钙素对雾培马铃薯幼苗抗冷性的影响分析

Effect Analysis of Calcium on Cold Resistance of Aeroponic Potato Seedlings

针对雾培马铃薯幼苗根系器官常受气温影响而导致植株生育不良的生产实际,试验探讨了增施钙素对低温环境下雾培马铃薯幼苗抗冷性的调节作用,以期为低温生产季节增施钙素来增强马铃薯幼苗抗冷性提供依据。试验结果表明,增施钙素可以降低马铃薯幼苗叶片的离子渗透率和膜脂过氧化产物丙二醛(MDA)的积累量,同时还能有效提高叶片中抗氧化保护酶(POD、CAT和SOD)活性和渗透调节物质(可溶性蛋白质和可溶性糖)的含量以及抑制幼苗根系活力的下降,但增施钙素未能显著提高幼苗叶片中脯氨酸的含量。以上结果说明,钙素在雾培马铃薯幼苗抵御冷害的生理调节过程中发挥了重要作用,通过增施适宜浓度的钙素在一定程度上可以改善雾培马铃薯幼苗的抗冷性。

The growth of aeroponic potato seedlings is sensitive to the ambient temperature as the roots are exposed to the air during cultivation.Effects of exogenous calcium treatment on physiological indexes of potato seedlings were studied in order to provide basis for improving the cold resistance by applying calcium reasonably in the low temperature production season.The results showed that the electrolyte leakage and MDA content in leaves of potato seedlings with calcium treatment were decreased,compared with the control,the activities of anti-oxidant enzymes（POD、CAT and SOD） in leaves were improved and the contents of osmotic adjustment substances（soluble sugar and soluble protein） in seedlings leaves were increased,however,the effect of calcium application on praline content in leaves was not obvious.Furthermore,calcium treatment could efficiently restrain the root activity drop of potato seedlings.The results above indicated that the calcium signaling was closely related to the physiological regulation of aeroponic potato seedlings in the low temperature condition,calcium application with appropriate concentration could improve the cold resistance of seedlings.