外源褪黑素缓解番茄钠碱性胁迫需要一氧化氮作为下游信号。

Sodic alkaline stress mitigation by exogenous melatonin in tomato needs nitric oxide as a downstream signal.

作者信息

Liu Na, Gong Biao, Jin Zhiyong, Wang Xiufeng, Wei Min, Yang Fengjuan, Li Yan, Shi Qinghua

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, PR China; College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an 271018, PR China.

出版信息

J Plant Physiol. 2015 Aug 15;186-187:68-77. doi: 10.1016/j.jplph.2015.07.012. Epub 2015 Aug 28.

DOI:10.1016/j.jplph.2015.07.012

PMID:26412100

Abstract

The present study was designed to determine the interactive effect of exogenous melatonin and nitric oxide (NO) on sodic alkaline stress mitigation in tomato seedlings. It was observed that exogenous melatonin treatment elevated NO levels in alkaline-stressed tomato roots. However, exogenous NO had little effects on melatonin levels. Importantly, melatonin-induced NO generation was accompanied by increased tolerance to alkaline stress. Chemical scavenging of NO reduced melatonin-induced alkaline stress tolerance and defense genes' expression. However, inhibition of melatonin biosynthesis had a little effect on NO-induced alkaline stress tolerance. These results strongly suggest that NO, acting as a downstream signal, is involved in the melatonin-induced tomato tolerance to alkaline stress. This process creates a new signaling pathway for improving stress tolerance in plant.

摘要

本研究旨在确定外源褪黑素和一氧化氮（NO）对缓解番茄幼苗碱性胁迫的交互作用。研究发现，外源褪黑素处理可提高碱性胁迫下番茄根中的NO水平。然而，外源NO对褪黑素水平影响较小。重要的是，褪黑素诱导的NO生成伴随着对碱性胁迫耐受性的增强。化学清除NO降低了褪黑素诱导的碱性胁迫耐受性和防御基因的表达。然而，抑制褪黑素生物合成对NO诱导的碱性胁迫耐受性影响较小。这些结果有力地表明，NO作为下游信号，参与了褪黑素诱导的番茄对碱性胁迫的耐受性。这一过程为提高植物胁迫耐受性创造了一条新的信号通路。