First detection of chromosomal inversions in a natural population of the invasive pest species Drosophila suzukii
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Ó Indian Academy of Sciences (0123456789().,-volV) (0123456789().,-volV)
RESEARCH NOTE
First detection of chromosomal inversions in a natural population of the invasive pest species Drosophila suzukii ` UDIA LAGARES1 and FRANCESC MESTRES1,2* CARLA ESTEVE1, CLA 1Departament
de Gene`tica, Microbiologia i Estadı´stica, Seccio´ Gene`tica Biome`dica, Evolucio´ i Desenvolupament, Universitat de Barcelona, Av. Diagonal, 643, 08028 Barcelona, Spain 2IRBio-Institut de Recerca de la Biodiversitat, Universitat de Barcelona, Av. Diagonal, 643, 08028 Barcelona, Spain *For correspondence. E-mail: [email protected]. Received 7 July 2020; revised 27 July 2020; accepted 29 July 2020 Abstract. Drosophila suzukii is native to East and Southeast Asia and spread very fast around the world being considered an invasive pest species. Many demographic, population genetics and genomic studies have been recently developed, but so far no analysis has been carried out regarding the presence of chromosomal inversions in D. suzukii natural populations. In this research, we studied polytene chromosomes of flies collected from the Font Groga (Barcelona) population. The chromosomes and many of their segments were characterized for their similarity with those from D. melanogaster. This is the report of one paracentric inversion (in heterozygous condition) in the right arm of the third chromosome (3R). As far as we know, it is the first time that an inversion has been observed in a D. suzukii natural population. Finally, the evolutionary significance of the finding of inversions in this species is discussed. Keywords.
invasive species; polytene chromosomes; chromosomal inversions; adaptation; D. suzukii.
Introduction Drosophila suzukii is an invasive pest species native to East and Southeast Asia that spread very fast around the world (Walsh et al. 2011). For instance, it was first detected in Europe in 2008 (Calabria et al. 2012) and showed a rapid expansion across the continent (Cini et al. 2012; Asplen et al. 2015; Arno´ et al. 2016; Lavrinienko et al. 2017). In this species, males are characterized by a dark spot on the leading edge close to the tip of the wings and females present a serrated ovipositor which is able to cut the fruits skin and lay their eggs inside them. From a systematic point of view and based on the morphology of male external genital apparatus, D. suzukii was classified in the group melanogaster and subgroup suzukii (Hsu 1949). The metaphase chromosomes also confirmed its connection to the melanogaster group, with a karyotype composed of four chromosomes: two metacentric, one acrocentric and one dot (Lemenieur et al. 1986). This result has been Carla Esteve and Cla`udia Lagares have contributed equally to this work.
recently confirmed by Drosopoulou et al. (2019) who also developed polytene chromosomal maps of this species. Using in situ hybridization of 12 gene markers, they detected regions of synteny with D. melanogaster. Further, genomic analysis of D. suzukii allowed comparing the similarities at molecular level with D. mela
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