聚乙二醇和聚乙烯醇渗调处理对苜蓿幼苗抗冷害的影响  

Effect of Seed-Osmoregulation with Polyethyleneglycol(PEG)and Polyvinyl Alcohol(PVA)on Cold-Resistance of Seedling ofAlfalfa(Medicago sativa L)

作　　者：赵剑[1,2] 王俭荣 杨文杰[1,2] 

机构地区：[1]东北师范大学生命科学学院 [2]延边市第二中学

出　　处：《东北师大学报（自然科学版）》1998年第2期50-54,共5页Journal of Northeast Normal University(Natural Science Edition)

基　　金：吉林省科委农业开发项目

摘　　要：经聚乙二醇（ＰＥＧ）和聚乙烯醇（ＰＶＡ）渗调处理的苜蓿种子不但发芽率高于对照组，而且幼苗的抗冷害能力也得到提高．两种渗透调节剂提高了苜蓿幼苗子叶的过氧化物酶（ＰＯＤ）、过氧化氢酶（ＣＡＴ）和超氧物歧化酶（ＳＯＤ）的活性，降低了丙二醛（ＭＤＡ）的积累水平和电解质渗漏的程度，说明聚乙二醇和聚乙烯醇渗调处理不但可以缓解低温吸胀对种子的伤害，而且还提高了幼苗抗冷害能力．Cold-acclimatization of alfalfa seedlings in 4℃～6℃ pretreated with PEG and PVA, seed-osmoregulators was studied. Germination rate of alfalfa seeds osmoregulated with PEG and PVA was higher than that of the control. Osmoregulation with two osmoregulator increases the activities of peroxidase, catalase and superoxide dismutase in cotyledon and decreases the content of malondialdehyde and leakage of electrolyte of cotyledon. The experiment suggests osmoregulation with PEG and PVA not only reduce the damage of seeds during low temperature imbibition but also enhance the cold-resistance of seedling of alfala.

关 键 词：聚乙二醇 聚乙烯醇 渗调处理 苜蓿 幼苗 抗冷害 

分 类 号：S540.44[农业科学—作物学]