干旱胁迫对3种宿根花卉生理生化指标的影响

以3种常见宿根花卉为材料,采用室内盆栽控水法测定叶片超氧化物歧化酶SOD活性、游离脯氨酸Pro、可溶性蛋白、可溶性糖、丙二醛MDA含量。研究表明,干旱胁迫至12d,千屈菜生长受严重抑制,婆婆纳、鼠尾草较轻。3种宿根花卉土壤容积含水量均呈下降趋势且幅度基本一致。鼠尾草SOD活性0~6d呈上升趋势且6d达最大值,6~12d呈下降趋势;婆婆纳、千屈菜SOD活性3d达最大值,随后呈下降趋势。3种宿根花卉Pro含量随干旱胁迫均呈上升趋势;可溶性蛋白、可溶性糖含量随干旱胁迫呈先上升后下降趋势;婆婆纳和鼠尾草随干旱胁迫叶片MDA含量增加,千屈菜则呈先升高后降低趋势。通过隶属函数综合评价,3种宿根花卉抗旱性强弱为:鼠尾草>婆婆纳>千屈菜。

Effects of Drought Stress on Physiological and Biochemical Indices of Three Species Perennial Flowers

Seedlings of three commonly occurred perennial flowers were used as test materials that were potted cultured indoors under different water levels to study the effects of drought stress on their physiological and biochemical indices,such as the activity of leaf SOD,the content of proline,soluble protein,soluble sugar,and MDA content.The results showed that when drought stress lasted 12 days,the growth of Lythrum salicaria was severely inhibited.At the same time,the growth of Veronica incana and Salvia japonica were less affected by the drought stress.The volumetric water content of the soils of three perennial flowers showed a similar decline trend.The SOD activity of S.japonica increased firstly at 0-6 d and reached the maximum at 6d,showing a downward trend during the 6-12 d.The SOD activity of the V.incana and the L.salicaria reached a maximum at 3 d,and then showed a downward trend.The content of proline of three kinds of perennial flowers increased with drought stress.The content of soluble protein and soluble sugar increased first,and then decreased with drought stress.The contents of MDA in the leaves of V.incana and S.japonica increased with the drought stress,and for L.salicaria ,it increased first,and then decreased with drought stress.It was concluded that the drought resistance ability was in the order of S.japonica>V.incana>L.salicaria .