‘翠冠梨’不同序位幼果的差异及与果实脱落的关系

打开文本图片集

中图分类号：S661.2 文献标志码：A 文章编号：1008-1038（2025）10-0032-05

DOI：10.19590/j.cnki.1008-1038.2025.10.006

Positional Differences of Fruits and Their Association with Fruit Abscission in‘Cuiguan’Pear

TAN Zhihao， TAO Shutian* （Pear Engineering Technology Research Center，Nanjing Agricultural University，Nanjing 21OO95， China）

Abstract： To investigate the physiological differences among‘Cuiguan’pear young fruits of diffrent positions and their relationship with fruit abscission，this study compared the tissue structure，endogenous hormone levels，and reactive oxygen metabolism characteristics of young fruits at13 days after full bloom，including abscising fruits.The results showed that low-position fruits had significantly higher individual fruit mass than high-position fruits.Abscising fruits exhibited a pronounced accumulation of abscisic acid（ABA），reaching 2.46 times the average level of normal fruits， while indole-3-acetic acid （IAA） remained at an intermediate level and gibberellicacid（GA3）showednosignificant difference.Inabscising fruits，hydrogen peroxide levels increased markedly，whereascatalase（CAT） activitywasthe lowest，indicatinga decline inantioxidant capacity. Microscopic observations revealed the formation of a distinct abscision layer and lignified structure at the fruit pedicel. Collectively，these findings suggest that fruit abscission in‘Cuiguan’pear was a result of multiple interacting factors，among which excessive ABA accumulation，changes in IAA levels，and reactive oxygen imbalance played key regulatory roles.This study elucidated the intrinsic link between fruit position and abscission in pear and provided a theoretical basis for the development and application of chemical thinning agents.

'eywords： Pear; abscission; fruit position; endogenous hormones; reactive oxygen metabolisr

梨（Pyrus spp.）是我国重要的果树种类，在南北各地广泛栽培。（剩余6692字）