Dioecy in Amborella trichopoda: evidence for genetically based sex determination and its consequences for inferences of the breeding system in early angiosperms
Dioecy in Amborella trichopoda: evidence for genetically based sex determination and its consequences for inferences of the breeding system in early angiosperms
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DOI：
10.1093/aob/mcw278
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发表时间：
2017-03-01
期刊：
影响因子：
4.2
通讯作者：
Gateble, Gildas
中科院分区：
文献类型：
--
作者：
Anger, Nicolas;Fogliani, Bruno;Gateble, Gildas
背景和目的这项工作的目的是深入了解的基础上生活的被子植物的繁殖系统，通过两个字符状态重建和性别比例和表型的研究可能的妹妹，所有其他生活的被子植物，Amborella plapoda.Methods性别表型被映射到一个系统发育的基础上分歧被子植物使用最大简约。与此同时，在一个迁地种群中研究了连续两个花期的性比和表型。关键结果简约性分析未能解决目前在生活被子植物的基础上的育种系统，但表明了A。为将来阐明这一问题提供参考。迁地A.研究表明，虽然在研究的原位种群中发现了性比偏差，但研究的节肢动物种群的初级性比接近1：1。结论性比数据支持遗传性别决定在中国南方古猿中的存在。对这一概念的进一步阐明，可能会指导以现存被子植物为基础的育种系统的推论。性不稳定A.单足纲暗示了表观遗传机制的运作，以及雌雄异株中间体对雌雄异株的进化。
Background and Aims This work aimed to gain insight into the breeding system at the base of living angiosperms through both character state reconstructions and the study of sex ratios and phenotypes in the likely sister to all other living angiosperms, Amborella trichopoda.Methods Sex phenotypes were mapped onto a phylogeny of basally diverging angiosperms using maximum parsimony. In parallel, sex ratios and phenotypes were studied over two consecutive flowering seasons in an ex situ population of A. trichopoda, while the sex ratio of an in situ population was also assessed.Key Results Parsimony analyses failed to resolve the breeding system present at the base of living angiosperms, but indicated the importance of A. trichopoda for the future elucidation of this question. The ex situ A. trichopoda population studied showed a primary sex ratio close to 1:1, though sex ratio bias was found in the in situ population studied. Instances of sexual instability were quantified in both populations.Conclusions Sex ratio data support the presence of genetic sex determination in A. trichopoda, whose further elucidation may guide inferences on the breeding system at the base of living angiosperms. Sexual instability in A. trichopoda suggests the operation of epigenetic mechanisms, and the evolution of dioecy via a gynodioecious intermediate.