Hydrogen peroxide modulates abscisic acid signaling in root growth and development in Arabidopsis
Hydrogen peroxide modulates abscisic acid signaling in root growth and development in Arabidopsis
复制标题
过氧化氢调节拟南芥根生长和发育中的脱落酸信号传导
DOI：
10.1007/s11434-007-0179-z
复制
发表时间：
2007-04-01
影响因子：
--
通讯作者：
Cao MingQing
中科院分区：
文献类型：
--
作者：
Bai Ling;Zhou Yun;Cao MingQing
外源脱落酸（ABA）可以抑制拟南芥根系生长，促进根尖形成更多根毛。然而，根部 ABA 信号传导的分子机制在很大程度上尚不清楚。我们在此报告过氧化氢（H2O2）降低了野生型的根系生长，并且H2O2对根系生长的表型与ABA反应相似。同时，在野生型中，ABA 诱导的根系形态变化可以被抗坏血酸部分逆转，而在 NADPH 氧化酶缺陷突变体 atrbohF 和 atrbohC 中则被消除。此外，ABA 可以诱导根细胞中 H2O2 的积累，并增强 OXI1 的转录水平，这对于更多 AOS 依赖性过程（例如拟南芥根毛生长）是必需的。我们的结果表明，H2O2 作为重要的信号分子是拟南芥中 ABA 调节的根生长和发育所必需的。
Exogenous abscisic acid (ABA) can inhibit root growth and promote formation of more root hairs in the root tip of Arabidopsis. However, the molecular mechanisms that underlie root ABA signaling are largely unknown. We report here that hydrogen peroxide (H2O2) reduces the root growth of wild type, and the phenotype of H2O2 on the root growth is similar to ABA response. Meanwhile ABA-induced changes in the morphology of root system can be partly reversed by ascorbic acid in wild type and abolished in NADPH oxidase defective mutant atrbohF and atrbohC. Further, ABA can induce H2O2 accumulation in the root cells and enhance transcription level of OXI1, which is necessary for many more AOS-dependent processes such as root hair growth in Arabidopsis. Our results suggest that H2O2 as an important signal molecule is required for the ABA-regulated root growth and development in Arabidopsis.