干旱胁迫对银柴胡生长及生理生化特性的影响(4)
6.Key Laboratory of Hui Medicine Modernization， Ministry of Education， Yinchuan 750004， China；
7.Ningxia Medicine Research Institute， Yinchuan 750004， China)
[Abstract] A pot experiment was conducted to study effect of drought stress on leaf physiological characteristics and growth of one year old Stellaria dichotoma seedlings. The result showed that plant height and shoot dry weight significantly decreased with decrease in soil water content；however， root length and root dry weight increased at light drought stress and decreased at severe drought stress. The result also showed that with the decrease of soil water content， proline content in S. dichotoma leaves decreased then increase， while solube protein content decreased. Activities of SOD and POD in S. dichotoma leaves significantly decreased as soil water content decreased， while activity of CAT significanlty decreased at severe drought stress. Membrane permeability in S. dichotoma leaves increased， while MDA content decreased then increased as soil water decreased. These results suggest that S. dichotoma had osmotic stress resistance ability and reactive oxygen scavenging capacity at light drought stress， which caused S. dichotoma growth was no inhibited at a certain extent drought stress.
[Key words] Stellaria dichotoma； drought stress； growth； protective enzyme； membrane lipid peroxidation
doi：10.4268/cjcmm20141109
[责任编辑 吕冬梅], 百拇医药(郎多勇 崔佳佳 周达 李月彤 周丽 张新慧)
7.Ningxia Medicine Research Institute， Yinchuan 750004， China)
[Abstract] A pot experiment was conducted to study effect of drought stress on leaf physiological characteristics and growth of one year old Stellaria dichotoma seedlings. The result showed that plant height and shoot dry weight significantly decreased with decrease in soil water content；however， root length and root dry weight increased at light drought stress and decreased at severe drought stress. The result also showed that with the decrease of soil water content， proline content in S. dichotoma leaves decreased then increase， while solube protein content decreased. Activities of SOD and POD in S. dichotoma leaves significantly decreased as soil water content decreased， while activity of CAT significanlty decreased at severe drought stress. Membrane permeability in S. dichotoma leaves increased， while MDA content decreased then increased as soil water decreased. These results suggest that S. dichotoma had osmotic stress resistance ability and reactive oxygen scavenging capacity at light drought stress， which caused S. dichotoma growth was no inhibited at a certain extent drought stress.
[Key words] Stellaria dichotoma； drought stress； growth； protective enzyme； membrane lipid peroxidation
doi：10.4268/cjcmm20141109
[责任编辑 吕冬梅], 百拇医药(郎多勇 崔佳佳 周达 李月彤 周丽 张新慧)