Md CIb HLH1 modulates sugar metabolism and accumulation in apple fruits by coordinating carbohydrate synthesis and allocation  

作　　者：Jianqiang Yu Xiaolong Liu Wenyan Wang Lili Zhang Chukun Wang Quanyan Zhang Jiahui Wang Mengchi Du Lixia Sheng Dagang Hu 

机构地区：[1]College of Horticulture and Landscape Architecture,Yangzhou University,Yangzhou,Jiangsu 225009,China [2]National Research Center for Apple Engineering and Technology,College of Horticulture Science and Engineering,Shandong Agricultural University,Tai'an,Shandong 271018,China [3]College of Resources and Environment,Linyi University,Linyi,Shandong 276000,China

出　　处：《Horticultural Plant Journal》2025年第2期578-592,共15页园艺学报(英文版)

基　　金：supported by grants from the National Natural Science Foundation of China(Grant Nos.32122080,31972375);Shandong Province(Grant No.ZR2020YQ25)。

摘　　要：The content of soluble sugars is a vital parameter that indicates the quality of fleshy fruits such as apple(Malus domestica Borkh.).Studying the patterns of accumulation of soluble sugars and regulatory mechanisms associated with fruit development is crucial for breeding improved fruit varieties.Here,we report that MdCIbHLH1,a low temperature-induced b HLH transcription factor,inhibits the accumulation of soluble sugars by regulating sugar-metabolizing enzyme activities,photosynthetic performance,and the expression of sugar-related genes in developing apple fruits.MdCIbHLH1 inhibits MdFBP and MdPEPCK expression,thus blocking the conversion of acids to sugars in apple fruits.We also discovered that MdCIbHLH1 decreases the photosynthetic rate and carbohydrate accumulation in apple leaves.Our results suggest that soluble sugar accumulation in apple fruits is influenced by multiple factors,including metabolic status,photosynthesis,and carbohydrate allocation.MdCIbHLH1 is critically involved in controlling the accumulation of soluble sugars by coordinating carbohydrate synthesis and allocation,thus influencing sugar transport and its metabolism during the development of apple fruits.

关 键 词：Fruit quality APPLE BHLH Sugar metabolism and transportation Photosynthetic rates 

分 类 号：S661.1[农业科学—果树学]