龙眼内源激素变化和花芽分化及大小年结果的关系

CHANGES IN ENDOGENOUS HORMONE CONTENTS IN RELATION TO FLOWER BUD DIFFERENTIATION AND ON-YEAR OR OFF-YEAR FRUITING OF LONGAN

摘要:

本文探讨了隔年结果的龙眼花芽和营养芽内源激素在成花过程中的作用及其与结果大小年的关系．结果表明：大年树的细胞分裂素ｉＰＡ明显地高于小年树，而ＧＡ和ＡＢＡ含量明显低于小年树，说明细胞分裂素有利于龙眼花芽分化，ＧＡ和ＡＢＡ不利于花芽分化．龙眼大年树细胞分裂素和赤霉素的比值显著高于小年树．外施ＰＰ３３３能促进花芽分化，具有缩短花序、提高着果率和增加产量的作用．

Abstract:

The paper reports the changes in endogenous hormones in buds of on-year and off-year trees of longan (Dimocarprs longana Lour. cv. Fuyan)during differentiation period. It was shown that isopentenyl adenine (iPA)content in flower buds of on-year tree was noticeably higher than that in vegetative buds of off-year tree, while the contents of GA and ABA were to the contrary. It indicated that iPA was advantagous, GA and ABA were unadvantagous to flower bud differentiation. The treatment of PP333 promotedthe flower bud differentiation, shortened the length of inflorescence and increased the yield of fruit.