<正>柑桔缺锌导致发生叶脉间缺绿症,喷施锌肥后此种症状即可消除。使用电镜研究了缺锌柑桔树叶片及喷施锌肥消除缺绿症后的叶片超微结构,发现缺锌叶细胞的主要特征是细胞质基质、内质网及核糖体稀少及叶绿体中包含有大的淀粉粒。喷施锌肥后可使细胞结构恢复正常,细胞质浓厚,叶绿体数量增加,并出现大量多种形态的粗面内质网,从而可改善氮素代谢,促进光合作用,增加产量,改良品质。

Oranges suffering from Zn-deficiency often result in chlo rosis in the intei’-veinal ateas of the leaf, and it can be eliminated by sprinkling zinc fertilizer After studying with an electronic microscope the ultrastructures of the orange leaves Iccking zinc and those sprinkled with zinc fertilizer, we discover. (1) The major characteristics of leaf calls of Zn-deficient plants are that the cytoplasm, the endoplasmic reticulum and the ribosomes are poor, and that there are generally big starch grains in the chloroplasts. (2) After the sprinkling of zinc fertilizer, the structure of leaf cells returns to normal; the [cytoplasm is rich, the amount of chloroplast increases, and a lot of rough endoplasmic rgticulum with various shapes in the cytoplasm can be found. Furthermore, the complented Zinc can promote the photosynthesis of Zn-def icient plants and improve their N-metabolism, so that the yield of the fruit can be increased and the quality improved