Endogenous Abscisic Acid as a Key Switch for Natural Variation in Flooding-Induced Shoot Elongation

被引:44
作者
Chen, Xin [1 ,2 ]
Pierik, Ronald [1 ]
Peeters, Anton J. M. [1 ]
Poorter, Hendrik [1 ]
Visser, Eric J. W. [2 ]
Huber, Heidrun [2 ]
de Kroon, Hans [2 ]
Voesenek, Laurentius A. C. J. [1 ,3 ]
机构
[1] Univ Utrecht, Inst Environm Biol, NL-3584 CH Utrecht, Netherlands
[2] Radboud Univ Nijmegen, Dept Expt Plant Ecol, Inst Water & Wetland Res, NL-6525 AJ Nijmegen, Netherlands
[3] Ctr BioSyst Genom, NL-6708 PB Wageningen, Netherlands
关键词
DEEP-WATER RICE; INDUCED PETIOLE ELONGATION; RUMEX-PALUSTRIS; SUBMERGENCE TOLERANCE; ABA 8'-HYDROXYLASE; STEM ELONGATION; PLANT HORMONES; SATIVA L; ETHYLENE; GROWTH;
D O I
10.1104/pp.110.162792
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
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.
引用
收藏
页码:969 / 977
页数:9
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