ABA inhibits root cell elongation through repressing the cytokinin signaling
ABA inhibits root cell elongation through repressing the cytokinin signaling
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DOI：
10.1080/15592324.2019.1578632
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发表时间：
2019-02
影响因子：
2.9
通讯作者：
Hirotomo Takatsuka;M. Umeda
中科院分区：
文献类型：
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作者：
Hirotomo Takatsuka;M. Umeda
根细胞伸长是根向土壤渗透的重要环节，它对多种环境因子有反应。先前的研究表明，脱落酸，一种参与应激反应的植物激素，通过延迟细胞伸长的开始来抑制根的生长。相反，我们最近报道，细胞分裂素促进根细胞的伸长，通过增强肌动蛋白捆绑。然而，通过脱落酸和细胞分裂素信号之间的相互作用控制根细胞伸长尚未被发现。在这里，我们表明，脱落酸诱导的细胞伸长延迟需要抑制细胞分裂素信号传导;此外，压力信号传导到细胞伸长的途径介导的B型拟南芥反应调节因子2（ARR 2），这阻碍了根的生长。
ABSTRACT Cell elongation, which plays an important role in root penetration into the soil, responds to a variety of environmental factors. A previous study demonstrated that abscisic acid, a phytohormone involved in stress responses, inhibits root growth by delaying the onset of cell elongation. In contrast, we recently reported that cytokinins promote elongation of root cells by enhancing actin bundling. However, the control of root cell elongation through the interaction between abscisic acid and cytokinin signaling has not yet been uncovered. Here, we show that abscisic acid-induced delay in cell elongation requires inhibition of cytokinin signaling; further, stress is signaled to cell elongation by the pathway mediated by B-type ARABIDOPSIS RESPONSE REGULATOR 2 (ARR2), which retards root growth.