Endogenous Abscisic Acid as a Key Switch for Natural Variation in Flooding-Induced Shoot Elongation
Endogenous Abscisic Acid as a Key Switch for Natural Variation in Flooding-Induced Shoot Elongation
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DOI：
10.1104/pp.110.162792
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发表时间：
2010-10-01
期刊：
影响因子：
7.4
通讯作者：
Voesenek, Laurentius A. C. J.
中科院分区：
文献类型：
--
作者：
Chen, Xin;Pierik, Ronald;Voesenek, Laurentius A. C. J.
叶和茎的伸长是陆生植物在浅而长的洪水中生存的一个关键性状，洪水完全淹没了枝条。然而，不同地点的自然洪水在持续时间和深度上差异很大，因此，这些地点的种群受到不同的选择压力，导致种内变异。在这里，我们确定了信号转导组件，导致响应的变化，在芽伸长之间的两个加入的湿地植物沼泽酸模。这些加入不同的2倍，淹没时，叶柄伸长率，快速伸长发现在人口从河漫滩和缓慢的植物从湖岸伸长。叶柄在水中的快速伸长消耗碳水化合物，并依赖于植物激素乙烯、脱落酸和赤霉酸的（相互）作用。我们发现，碳水化合物的水平和动态在芽之间没有不同的快速和缓慢的伸长植物，但乙烯调节的脱落酸在叶柄的水平，因此赤霉酸的反应，这些叶柄解释了在芽伸长淹没后的差异。由于这是确切的信号转导水平，也解释了植物物种（即，R。palustris和酸模），我们认为自然选择的结果在物种内和物种之间的调节途径类似的修改。
Elongation of leaves and stem is a key trait for survival of terrestrial plants during shallow but prolonged floods that completely submerge the shoot. However, natural floods at different locations vary strongly in duration and depth, and, therefore, populations from these locations are subjected to different selection pressure, leading to intraspecific variation. Here, we identified the signal transduction component that causes response variation in shoot elongation among two accessions of the wetland plant Rumex palustris. These accessions differed 2-fold in petiole elongation rates upon submergence, with fast elongation found in a population from a river floodplain and slow elongation in plants from a lake bank. Fast petiole elongation under water consumes carbohydrates and depends on the (inter) action of the plant hormones ethylene, abscisic acid, and gibberellic acid. We found that carbohydrate levels and dynamics in shoots did not differ between the fast and slow elongating plants, but that the level of ethylene-regulated abscisic acid in petioles, and hence gibberellic acid responsiveness of these petioles explained the difference in shoot elongation upon submergence. Since this is the exact signal transduction level that also explains the variation in flooding-induced shoot elongation among plant species (namely, R. palustris and Rumex acetosa), we suggest that natural selection results in similar modification of regulatory pathways within and between species.