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Anais da Academia Brasileira de Ciências

Print version ISSN 0001-3765On-line version ISSN 1678-2690

An. Acad. Bras. Ciênc. vol.91 no.3 Rio de Janeiro  2019  Epub Sep 02, 2019

https://doi.org/10.1590/0001-3765201920180209 

Agrarian Sciences

Molecular identification of three species of Oncideres (Coleoptera: Cerambycidae) using RAPD markers

GLÁUCIA CORDEIRO1 
http://orcid.org/0000-0002-9950-5409

MARINA S. DA CUNHA2 

CAROLINA R. DA SILVA1 

ISAAC R. JORGE1 

JORGE A. DERGAM2 

PAULO S.F. FERREIRA1 

1Departamento de Entomologia, Universidade Federal de Viçosa, Av. P.H. Rolfs, s/n, Centro, 36570-900 Viçosa, MG, Brazil

2Departamento de Biologia Animal, Universidade Federal de Viçosa, Av. P.H. Rolfs, s/n, Centro, 36570-900 Viçosa, MG, Brazil


ABSTRACT

Abstract: Twig girdlers have a short adult life and a long larval stage (up to one year in some species). This fact, together with lack of morphological traits to identify the species from the larval stage, poses obstacles for the taxonomic identification and characterization of the many twig girdlers found in the wild. To solve this matter, Random Amplified Polymorphic DNA (RAPD) molecular markers have been applied to identify some insect species and to determine species boundaries. The aim of this study was to identify three species of Oncideres using the RAPD technique. Adults and larvae of O. saga, O. ocularis and O. ulcerosa were collected in Minas Gerais, Brazil. Two RAPD primers were used (OPA-05 and OPB-13), which produced different electrophoretic profiles that were used to construct a UPGMA phenogram. Three groups identified in the analyses accurately separated the three species, based on individuals in two different stages of development (adults and larvae): I: O. saga, II: O. ulcerosa, and III: O. ocularis. Molecular markers, such as RAPD, are valuable tools that help taxonomists in species identification.

Key words Girdled branches; Insect identification; O. ocularis; O. saga; O. ulcerosa; Twig girdler

INTRODUCTION

The Cerambycidae belonging to the subfamily Lamiinae are known as “twig girdlers” because of their abilities to girdle branches and main trunks of different species of trees. This behavior is exhibited by females, who deposit their eggs between the shell and the wood of the trees by making incisions with their jaws (Calderón-Cortés et al. 2010, G. Cordeiro, unpublished data). Among twig girdlers, the genus Oncideres is widespread throughout the Americas, occurring from southern United States to Argentina and in all Brazilian states (Monné 2002). In Brazil, this genus is represented by 41 described species, including Oncideres saga (Dalman, 1823), Oncideres ocularis (Thomson, 1868) and Oncideres ulcerosa (Germar, 1824). Outbreaks of these species are common in Minas Gerais State, and they are considered as pests due to the injuries they cause to their hosts (Monné 2002).

Species identification is usually made by specialists, taxonomic keys, or through morphological comparison with museum specimens, which sometimes leads to description of a new species. Insect identification is commonly made using adult specimens, and the absence of morphological traits to identify beetles in their early stages of development is a limiting factor to determine species diversity in the field, specially considering that twig girdlers have a short adult life and a long larval stage, which varies from five months up to one year in some species (Lima 1955). In these conditions, molecular markers are potentially useful as a complementary tool to help in species identification. Among a variety of molecular markers, RAPD (Random Amplified Polymorphic DNA) stands out as an easy, fast, and low-cost technique (Lacerda et al. 2002, Sharma and Singh 2017). This method employs primers with arbitrary sequences, which eliminates the need for prior knowledge of the nucleotide sequences flanking the DNA sequence of interest (Suazo et al. 1998) and it is based on the fact that different species produce different amplification profiles (Milach 1998).

Despite the reproducibility problem of this technique, RAPD markers have become one of the most commonly used techniques to identify genetic differences between populations or species and serve as an addition tool for taxon delimitation (Jain et al. 2010, Bajpai 2016a, Singh et al. 2016, Andrić et al. 2017), even when closely related species are considered (Singh et al. 2011, Bajpai 2016b). This technique has been used in the identification of many insect species: Acromyrmex (Hymenoptera) (Grutzmacher et al. 2007), aphids of the family Aphididae (Hemiptera: Sternorrhyncha) (Helmi and Khafaga 2011), cockroaches (Dictyoptera) (Neekhra et al. 2012), Trichogramma spp. (Hymenoptera) (Ercan et al. 2012), Camponotus rufipes Fabricius, 1775 (Hymenoptera) (Matta et al. 2013), moths of the Erebidae family (Lepidoptera) (Sivasankaran et al. 2013), Cochliomyia hominivorax Coquerel, 1858 (Diptera) (Skoda et al. 2013), and in other insects with agronomic interests (Queiroz et al. 2007, 2016, 2017, Haghighi and Kumar 2017, Sharma and Singh 2017, Yadav et al. 2017). In the order Coleoptera, Scolytus schevyrewi Semenov, 1902 and Scolytus multistriatus (Marsham, 1802) (Curculionidae) were accurately differentiated with RAPD profiles (Johnson et al. 2008), as well as ten scarab beetle species (Scarabaeidae) (Zahoor et al. 2013) and three sibling species of Trogoderma dejean (Dermestidae) (Yulin et al. 1999). Yulin et al. (1998) used RAPD to separate three species of Monochamus (Cerambycidae) using adults and larvae individuals. Therefore, the aim of this study was to identify three species of Oncideres (O. saga, O. ocularis and O. ulcerosa) using RAPD markers on adults and larvae specimens.

MATERIALS AND METHODS

SAMPLE COLLECTION

Branches of Acacia mangium Willd., Ficus benjamina L. and Mimosa caesalpiniifolia Benth girdled by O. saga, O. ulcerosa, and O. ocularis, respectively, were collected in Viçosa, Minas Gerais, Brazil (20º 45’ 14” S, 42º 52’ 55” W and 648 m), in January and February 2012. The branches of A. mangium (n = 3) had a length and diameter of 4.35 ± 1.03 m and 4.11 ± 0.41 cm, respectively, and 88 ± 20.46 posture incisions. The branches of F. benjamina (n = 10) had a length and diameter of 1.60 ± 0.14 m and 0.94 ± 0.04 cm, respectively, and 16 ± 2 posture incisions. The branches of M. caesalpiniifolia (n = 10) had a length and diameter of 1.59 ± 0.07 m and 1.57 ± 0.06 cm, respectively, and 13 ± 1 posture incisions. The branches were sampled in areas of occurrence of only one Oncideres spp., as they girgle different tree species - with reference to the 2011 outbreak — to ensure the presence of emerging adults as well as larvae specimens. After the emergence of the adults, the specimens were sent to the taxonomist Prof. Dr. Miguel Angel Monné Barrios for identification, in the Museu Nacional da Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.

The twig girdlers were stored in sealed buckets (65 L) and kept under controlled conditions (temperature: 15 to 30 ºC; relative humidity: 52-87%; and a 12-hour photoperiod; and moistened periodically). The molecular analysis was performed using individuals in two different stages of development: larvae (three individuals of each species) and adults (O. saga: 3 specimens, O. ocularis: 2 specimens, and O. ulcerosa: 1 specimen).

MOLECULAR ANALYSIS WITH RAPD

DNA extraction was performed according to Boyce et al. (1989), using paws from adults and abdomens from larvae. Two RAPD primers were used in the analyses: OPA-05 (5’ – TTCCCCCGCT – 3’) and OPB-13 (5’ – AGGGGTCTTG – 3’) (OPERON Technologies), according to the manufacturer’s instructions. Polymerase chain reactions (PCR) were carried out in 20 µL volume [13.8 µL H2O, 2.0 µL 10x buffer (200 mM Tris-HCl pH 8.4, 500 mM KCl), 0.8 µL of MgCl2 (100 mM), 0.2 µL dNTPs (20 mM), 2.0 µL of each primer (10 μM), 0.2 µL of Taq polymerase (Phoneutria) (2.5 U.µL-1), and 1 µL of DNA (100 ng.µL-1)]. The PCR conditions were: 45 cycles of 15 seconds at 95 ºC, 30 seconds at 35 ºC, and one minute at 72 ºC, with 60 seconds of initial denaturation at 95 ºC and seven minutes of final extension at 72 ºC. The PCR products were electrophoresed at 70 V in 6.0% polyacrylamide gel for approximately three hours, using 0.5X Tris Boric acid (TBE) buffer, along with a DNA molecular size marker, DNA Ladder 1 kb (Sigma) (Hiss et al. 1994).

DATA ANALYSIS

Amplification profiles were compared with each other and with the molecular size marker. Bands of DNA fragments were scored as present (1) or absent (0). The ambiguous bands that could not be clearly discriminated were not included in further analysis. The binary matrices were processed with the FORTRAN RAPDPLOT program to determine the molecular similarity (Kambhampati et al. 1992, Black 1993). An unweighted pair group method with arithmetic averages (UPGMA) was calculated using the PHYLIP 3.5C software package NEIGHBOR option (Felsenstein 1993), and a phenogram was drawn using the DRAWGRAM option of the same package.

RESULTS

Based on the established DNA extraction methodology, it was possible to obtain RAPD electrophoretic profiles from different Oncideres species.

The OPA-05 (Figure 1a) and OPB-13 (Figure 1b) RAPD markers showed different electrophoretic profiles among species, with bands varying from 2.0 to 0.5 kb. The OPA-05 marker had the largest number of polymorphic fragments (Table I) and it may be considered more suitable for the differentiation of twig girdler beetles.

Figure 1 Electrophoretic profiles obtained with two RAPD primers in the three species of Oncideres. (a) OPA-05 primer: 1 and 2 = Oncideres ocularis larvae; 3 = O. ocularis adult; 4, 5, and 6 = O. ulcerosa larvae; 7 and 8 = O. ulcerosa adults; 9 and 10 = O. saga larvae; 11, 12, and 13 = O. saga adults. (b) OPB-13 primer: 1, 2, and 3 = O. saga adults; 4, 5, and 6 = O. saga larvae; 7 and 8 = O. ulcerosa adults; 9, 10, and 11 = O. ulcerosa larvae; 12 = O. ocularis adult; 13, 14, and 15 = O. ocularis larvae. M indicates the molecular marker DNA Ladder 1 Kb (Sigma). Arrows indicate specific bands of interest. 

TABLE I Polymorphism observed among Oncideres species according to the primer used in the RAPD reaction.(%) 

Primer Species Number of amplified fragments Number of polymorphic fragments Percentage of polymorphism(%)
OPA-05 Oncideres saga 27 24 88.9
Oncideres ulcerosa 15 15 100
Oncideres ocularis 15 15 100
OPB-13 Oncideres saga 23 22 95.7
Oncideres ulcerosa 15 11 73.3
Oncideres ocularis 16 2 12.5

The data obtained from the analysis of the electrophoretic profiles were used to estimate the genetic similarity between individuals and the variation between the studied species. The phenogram generated from the UPGMA method showed the presence of three groups: Group I was formed by individuals of O. saga, group II by individuals of O. ulcerosa, and group III by individuals of O. ocularis (Figure 2).

Figure 2 UPGMA phenogram in the three species of Oncideres. Group I: OSD = Oncideres saga adults and OSL = O. saga larvae; Group II: OUD = Oncideres ulcerosa adults and OUL = O. ulcerosa larvae; Group III: OOD = Oncideres ocularis adults and OOL = O. ocularis larvae. 

DISCUSSION

This is the first study to employ a molecular tool to help identify Oncideres species in different stages of development. According to Jain et al. (2010), RAPD markers generate consistent results, produced in optimized conditions, and are useful for phylogenetic inferences and taxonomic classification. This molecular marker has an advantage of the possibility of using a different set of primers and choosing the best for each analysis as different sets of primers often produce different banding patterns that can be used in a variety of studies (Yulin et al. 1998, Grutzmacher et al. 2007, Johnson et al. 2008, Zahoor et al. 2013, Coelho-Bortolo et al. 2016, Preet and Gupta 2017). Therefore, these markers have several entomological applications, for example, in forensic entomology, breeding programs, taxonomic identification of pests of agronomic interests, detection of genetic variation among populations, as well as, in the identification of closely related species (Grzywacz et al. 2012, Ercan et al. 2012, Sivasankaran et al. 2013, Matta et al. 2013, Sunitha et al. 2015, Singh et al. 2016, Haghighi and Kumar 2017, Queiroz et al. 2017, Sharma and Singh 2017).

With regard to species identification, the analysis of electrophoretic profiles has been used in other groups of insects, with satisfactory results (Yulin et al. 1998, 1999, Johnson et al. 2008, Sivasankaran et al. 2013, Zahoor et al. 2013, Bajpai 2016a, b). Queiroz et al. (2005) suggested that RAPD markers could be used for the development of specific primers for Coleoptera species. Moreover, by using one or two RAPD markers, scarab beetles (Coleoptera) could be accurately identified (Zahoor et al. 2013).

The Oncideres species analyzed in the present study (O. saga, O. ocularis and O. ulcerosa) have a long larval stage that varies from five to seven months (C.L. Coutinho, unpublished data, G. Cordeiro, unpublished data), characterizing a major problem in taxonomic identification, because in the wild, they look identical during this developmental stage. The use of the RAPD molecular markers to identify species with identical morphology at early stages of development have been successfully reported, as in flesh flies (Diptera) (Bajpai 2016a), enchancing the power of this technique to the taxonomy field. Yadav et al. (2017) argue that the results of the genetic variability of important economic pests provide useful information that could be used to design suitable strategies to control the spreading of these pests. It may also be useful in determining chemical control methods in relation to a specific host crop and in the management of resistance to insecticides (Coelho-Bortolo et al. 2016, Queiroz et al. 2017, Yadav et al. 2017).

The RAPD identification of these three Oncideres species was confirmed by the taxonomist based on morphological traits of the adults, with the advantage of allowing identification of the individuals in the early stages of development, correctly clustering larvae with adults in their respective species. This is the first study using molecular markers as an auxiliar tool to help identify twig girdles species in Brazil. Additional identification methods for these insects that are considered pests are important to monitor the outbreaks they may cause, damaging tree species in the forest, besides supporting phylogenetic studies.

In conclusion, we can state that the RAPD marker has been efficient in discriminating the Oncideres species and we indicate this technique as an auxiliary tool to identify different species in early stages of development.

ACKNOWLEGMENTS

The authors thank the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) for financial support.

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Received: March 1, 2018; Accepted: September 13, 2018

Correspondence to: Gláucia Cordeiro E-mail: glaucordeiro@gmail.com ORCid: http://orcid.org/0000-0002-9950-5409

AUTHOR CONTRIBUTIONS

Gláucia Cordeiro and Paulo Sérgio Fiuza Ferreira conceived this research and designed the experiments. Gláucia Cordeiro, Marina Souza da Cunha and Jorge Abdala Dergam participated in the design and interpretation of the data. Gláucia Cordeiro, Marina Souza da Cunha, Carolina Rocha da Silva and Isaac Reis Jorge performed experiments and analysis.Gláucia Cordeiro, Marina Souza da Cunha, Carolina Rocha da Silva, Isaac Reis Jorge, Paulo Sérgio Fiuza Ferreira wrote the paper and participated in the revisions of it. All authors read and approved the final manuscript.

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