水分梯度下不同地理种群红砂叶片生理特征比较研究

Comparison of Leaves' Physiological Characters of Reaumuria soongorica in Different Geographical Population under Water Gradient

选取甘肃省不同地域的天然红砂种群进行叶片生理生化指标比较分析研究。结果表明:自东向西水分梯度递减条件下,不同地理种群叶片膜脂过氧化产物MDA含量增多,同时伴随着超氧物自由基(O2-.)的产生速率提高,相应诱导了SOD、POD和CAT酶活性升高,渗透调节物质脯氨酸和可溶性糖含量增加,但酒泉点SOD、POD和CAT酶活性均有降低的趋势;除武威点外,其余各样点红砂叶片叶绿素a、叶绿素b含量相差均不大。

The physiological and biochemical indices of leaves of Reaumuria soongorica in different geo- graphical populations in Gansu region are investigated and comparatively analyzed. Along with the decreasing water gradient from east to west in Gansu, the activities of superoxide dismutase （SOD）, peroxidase （POD） and catalase （CAT） increase, the contents of malondialdehyde （MDA） and osmoregulatory substances such as free-proline and soluble sugar increase, and the O2- production rate increase, but the contents Chlorophyll-a and Chlorophyll-b change indistinctively. There are two exceptions, the activities of superoxide dismutase （SOD）, peroxidase （POD） and catalase（CAT） decrease in Jiuquan, the contents of Chlorophyll-a and Chlorophyll-b are smaller in Wuwei.