Single-locus sex determination in the parasitoid wasp Cotesia glomerata (Hymenoptera: Braconidae)

Heredity
Y ZhouS Dorn

Abstract

The parasitoid Cotesia glomerata usually produces female-biased sex ratios in the field, which are presumably caused by inbreeding and local mate competition (LMC); yet, sibling mating increases the production of males, leading to the male-biased sex ratio of broods in the laboratory. Previous studies have suggested that the sex allocation strategy of C. glomerata is based on both partial LMC in males and inbreeding avoidance in females. The current study investigated the presence of single-locus complementary sex determination (sl-CSD) as a sex-determining mechanism in this species through inbreeding experiment, cytological examination and microsatellite analysis. Cytological examination detected diploid males in nine of 17 single pairs of sibling mating, thus in agreement with the proportion of matched matings predicted by the sl-CSD model. Sex ratio shifts in these matched sibling matings were consistent with the sl-CSD model with less viable diploid males. The haploid males have a single set of maternal chromosomes (n = 10), whereas diploid males possess a double set of chromosomes (2n = 20). Microsatellite analyses confirmed that diploid males produced from the matched matings inherited segregating genetic materials from b...Continue Reading

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Citations

Sep 7, 2007·Annual Review of Entomology·George E Heimpel, Jetske G de Boer
Jun 27, 2009·Journal of Evolutionary Biology·M K AsplenG E Heimpel
May 1, 2007·Journal of Evolutionary Biology·S VuilleumierO Seehausen
Jan 11, 2007·Journal of Evolutionary Biology·J G De BoerG E Heimpel
Sep 6, 2012·Evolutionary Applications·Jetske G BoerLeo W Beukeboom
May 31, 2015·BMC Evolutionary Biology·Jetske G de BoerRobert H S Kraus
Nov 22, 2016·Ecology·Anaïs BompardThierry Spataro
May 28, 2021·The Journal of Heredity·Brendan J PintoJennifer M Zaspel

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