摘要
外源调控作物耐盐是保证盐渍化土壤中农作物安全生产的重要措施.新型植物源天然化合物麝香草酚作为一种医药活性物质已有大量报道,但其对植物的生理调控活性却鲜有报道.本文以水稻幼苗为研究材料,通过植物生理学、组织化学、生物化学等手段,探讨了麝香草酚调控水稻抗盐胁迫的作用方式.结果显示:(1)外源麝香草酚处理能够显著缓解盐胁迫对水稻幼苗根的抑制,并呈现出一定的浓度效应;(2)外源麝香草酚处理显著缓解了盐胁迫诱导的根尖细胞死亡效应;(3)外源麝香草酚处理有效清除了盐胁迫诱导根尖过量累积的过氧化氢和超氧阴离子;(4)盐胁迫显著抑制根尖超氧化合物歧化酶(SOD)和过氧化氢酶(CAT)活性,而添加麝香草酚则显著提升了盐胁迫下这两种抗氧化酶的活力;(5)外源麝香草酚处理显著提高了盐胁迫下根尖抗坏血酸(As A)和谷胱甘肽(GSH)的含量.这些结果表明,麝香草酚能够通过提升水稻幼苗根尖的抗氧化能力,抵御盐胁迫诱导的氧化损伤和细胞死亡效应.本研究对盐渍化土壤中水稻的安全生产提供了重要的科学依据和技术手段.
Exogenous regulation of salt tolerance is an important approach for the safety of crop production in salinity soil. Thymol is a novel plant-derived natural compound, which has been extensively reported to have medicinal activity. However,the regulation of plant physiology by thymol is still elusive. In the present study,physiological,histochemical,and biochemical methods were used to investigate thymol -modulated salt tolerance in rice seedlings. Basically, the results showed that, （ 1） Exogenous treatment with thymol significantly attenuated salt-induced root inhibition in a dose-dependent manner. （ 2） Exogenous treatment with thymol remarkably blocked salt-induced cell death in root tip. （ 3 ） Exogenous treatment with thymol scavenged the over-generated hydrogen peroxide and superoxide radical in root tip under salt stress.（4）Salt stress significantly inhibited the activity of superoxide dismutase（SOD）and catalase（CAT）in root tip,while thymol treatment pronouncedly enhance the activity of these two anti-oxidative enzymes under salt stress.（5） Exogenous treatment with thymol induced significant increase in the content of ascorbic acid（AsA） and glutathione（ GSH） in root tip under salt stress. These results suggested that thymol was capable of conferring salt-induced oxidative injury and cell death by enhancing the anti-oxidative capacity in the root tip of rice seedlings. The current study provides important technological and scientific basis to ensure the safety of crop production in salinity soil.
出处
《南京师大学报（自然科学版）》
CAS
CSCD
北大核心
2017年第2期57-64,共8页
Journal of Nanjing Normal University(Natural Science Edition)
基金
江苏省农业科技自主创新基金项目[CX(14)2096]
关键词
水稻
麝香草酚
盐胁迫
活性氧
细胞死亡
rice, thymol, salt stress, reactive oxygen species,cell death
