Abscisic acid controlled sex before transpiration in vascular plants
Abscisic acid controlled sex before transpiration in vascular plants
复制标题
DOI：
10.1073/pnas.1606614113
复制
发表时间：
2016-11-08
影响因子：
11.1
通讯作者：
Sussmilch, Frances C.
中科院分区：
文献类型：
--
作者：
McAdam, Scott A. M.;Brodribb, Timothy J.;Sussmilch, Frances C.
动物和植物的有性生殖有着共同的要素，包括精子和卵子的产生，但与动物不同的是，人们对决定植物性别的调控途径知之甚少。在这里，我们使用突变体和基因沉默的蕨类植物物种，以确定在植物性别分化的核心调控机制。植物激素脱落酸（阿坝）是蕨类植物性别分化的一个关键因素，它在生殖周期中调节雄性与两性组织的性别比例。我们的分析表明，在蕨类植物Ceratopteris richardii中，与显花植物中的核心阿坝转导基因[SNF 1相关激酶2s（SnRK 2s）]同源的基因主要负责性别决定的激素控制。此外，我们提供的证据表明，这ABA-SnRK 2信号通路已经从确定性别的蕨类植物控制种子休眠在最早的种子植物被增选之前，控制蒸腾和CO2交换衍生种子植物。通过追溯这一阿坝信号通路的进化历史，从植物繁殖到它在过去4.5亿年中植物-大气气体交换的全球调节中的作用，我们强调了ABA-SnRK 2信号通路在植物进化和植被功能中的非凡作用。
Sexual reproduction in animals and plants shares common elements, including spermand egg production, but unlike animals, little is known about the regulatory pathways that determine the sex of plants. Here we use mutants and gene silencing in a fern species to identify a core regulatory mechanism in plant sexual differentiation. A key player in fern sex differentiation is the phytohormone abscisic acid (ABA), which regulates the sex ratio of male to hermaphrodite tissues during the reproductive cycle. Our analysis shows that in the fern Ceratopteris richardii, a gene homologous to core ABA transduction genes in flowering plants [SNF1-related kinase2s (SnRK2s)] is primarily responsible for the hormonal control of sex determination. Furthermore, we provide evidence that this ABA-SnRK2 signaling pathway has transitioned from determining the sex of ferns to controlling seed dormancy in the earliest seed plants before being co-opted to control transpiration and CO2 exchange in derived seed plants. By tracing the evolutionary history of this ABA signaling pathway from plant reproduction through to its role in the global regulation of plant-atmosphere gas exchange during the last 450 million years, we highlight the extraordinary effect of the ABA-SnRK2 signaling pathway in plant evolution and vegetation function.