干旱胁迫对元宝枫生理活性的影响

Effects of Drought Stress on Physiological Activities of Acer truncatum

为给榆林沙区造林及丰产栽培提供理论依据和实践指导,利用1a生元宝枫盆栽幼苗,设置极轻度(土壤最大持水量75%~80%)、轻度(土壤最大持水量55%~60%)、中度(土壤最大持水量35%~40%)、重度(土壤最大持水量15%~20%)等4个干旱胁迫水分条件梯度,研究分析了元宝枫幼苗在不同程度干旱条件下,其叶片的丙二醛(MDA)、超氧化物歧化酶(SOD)、过氧化物歧化酶(POD)、过氧化氢酶(CAT)等指标在短期干旱时的变化。结果显示:元宝枫幼苗在不同的干旱程度下,MDA、SOD、POD和CAT的含量或活性值不同,且随着干旱时间的短期持续,也有着不同的变化趋势,特别是在重度干旱情况下,其各项数值的变化幅度更大。元宝枫是榆林地区计划发展树种,分析其在干旱条件下生理活性的变化,对于掌握其干旱适应性能,合理造林具有指导意义。

This study analyzed the changes of malondialdehyde(MDA), superoxide dismutase(SOD), peroxide dismutase(POD) and catalase(CAT) in the leaves of Acer truncatum seedlings under different degrees of drought( 75%~80%, 55%~60%, 35%~40% and 15%~20% of maximum water holding capacity of soil, respectively). The results showed that the contents or activities of MDA, SOD, POD and CAT in Acer truncatum seedlings were different under different drought degrees, and had different change trends with the short-term duration of drought, especially in the case of severe drought. Acer truncatum is a planned tree species in Yulin area and analysis of its physiological activity under drought conditions is of significance in mastering its drought adaptability and rational afforestation.