黑果枸杞根系对干旱胁迫响应的生理机制
张金菊 , 田青 , 郭有燕 , 张惠云 , 包新光 , 孔东升 , 杜军林
甘肃农业大学学报 ›› 2023, Vol. 58 ›› Issue (04) : 183 -191.
黑果枸杞根系对干旱胁迫响应的生理机制
Physiological mechanism of root response to drought stress in Lycium ruthenicum
目的 探讨黑果枸杞幼苗根系生理生化对干旱胁迫的响应机制,为今后黑果枸杞的培育管护和种群繁殖提供科学理论依据。 方法 以盆栽黑果枸杞幼苗为研究对象,采用控水法,比较不同胁迫时间段黑果枸杞幼苗根系活力、脯氨酸、丙二醛(MDA)、可溶性糖、可溶性蛋白的含量和抗氧化酶(SOD、POD、CAT)的活性变化,分析黑果枸杞幼苗根系生理生化对干旱胁迫的响应。 结果 随胁迫时间的延长,黑果枸杞幼苗根系活力呈先增加后减小的变化趋势;MDA含量显著上升(P<0.05);根系脯氨酸、可溶性糖和可溶性蛋白含量均呈逐渐增加的变化趋势,且脯氨酸含量增加最快;SOD、POD和CAT的活性呈现先增后降的变化趋势,但几种抗氧化酶活性增加和降低的时间节点不一致。 结论 黑果枸杞幼苗在受到干旱胁迫时,根系通过大量积累渗透调节物质含量来降低渗透势,同时根系多种保护酶相互协同,降低膜脂过氧化程度带来的损害,从而提高黑果枸杞幼苗的抗旱性。
Objective To investigate the physiological and biochemical response mechanism of the root system of Lycium ruthenicum seedlings to drought stress,and to provide a scientific theoretical basis for the future cultivation,management and propagation of L.ruthenicum seedlings. Method Taking potted black fruit L.ruthenicum seedlings as the research object,the water control method was adopted,comparing root activity,proline,malondialdehyde (MDA),soluble sugar,soluble protein contents and antioxidant enzymes (SOD,POD,CAT) activities in seedlings under different stress periods,to analyze the physiological and biochemical responses of roots of seedlings to drought stress. Result With the prolongation of the stress time,the root vigor of seedlings first increased and then decreased.MDA content increased significantly (P<0.05).The content of proline,soluble sugar and soluble protein in the roots showed a gradually increasing trend,and the content of proline increased the fastest.The activity of SOD,POD and CAT showed a trend of first increasing and then decreasing,but the time points of increasing and decreasing activities of several antioxidant enzymes were not consistent. Conclusion Under drought stress,the root system of L.ruthenicum seedlings reduces the osmotic potential by accumulating a large amount of osmotic regulators,and at the same time,a variety of protective enzymes in the root system cooperate to reduce the damage.Caused by the degree of membrane lipid peroxidation,thereby improving the drought resistance of wolfberry seedlings.
Lycium ruthenicum / physiological and biochemical / drought stress / root system
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国家自然科学基金项目(32060334)
教育厅产业项目(2021CYZC-56)
甘肃省高等学校创新基金项目(2021A-122)
2022年度中央引导地方科技发展资金项目(22ZY2QG001)
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