亚低温与干旱胁迫对番茄幼苗渗透调节物质与抗氧化酶活性的影响

以"金棚1号"番茄为试材,采用温室盆栽的方法研究亚低温与干旱胁迫对番茄幼苗渗透调节物质与抗氧化酶活性的影响。结果表明,随着亚低温干旱交互胁迫时间的延长,番茄幼苗叶片MDA含量、细胞膜相对透性均有不同程度的升高,可溶性蛋白含量、SOD活性变化趋势出现先升后降,POD活性呈现倒"V"型变化,CAT活性呈现"M"型变化,番茄幼苗叶片对亚低温胁迫的敏感程度大于干旱胁迫的影响。相关性分析与主成分分析显示:POD、CAT活性与细胞膜相对透性呈极显著负相关,与MDA含量呈显著负相关;SOD活性与MDA含量呈正相关,POD与CAT活性呈显著正相关。

Effects of sub-low temperature and drought stress on osmotic substances and activities of antioxidant enzymes in tomato seedling

With potted tomato plants in greenhouse as the experiment material,we investigated the influence of sub-low temperature and drought stress on osmotic substances and activities of antioxidant enzymes in tomato seedling.The results showed that with the interaction of sub-low temperature and drought stress treatment time prolong,MDA content、relative membrane conductivity in leaves of tomato seedling increased,soluble protein content and SOD activities first increased and then decreased gradually with the prolong of treatment time.The change of POD activities showed inverted "V"pattern and POD activities showed "M"pattern,Tomato seedling of sub-low temperature is greater sensitivity than drought stress.The correlation analysis and Principal component analysis indicated that POD、CAT was significantly positively negatively correlated to relative membrane conductivity,positively negatively correlated to MDA content;SOD was related to MDA,POD and CAT was significantly positively related.