Genetic variation for an aphid wing polyphenism is genetically linked to a naturally occurring wing polymorphism
Genetic variation for an aphid wing polyphenism is genetically linked to a naturally occurring wing polymorphism
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DOI：
10.1098/rspb.2004.2995
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发表时间：
2005-03-22
影响因子：
4.7
通讯作者：
Stern, DL
中科院分区：
文献类型：
--
作者：
Braendle, C;Friebe, I;Stern, DL
许多多型现象是适应性表型可塑性的例子，其中单个基因型响应环境线索产生不同的表型。这种交替的表型在豌豆蚜（Acyrthosiphon pisum）中表现为有翅和无翅的孤雌生殖雌性。然而，有翼的女性的比例产生在一个给定的环境线索不同的克隆基因型。有翅和无翅的表型也发生在有性世代的雄性中。孤雌生殖的女性，在男性的翅膀生产是环境不敏感和控制的性连锁，双等位基因位点，aphicarus（API）。因此，环境或遗传线索诱导豌豆蚜虫生活史的不同阶段的有翅和无翅表型的发展。我们已经测试了是否等位基因的变化在API基因座解释遗传变异的倾向，以产生有翅膀的女性。我们分析了来自F-2杂交的杂合或纯合的替代API等位基因的克隆产生有翼后代的倾向。我们发现，克隆不同的API基因型不同的倾向，产生有翼的后代。结果表明，控制雌翅多型性和雄翅多型性的因素存在遗传连锁。这一发现是一致的假设，基因型与环境的相互作用在API基因座解释遗传变异的环境线索翼多型。
Many polyphenisms are examples of adaptive phenotypic plasticity where a single genotype produces distinct phenotypes in response to environmental cues. Such alternative phenotypes occur as winged and wingless parthenogenetic females in the pea aphid (Acyrthosiphon pisum). However, the proportion of winged females produced in response to a given environmental cue varies between clonal genotypes. Winged and wingless phenotypes also occur in males of the sexual generation. In contrast to parthenogenetic females, wing production in males is environmentally insensitive and controlled by the sex-linked, biallelic locus, aphicarus (api). Hence, environmental or genetic cues induce development of winged and wingless phenotypes at different stages of the pea aphid life cycle. We have tested whether allelic variation at the api locus explains genetic variation in the propensity to produce winged females. We assayed clones from an F-2 cross that were heterozygous or homozygous for alternative api alleles for their propensity to produce winged offspring. We found that clones with different api genotypes differed in their propensity to produce winged offspring. The results indicate genetic linkage of factors controlling the female wing polyphenism and male wing polymorphism. This finding is consistent with the hypothesis that genotype by environment interaction at the api locus explains genetic variation in the environmentally cued wing polyphenism.