Temperature stress increases hybrid incompatibilities in the parasitic wasp genus Nasonia

被引:22
作者
Koevoets, T. [1 ]
Van De Zande, L. [1 ]
Beukeboom, L. W. [1 ]
机构
[1] Univ Groningen, Ctr Ecol & Evolutionary Studies, NL-9700 CC Groningen, Netherlands
关键词
cytonuclear interaction; haplodiploidy; hybrid incompatibilities; temperature stress; transmission ratio distortion loci; DROSOPHILA-MELANOGASTER; POSTZYGOTIC ISOLATION; CYTOCHROME-C; HEAT-STRESS; EXPRESSION; SPECIATION; BREAKDOWN; NUCLEAR; MITOCHONDRIAL; GENES;
D O I
10.1111/j.1420-9101.2011.02424.x
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Hybrid incompatibilities, measured as mortality and sterility, are caused by the disruption of gene interactions. They are important post-zygotic isolation barriers to species hybridization, and much effort is put into the discovery of the genes underlying these incompatibilities. In hybridization studies of the haplodiploid parasitic wasp genus Nasonia, genic incompatibilities have been shown to affect mortality and sterility. The genomic regions associated with mortality have been found to depend on the cytotype of the hybrids and thus suggest cytonuclear incompatibilities. As environmental conditions can affect gene expression and gene interaction, we here investigate the effect of developmental temperature on sterility and mortality in Nasonia hybrids. Results show that extreme temperatures strongly affect both hybrid sterility (mainly spermatogenic failure) and mortality. Molecular mapping revealed that extreme temperatures increase transmission ratio distortion of parental alleles at incompatible loci, and thus, cryptic incompatible loci surface under temperature stress that remain undiscovered under standard temperatures. Our results underline the sensitivity of hybrid incompatibilities to environmental factors and the effects of unstable epistasis.
引用
收藏
页码:304 / 316
页数:13
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