干旱胁迫对黄芩幼苗保护酶活性的影响

Effects of Drought Stress on Protective Enzymes Activities of Scutellaria baicalensis Seedlings

为探索陕西黄芩抵御干旱的生理机制,采用水培的方法,用不同浓度的PEG-6000模拟不同干旱胁迫,通过测定黄芩幼苗叶片保护酶(SOD、POD、CAT)的活性,研究黄芩幼苗对干旱的响应。结果表明:伴随着干旱胁迫程度的加剧,3种酶活性均呈现为先升高后降低趋势,在PEG-6000浓度为7.5%达到最高,SOD活性为82.86U·g^(-1),CAT活性为42.06U·g^(-1),POD活性为9.37U·g^(-1)。表明适度的干旱胁迫能提高黄芩幼苗体内的保护酶活性。

In order to explore the physiological mechanism of Scutellaria to resist drought,in this study,the response of Scutellaria baicalensis seedlings to drought was studied by using different concentrations of PEG-6000to simulate different drought stress and to determine the activities of SOD,POD and CAT in the leaves of S.baicalensis seedlings.The results showed that with the intensification of drought stress,the activities of the three enzymes increased first and then decreased,the concentration of PEG-6000was7.5%,the activity of SOD was82.86U·g-1,the activity of CAT was42.06U·g-1,and POD activity was9.37U·g-1.Therefore,moderate drought stress could enhance the activities of protective enzymes in S.baicalensis seedlings.