施用钼肥对酸性黄棕壤上冬小麦叶片膜脂肪酸及叶细胞超微结构的影响

采用盆栽试验并通过电子显微观察,研究了施用钼肥对分蘖末期冬小麦叶片膜脂肪酸及叶细胞超微结构的影响。结果表明,施钼后冬小麦叶片膜脂肪酸组成以亚麻酸为主,膜脂不饱和度增大,细胞器和膜结构比缺钼完整;缺钼植株膜结构的稳定性差并导致植株抗寒力降低是细胞出现冻害的最本质原因。

Effects of molybdenum application on fatty acids and mesophyll cell ultrastructure of winter wheat leaves

Pot culture experiment was conducted with acid yellow-brown earth to study the effects of molybdenum application on fatty acids and mesophyll cell ultrastructure of winter wheat leaves at late tiller stage. Among four main fatty acids, octadecadienoic acid and octadecatrienoic acid content of winter wheat leaves were increased dramatically while octadecenoic acid content was decreased by Mo application. There was no difference in hexadecanoic acid content between Mo-sufficiency and Mo-deficiency plant. Through the electron microscope,some differences between Mo-sufficiency and Mo-deficiency plant in the cell or the organelle were observed. The result showed as follows: Applied with molybdenum, the completeness of organelle(chloroplast,chondriosome,cell nucleus,etc.), and the stability of the cell membrane of the Mo-treated winter wheat leaves were better than those of Mo-deficiency plant; molybdenum application was beneficial to the stability and the completeness of mesophyll cell ultrastructure of winter wheat leaves.