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对玉米种子萌发过程中低温冷袭 ( 3.0℃ )下幼苗电导率、硝酸还原酶活性、可溶性蛋白质含量、可溶性糖、蔗糖含量、植株浸出液中K+、Mg2 +和Ca2 +含量以及株高、干重、鲜重和残留种子干物质重量的研究结果表明 ,冷袭处理植株较对照植株的高度、干重和鲜重的生长率均随叶龄和天龄的增加而降低 ,可溶性蛋白质含量、可溶性糖含量均随叶龄和天龄的增加而呈下降趋势 ;而相对电导率和植株浸出液中的K+、Mg2 +和Ca2 +含量则呈上升趋势 ,从而说明玉米幼苗从异养向自养转变的过程中 ,抵御冷袭的能力是逐渐降低的 ,也就是说对冷袭的敏感性是逐渐增大的。从冷袭处理植株与对照植株之间各项指标的差值来看 ,均在 1 5天龄或 1 7天龄最大 ,说明此时期既离乳期 ,玉米幼苗对冷袭的敏感性最大
The seedling conductivity, nitrate reductase activity, soluble protein content, soluble sugar and sucrose content, K +, Mg2 + and Ca2 + contents in plant leachate and the plant height, dry weight The results of fresh weight and dry matter weight of residual seeds showed that the growth rate of height, dry weight and fresh weight of cold-treated plants decreased with the increase of leaf age and age. The contents of soluble protein, soluble sugar The contents of K +, Mg2 + and Ca2 + in the relative conductivity and plant leachate tended to increase with the increase of leaf age and age, which indicated that the process of transformation from heterotrophic to autotrophic , The ability to resist cold attacks is gradually reduced, that is to say the sensitivity to cold attacks is gradually increasing. From the difference between the index of cold stress and that of the control plants, all of them were at the age of 15 days or 17 days, indicating that the period of this period was both the period of lactation and the sensitivity of the corn seedlings to cold attack