乙烯利缓解盐胁迫对水稻幼苗根系的伤害
Ethephon Alleviates the Damage of Salt Stress to Rice Seedling Roots
母德伟 1冯乃杰 2郑殿峰 2周行 1余明龙 1陈观杰1
作者信息
- 1. 广东海洋大学滨海农业学院,湛江,524088
- 2. 广东海洋大学滨海农业学院,湛江,524088;广东海洋大学深圳研究院,深圳,518108
- 折叠
摘要
为探讨盐胁迫下外源乙烯利对水稻幼苗根系生长的调控效应,以耐盐品种'双优2088'和盐敏感品种'IR29'为试料,采用沙培方式研究不同浓度乙烯利(ETH)(0,50和500 mg/L)浸种对盐胁迫条件下(0,3和6 g/LNaCl)水稻幼苗根系形态建成以及生理特性的影响.结果表明,不同浓度ETH(0,50和500 mg/L)浸种能够促进盐胁迫下水稻幼苗根系的生长,显著增加两个水稻品种的根干重、根系总长度、根系总表面积、根总体积,并增加了根系抗氧化酶活性(SOD,APX,CAT),提高渗透调节物质(可溶性蛋白和脯氨酸)的含量,降低丙二醛(MDA)含量.分析表明,盐胁迫下,ETH主要通过增加'IR29'的CAT活性和'双优2088'的APX活性,来降低MDA含量,缓解盐胁迫带来的氧化伤害,促进水稻根系的生长和发育.综合分析调控效果50 mg/L ETH＞500 mg/L ETH.说明ETH可作为一种有效的水稻浸种剂,缓解盐胁迫对水稻幼苗生长的抑制作用.本研究为提高水稻的耐盐性提供了简单、有效的方法.
Abstract
In order to study the regulation effect of exogenous ethephon on the root growth of rice seedlings under salt stress,the effects of different concentrations of ethephon(0,50 and 500 mg/L)on the root morphology and physiological characteristics of rice seedlings under salt stress(0,3 and 6 g/L NaCl)were studied by sand culture with salt tolerant variety'Shuangyou2088'and salt sensitive variety'IR29'.The results show that ETH in different concentrations(0,50 and 500 mg/L)seed soaking can promote the root growth of rice seedlings under salt stress,and significantly increase the root dry weight,total root length,total surface area,total root volume and root-shoot ratio of two rice varieties;increase the activity of root antioxidant enzymes(SOD,APX,CAT),improve the con-tent of osmotic regulating substances(soluble protein and proline),and reduce MDA content.The results showed that ETH decreased MDA content,alleviated oxidative damage caused by salt stress and promoted the growth and development of rice root system by increasing CAT activity of'IR29'and APX activity of'Shuangyou 2088'.The control effect was 50 mg/L ETH＞500 mg/L ETH.These results showed that ETH could be used as an effective rice seed soaking agent to alleviate the inhibition of salt stress on the growth of rice seedlings.This study provides a simple and effective method for improving the salt tolerance of rice.
关键词
水稻/盐胁迫/乙烯利/生理特性Key words
Rice/Salt stress/Ethephon/Physiological characteristics引用本文复制引用
基金项目
广东海洋大学科研启动项目(R20046)
广东海洋大学科研启动项目(060302052012)
广东海洋大学创新强校工程项目(230420006)
广东省重点领域研发计划项目(2020B020219004)
出版年
2024
NETL
NSTL
万方数据