摘要
杂交稻幼苗经聚乙二醇（ＰＥＧ_（４０００））渗透胁迫（－０．９５ＭＰａ）处理，幼苗含水量及相对含水量下降，游离脯氨酸和膜脂过氧化产物丙二醛（ＭＤＡ）含量上升，质膜透性增大。随ＰＥＧ渗透胁迫时间延长，幼苗膜脂饱和脂肪酸含量逐渐增加，不饱和脂肪酸含量降低，不饱和脂肪酸指数（ＩＵＦＡ）减少。脯氨酸累积与ＭＤＡ增长及膜透性加大呈正相关性，与膜脂脂肪酸不饱和度呈负相关性。讨论了游离脯氨酸累积与细胞透性的相关性，以及与渗透调节作用的关系。
Seedlings of hybrid rice(Oryza sativa subsp. indica cv, Weiyou 287 , Shanyou 287,Shanyou 63)were osmotic stress with polyethyleneglycol (PEG4000). The water content and relative water content of the rice seedlings were gradually decreased under osmotic stress(-0.95MPa), content of free proline and malondialdehyde(MDA)and permeability of plasma membrane increased sharply; however, there was a positive correlation of content of free proline with the level of membrane-lipid peroxidation. The response of the different hybrid rice combinations to osmotic stress was different. The index of unsaturated fatty acid ( IUFA)in membrane lipids decreased treated by PEG.There was a negative relation between IUFA and content of free proline under osmotic stress.
出处
《武汉植物学研究》
CSCD
1996年第4期334-340,共7页
Journal of Wuhan Botanical Research
基金
湖南省教委资助
关键词
水稻
幼苗
渗透胁迫
膜脂过氧化
游离脯氨酸
Rice seedlings, Osmotic stress,Membrane-lipid peroxidation,Free proline,Index of unsaturated fatty acid(IUFA)
