紫花苜蓿的抗寒生理适应性研究

The study on physiological adaptability to cold resistance of alfalfa

通过对3个紫花苜蓿Medicago sativa品种根部可溶性糖、全氮、丙二醛(MDA)、游离脯氨酸和游离氨基酸含量动态变化进行分析,研究它们与苜蓿抗寒性之间的关系。结果表明,苜蓿根内可溶性糖、全氮、游离脯氨酸和游离氨基酸含量会在秋冬季升高,并在整个冬季保持较高水平,春季返青时下降,苜蓿根内MDA含量在秋季升高,并随晚秋气温进一步下降而降低。此外,各紫花苜蓿品种综合测定的参数说明,阿尔冈金抗寒性最强,金皇后次之,甘农3号最差。

The dynamic change of soluble sugar content, total nitrogen, malondialdehyde, free proline and free amino acid in root of three alfalfa （Medicago sativa） varieties were analyzed to find out their relationships with cold resistance of alfalfa. The results indicated that the content of soluble sugar, total nitrogen, free proline and free amino acid increased from late autumn and early winter, and kept higher level during the entire winter, then decreased in regreen time in the next spring, the content of malondialdehyde increased in autumn and decreased with the falling of temperature in late autumn. Moreover, the integrated determination parameters of all alfalfa varieties suggested that the cold-resistance of Algonquin was the best, Gold Empress took the second place, and Gannong No. 3 was the worst.