Phenotype and mechanism analysis of plant dwarfing in pear regulated by abscisic acid  

作　　者：LIU Jian-long ZHANG Chen-xiao LI Tong-tong LIANG Cheng-lin YANG Ying-jie LI Ding-Li CUI Zhen-hua WANG Ran SONG Jian-kun 

机构地区：[1]College of Horticulture,Qingdao Agricultural University,Qingdao 266109,P.R.China [2]Haidu College,Qingdao Agricultural University,Laiyang 265200,P.R.China

出　　处：《Journal of Integrative Agriculture》2022年第5期1346-1356,共11页农业科学学报（英文版）

基　　金：funded by the National Key Research and Development Program of China(2018YFD1000100);the Agricultural Improved Variety Project Program of Shandong Province,China(2019LZGC008);the National Key Research and Development Program of China(2019YFD1001404-3)。

摘　　要：Close planting of dwarf varieties is currently the main cultivation direction for pear trees,and the screening of excellent dwarf varieties is an important goal for breeders.In this study,the dwarfing pear variety‘601D’and its vigorous mutant‘601T’were used to show their biological characteristics and further explore the dwarfing mechanism in‘601D’.The biological characteristics showed that‘601D’had a shorter internode length,a shorter and more compact tree body,thicker and broader leaves,lower stomata density,larger stomata size(dimension),and higher photosynthetic capacity.The biological characteristics of‘601T’showed notable contrasts.The results of endogenous hormone tests indicated that the contents of abscisic acid(ABA),ABA-glucosyl ester,and GA_(4) were higher in‘601D’,but the trans-zeatin content was lower.By transcriptomic analysis,significant differences were found in the biosynthetic and metabolic pathways of ABA.Related transcription factors such as bHLH,WRKY,and homeobox also participated in the regulation of plant dwarfing.We therefore examined three hormones with obvious differences with‘601T’,and found that only ABA could induce‘601T’to return to a dwarfing plant phenotype.Therefore,we conclude that the dwarfing of‘601D’is caused by an excessive accumulation of ABA.This study provides a new theoretical basis for breeding dwarf varieties.

关 键 词：DWARF PEAR PHENOTYPE abscisic acid transcriptomic analysis 

分 类 号：S661.2[农业科学—果树学]