黑暗和光照条件下低温胁迫对红花玉兰幼苗生理特性的影响

The Effect of Low Temperature Stress on Physiological Characteristics of Magnolia wufengensis Seedlings under the Dark and Light Conditions

以25℃正常生长的苗木为对照,研究了在黑暗和光照条件下低温(5℃)胁迫对红花玉兰幼苗生理特性的影响,结果表明:低温胁迫下,质膜相对透性升高,可溶性糖及脯氨酸含量增加,且光照处理高于黑暗处理;可溶性蛋白含量下降,且光照处理的含量小于黑暗处理;SOD活性升高,且光照处理高于黑暗处理;光照处理POD活性升高较小,黑暗处理POD活性低于对照。可溶性糖含量、脯氨酸含量、SOD活性的提高可能是植株抗寒性机制的重要因子。

The effect of low temperature stress on physiological characteristics of Magnolia wufengensis seedlings under the dark and light conditions was studied by taking the normal seedling grew at 25℃ as the control. The results showed： the plasma membrane relative permeability increased, the contents of soluble sugar and prohne increased, and those with illumination treatment were higher than those with the dark treatment. Nevertheless the content of soluble protein decreased, those with illumination treatment were lower than those with the dark treatment; the activity of SOD increased, and those with illumination treatment were higher than those with the dark treatment; The activity of POD increased by a small amount with illumination treatment, the activity of POD was lower than that of the control with dark treatment. The increases of the contents of soluble sugar, proline and the activity of SOD might play an important role in chilling resistance system of the plant.