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渗透胁迫对玉米幼苗保护酶系统的影响及其与抗旱性的关系 预览 被引量:70

Effect of Osmotic Stress on Protective Enzyme Systems in Maize Seedlings and Their Relationship to Drought Resistance
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摘要 通过不同浓度(0,-0.75,-1.25,-2.00MPa)的PEG胁迫对不同抗旱性的玉米杂交种及其其亲本自交系幼苗保护酶活性,膜脂过氧化水平,质膜透性的影响及其与品种抗旱性关系的研究,明确了适度的PEG(-0.75,-1.25MPa)胁迫处理使玉米幼苗叶片的SOD,CAT,POD活性明显增高,MDA含量和质膜相对透性缓慢增加;重度PEG(-2.00MPa)胁迫处理使叶片的SOD,CTA活性降低, The effect of osmotic stress induced by PEG (0, -0.75, -1.25, -2.00MPa) on protective enzymes activities, membrane lipid peroxidation, permeability of plasma membrane of different drought-resistant maize (Zea mays L.) cultivars (droughtresistant: Ji-Dan No. 24 (F1) and its parental inbred lines: short 192. (♀) and Yellow Eatry No. 4 (♂) and drought-sensitive: Ye-Dan No. 4 (F1) and its parental inbred lines:8112 (♀) and yellow Early No. 4 (♂) and their relationship to drought resistance were studied. The results showed that the activities of superoxide dismutase (SOD), catatase (CAT), peroxidase (POD) were increased obviously, and the malondialdehyde (MDA) contents and permeability of plasma membrane increased slowly under appropriate osmotic stress. The activies of SOD, CAT decreased, MDAcontents and permeability of plasme membrane were increased obviously, and POD activities increased slowly under severe osmotic stress; SOD, CAT, POD activites of drought-resistant hybrid and its parental lines increased more than those of drought-sensitive hybrid and its parental lines, but MDA contents and permeability of plasma membrane of the formers were lower than those of the laters. It is suggested that keeping a higher level of protective enzymes activities might be one of the reasons which hybrid maize had stronger drought resistant ability.
作者 李广敏 唐连顺 商振清 池书敏 Li Guangmin; Tang Lianshun; Shang Zhenqing; Chi Shumin(Dept. of Agron., Agric. Unvi. of Hebei, Baoding, 071001, China)
出处 《河北农业大学学报》 CAS CSCD 北大核心 1994年第2期 1-5,共5页 Journal of Agricultural University of Hebei
关键词 渗透胁迫 玉米 保护酶系统 抗旱性 Osmotic stress Maize Protective enzyme systems Drought resistance
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