...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Experimental Botany >A GH3 family member, OsGH3-2, modulates auxin and abscisic acid levels and differentially affects drought and cold tolerance in rice
【24h】

A GH3 family member, OsGH3-2, modulates auxin and abscisic acid levels and differentially affects drought and cold tolerance in rice

机译：GH3家族成员OsGH3-2调节植物生长素和脱落酸的水平，并差异地影响水稻的干旱和耐寒性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Plant responses to abiotic stresses are coordinated by arrays of growth and developmental processes. Indole-3-acetic acid (IAA) and abscisic acid (ABA) play critical roles in developmental programmes and environmental responses, respectively, through complex signalling and metabolism networks. However, crosstalk between the two phytohormones in the stress responses remains largely unknown. Here, it is reported that a GH3 family gene, OsGH3-2, encoding an enzyme catalysing IAA conjugation to amino acids, is involved in the modulation of ABA level and stress tolerance. Expression of OsGH3-2 was induced by drought but was suppressed by cold. Overexpression of OsGH3-2 in rice caused significant morphological aberrations related to IAA deficiency, such as dwarfism, smaller leaves, and fewer crown roots and root hairs. The overexpressing line showed significantly reduced carotene, ABA, and free IAA levels, greater stomata aperture, and faster water loss, and was hypersensitive to drought stress. However, the overexpressing line showed increased cold tolerance, which was due to the combined effects of reduced free IAA content, alleviated oxidative damage, and decreased membrane penetrability. Furthermore, expression levels of some ABA synthesis- and stress-related genes were significantly changed in the overexpression line. It was conclude that OsGH3-2 modulates both endogenous free IAA and ABA homeostasis and differentially affects drought and cold tolerance in rice.
机译：植物对非生物胁迫的反应通过一系列生长和发育过程来协调。吲哚-3-乙酸（IAA）和脱落酸（ABA）通过复杂的信号传导和代谢网络分别在发育计划和环境响应中发挥关键作用。然而，在应激反应中两种植物激素之间的串扰仍然是未知的。在此，据报道，编码催化IAA与氨基酸结合的酶的GH3家族基因OsGH3-2参与了ABA水平和胁迫耐受性的调节。 OsGH3-2的表达受干旱诱导，但受寒冷抑制。水稻中OsGH3-2的过表达导致与IAA缺乏相关的显着形态异常，例如侏儒症，较小的叶片以及较少的冠根和根毛。过表达谱系显示胡萝卜素，ABA和游离IAA含量显着降低，气孔孔径更大，失水更快，并且对干旱胁迫高度敏感。然而，过表达系显示出增加的耐寒性，这归因于降低的游离IAA含量，减轻的氧化损伤和降低的膜渗透性的综合作用。此外，一些ABA合成和应激相关基因的表达水平在过表达系中发生了显着变化。结论是OsGH3-2调节内源性游离IAA和ABA稳态，并差异影响水稻的干旱和耐寒性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号