available from: https://doi.org/10.1590/S0100-29452011005000044 >. Accessed: Jul. 17, 2020. doi: 10.1590/S0100-29452011005000044.
https://doi.org/10.1590/S0100-2945201100...
).

The amount of ratio (RAT) present in the fruits of the introduction FLA 3-3 (Table 5) varied between the analyzes carried out in the different years of study, mainly due to changes that occurred in the characteristics of SST and ATT, which directly influence the amount of Fruit RAT.

The amount of RAT in the plum fruits of the introduction FLA 3-3 for the year 2014, were lower than those obtained by TAITI et al. (2019TAITI, C. et al. Fruit aroma and sensorial characteristics of traditional and innovative Japanese plum (Prunus salicina Lindl.) cultivars grown in Italy. European Food Research and Technology, v.2, n. 12, p. 2655-2668, 2019. Available from: <Available from: https://doi.org/10.1007/s00217-019-03377-y >. Accessed: Jan. 19, 2021. doi https://doi.org/10.1007/s00217-019-03377-y.
https://doi.org/10.1007/s00217-019-03377...
) in all cultivars already mentioned above, with values ranging from 10 to 32.45 for cultivars Laroda and Settembrine, respectively.

In the year 2015, the amount of RAT in the fruits, presented high values of 20.69 (Table 5), this fact occurred mainly due to the low amount of acidity that was present in the fruits. The cultivar Songold has variation in the amount of ratio of fruits depending on the point of maturity of the fruits, varying between 9.25 to 13.8 when the fruits are harvested at the time of fruit maturation (VELARDO-MICHARET et al., 2017VELARDO-MICHARET, B. et al. Effect of ripening stage, 1-MCP treatment and different temperature regimes on long term storage of ‘Songold’Japanese plum. Scientia Horticulturae, v. 214, p. 233-241, 2017. Available from: <Available from: https://doi.org/10.1016/j.scienta.2016.11.043 >. Accessed: Jul. 28, 2020. doi: 10.1016/j.scienta.2016.11.043.
https://doi.org/10.1016/j.scienta.2016.1...
). The cultivar Sanhua has values of 7.98 130 days after full bloom (LI et al., 2019LI, Q. et al. Phytochemicals accumulation in Sanhua plum (Prunus salicina L.) during fruit development and their potential use as antioxidants. Journal of agricultural and food chemistry, v. 67, n. 9, 2459-2466, 2019. Available from: <Available from: https://doi.org/10.1021/acs.jafc.8b05087 >. Accessed: Jul. 09, 2020. doi: 10.1021/acs.jafc.8b05087.
https://doi.org/10.1021/acs.jafc.8b05087...
), while the introduction of FLA 3-3 showed higher values in the three years evaluated.

CONCLUSION:

The introduction of FLA 3-3 during 2013, 2014 and 2015 has the potential to adapt to climatic conditions in the municipality of Ponta Grossa, Paraná, Brazil, producing fruit with commercial quality. It can be recommended for planting in the orchards of producers in the region. It is contributing directly to the Brazilian fruit culture with the insertion of new cultivars in Brazil.

ACKNOWLEDGEMENTS

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001.

REFERENCES

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    CR-2021-0271.R1

Edited by

Editors:

Leandro Souza da Silva (0000-0002-1636-6643) Maria do Céu Cruz (0000-0003-1293-1569)

Publication Dates

  • Publication in this collection
    11 Feb 2022
  • Date of issue
    2022

History

  • Received
    07 Apr 2021
  • Accepted
    16 Aug 2021
  • Reviewed
    23 Nov 2021
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