Alternation in Lipid Composition of Wheat Leaves Induced by Phosphate Deficiency Is Related to Both Lipid Biosynthesis and Phosphatidylglycerol Degradation  

作　　者：YANGWen FENGFu-Ying HOUHai-Tong JIANGGui-Zhen XUYi-Nong KUANGTing-Yun 

机构地区：[1]KeyLaboratoryofPhotosynthesisBeijing100093,China

出　　处：《Acta Botanica Sinica》2004年第2期211-215,共5页Acta Botanica Sinica（植物学报：英文版）

摘　　要：In this study, the causes of the changes in lipid composition induced by different phosphatenutrient levels were investigated. Wheat plants were grown in phosphate-deficient and phosphate-suffcient conditions, respectively, and lipid compositions in the leaves of 9-day-old and 16-day-old plants wereanalyzed. We found that phosphate deficiency induced a dramatic change at the lipid levels in photosyntheticmembranes of wheat leaves and the extent of changes in lipid composition depended on the leaf ages.Phosphate deficiency induced a gradual decrease in PG and MGDG and a concomitant increase in DGDGand SQDG from the first leaf to the second and the third leaf on 16-day-old plants. In addition, as comparedto leaves grown under phosphate sufficient solution, PG content in the first leaf of 16-day-old plants wassignificantly lower than that of 9-day-old leaf with 2.5 mol% versus 5.5 mol% when these plants were grownunder phosphate deficient condition. From these results, it is suggested that the alternation in lipidcomposition in wheat leaves induced by phosphate deficiency is related to both lipid biosynthesis and PGdegradation. PG decrease in younger leaves is mainly due to insufficient phosphate supply for PG biosynthesis,while PG degradation mainly resulted in the PG decrease in older leaves.

关 键 词：磷脂酰甘油 降解 脂 合成 磷转移 磷缺失 小麦 叶片 

分 类 号：S512.101[农业科学—作物学] Q945.1[生物学—植物学]