亚热带农业研究2024，Vol.20Issue(2)：93-101,9.DOI:10.13321/j.cnki.subtrop.agric.res.2024.02.003
PEG胁迫下不同抗旱性油菜品种的生理特性及其响应机制
Physiological characteristics and response mechanisms of different drought-resistant rapeseed varieties under PEG stress
摘要
Abstract
[Purpose]To compare four different drought-resistant rapeseed varieties under drought stress using physiological indi-ces,to further elucidate the physiological mechanism of drought resistance in rapeseed.[Method]Four different varieties of rape-seed with different drought resistance were subjected to simulated drought stress with polyethylene glycol(PEG-6000)at a mass fraction of 5％and treated with an equal amount of distilled water as control(CK).The effects of drought stress on growth and de-velopment,antioxidant enzyme activity,and the osmotic-regulating substances of rapeseed seedlings were analyzed using petri dish experiments.[Result]Rapeseed growth and development were inhibited under drought stress.Compared with CK,the germination rate and vigor of strongly drought-resistant varieties(Qingza 4 and Zheyouza 1)showed no significant changes,while those of the weakly drought-resistant varieties(Xinyou 25 and Nongjia Ziyong 22)significantly decreased compared to the CK treatment.In ad-dition,the antioxidant enzyme activities(SOD,POD,CAT,and APX)of strongly drought-resistant varieties were significantly higher than those of weakly drought-resistant varieties.Under drought stress,the contents of hydrogen peroxide,superoxide anion,and MDA as well as conductivity were significantly lower in strongly drought-resistant varieties than those in weakly drought-resistant varieties,while the soluble sugar content in strongly drought-resistant varieties was significantly higher than that in weakly drought-resistant varieties.[Conclusion]Under drought stress,the difference between strongly and weakly drought-resistant varieties was due to the stronger ROS scavenging ability of the antioxidant system and higher levels of positive hormones and osmotic regulatory substances in the strongly drought-resistant varieties.This physiological mechanism enhances drought resistance in rapeseed seedlings.关键词
油菜/种子萌发/干旱胁迫/抗氧化酶活性Key words
rapeseed/seed germination/drought stress/antioxidant enzyme activity分类
农业科技引用本文复制引用
黄加煌,孟奕岙,宋雪蕊,郭春林,秦彬..PEG胁迫下不同抗旱性油菜品种的生理特性及其响应机制[J].亚热带农业研究,2024,20(2):93-101,9.基金项目
闽台作物种质资源创制与绿色应用协同创新中心项目. （）
