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

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 both parents. Thus, this study provides the first solid evidence for the presence of sl-CSD as a sex-determining mechanism in the braconid genus Cotesia.

journal_name

Heredity (Edinb)

journal_title

Heredity

authors

Zhou Y,Gu H,Dorn S

doi

10.1038/sj.hdy.6800829

subject

Has Abstract

pub_date

2006-06-01 00:00:00

pages

487-92

issue

6

eissn

0018-067X

issn

1365-2540

pii

6800829

journal_volume

96

pub_type

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