摘要
在土壤干旱下抗旱性强的小麦品种的渗透调节能力大于抗旱性弱的品种。土壤缓慢干旱时,几种主要渗透调节物质增加的先后次序为:Pro,K^+,然后是可溶性糖和其他游离氨基酸,后两者几乎平行增加、在土壤干旱下的渗透调节物质中,有机溶质为可溶性糖、其他游离氨基酸、Pro和Mal;无机离子为K^+,Ca^(2+),Mg^(2+)等。对渗透调节的相对贡献率为:K^+>可溶性糖>其他游离氨基酸>Ca^(2+)>Mg^(2+)>Pro。六种物质总和对渗透调节的相对贡献率为:轻度干旱56％～70％;中度干旱70％～79％;严重干旱79％～88％。
Experimental result showed that the ability of osmotic adjustment of wheat cultivars with strong drought resistance was higher than that of wheat cultivars with weak drought resistance under soil drought. The increase of several main osmotica was in the order of Pro, K^+, soluble sugars and other free amino acids. The curves of the increase of soluble sugars and other free amino acids were almost parallel under slow soil drought. The organic solutes in osmotica were soluble sugars, other free amino acids, Pro and Mal, and the inorganic ions were K^+, Mg^(2+), Ca^(2+), and so on under soil drought. The relative contribution of osmotica to osmotic adjustment was in such order: K^+>soluble sugars>other free amino acids >Ca^(2+)> Mg^(2+)>Pro. Sum of the rclativc contribution of above six osmotica to osmotic adjustment was about 56%～70% for mild drought, about 70%～79% for moderate drought, and 79%～88% for severe drought.
关键词
小麦
土壤干旱
渗透调节
wheat
soil drought
osmotic adjustment
osmotica
