一氧化氮作为下游信号，在生长素诱导黄瓜耐盐碱胁迫中起着至关重要的作用。

Nitric oxide, as a downstream signal, plays vital role in auxin induced cucumber tolerance to sodic alkaline stress.

机构信息

State Key Laboratory of Crop Biology, Scientific Observing and Experimental Station of Environment Controlled Agricultural Engineering in Huang-Huai-Hai Region, Ministry of Agriculture, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an 271018, PR China.

Resources and Environment Department, Heze Univeristy, Heze 274015, PR China.

出版信息

Plant Physiol Biochem. 2014 Oct;83:258-66. doi: 10.1016/j.plaphy.2014.08.004. Epub 2014 Aug 16.

DOI:10.1016/j.plaphy.2014.08.004

PMID:25194776

Abstract

Nitric oxide (NO) and auxin (indole-3-acetic acid; IAA) play vital roles in regulating plants tolerance to abiotic stresses. This study showed that both NO and IAA could induce cucumber plants tolerance to sodic alkaline stress, which depended on their roles in regulating reactive oxygen species (ROS) scavenging, antioxidative enzymes activities, Na(+) accumulation and protecting photosystems II (PSII) from damage. In addition, IAA has significant effect on NO accumulation in cucumber root, which could be responsible for IAA-induced sodic alkaline stress tolerance. Further investigation indicated that the function of IAA could be abolished by NO scavenger (cPTIO). On the contrary, IAA transport inhibitor (NPA) showed no significant effects on abolishing the function of NO. Based on these results, it could be concluded that NO is an essential downstream signal for IAA-induced cucumber tolerance to sodic alkaline stress.

摘要

一氧化氮（NO）和生长素（吲哚-3-乙酸；IAA）在调节植物对非生物胁迫的耐受性方面发挥着重要作用。本研究表明，NO 和 IAA 均可诱导黄瓜植株耐受盐碱胁迫，这取决于它们在调节活性氧（ROS）清除、抗氧化酶活性、Na+积累和保护光系统 II（PSII）免受损伤方面的作用。此外，IAA 对黄瓜根中 NO 积累有显著影响，这可能是 IAA 诱导盐碱胁迫耐受性的原因。进一步的研究表明，NO 清除剂（cPTIO）可以消除 IAA 的功能。相反，NO 转运抑制剂（NPA）对消除 NO 的功能没有显著影响。基于这些结果，可以得出结论，NO 是 IAA 诱导黄瓜耐受盐碱胁迫的必需下游信号。