Decrement of Sugar Consumption in Rice Young Panicle Under High Temperature Aggravates Spikelet Number Reduction

作     者：WANG Yaliang ZHANG Yikai SHI Qinghua CHEN Huizhe XIANG Jing HU Guohui CHEN Yanhua WANG Xiaodan WANG Junke YI Zihao ZHU Defeng ZHANG Yuping WANG Yaliang;ZHANG Yikai;SHI Qinghua;CHEN Huizhe;XIANG Jing;HU Guohui;CHEN Yanhua;WANG Xiaodan;WANG Junke;YI Zihao;ZHU Defeng;ZHANG Yuping

作者机构：China National Rice Research Institute/State Key Laboratory of Rice BiologyHangzhou 310006China College of AgronomyJiangxi Agricultural University/Key Laboratory of Crop PhysiologyEcology and Genetics BreedingMinistry of EducationNanchang 330045China 

出 版 物：《Rice science》 (水稻科学（英文版）)

年 卷 期：2020年第27卷第1期

页      面：44-55页

核心收录：

学科分类：09[农学] 0901[农学-作物学] 

基　　金：funded by the National Key Research and Development Program of China (Grant No. 2017YFD0300409) the Special Fund for China Agricultural Research System (Grant No. CARS-01-07B) Agricultural Sciences and Technologies Innovation Program of Chinese Academy of Agricultural Sciences, National Natural Science Foundation (Grant No. 31701374) Zhejiang Provincial Natural Science Foundation (Grant No. LY16C130006) Basic Research Foundation of National Commonweal Research Institute (Grant No. 2017RG004-4) in China 

主　　题：rice high temperature panicle development spikelet number carbohydrate allocation sugar consumption 

摘      要：Two rice genotypes Huanghuazhan(HHZ, heat-resistant) and IR36(heat-susceptible) were subjected to high-temperature(HT, 40℃) and normal-temperature(NT, 32℃) treatments at the spikelet differentiation stage. HT treatment inhibited spikelet differentiation, aggravated spikelet degeneration, reduced spikelet size, and disordered carbohydrate allocation. Meanwhile, HT treatment increased nonstructural carbohydrate content in leaves, but decreased that in stems and young panicles, and the same tendencies of sucrose and starch contents were observed in leaves and stem. However, HT treatment significantly increased the sucrose content and sharply decreased the glucose and fructose contents in young panicles. Lower activity levels of soluble acid invertase(EC3.***.1.26) and sucrose synthase(EC2.***.1.13) were observed under HT treatment. Moreover, HT treatment reduced the activities of key enzymes associated with glycolysis and the tricarboxylic acid cycle, which indicated sucrose consumption was inhibited in young panicles under HT treatment. Exogenous glucose and fructose applied under HT treatment increased the spikelet number more than exogenous sucrose. In conclusion, the results demonstrated that the reduction of spikelet number under high temperature was more affected by the decrease in sugar consumption than the blocking of sucrose transport. The impairment of sucrose hydrolysis was the main reason for the inhibition of sugar utilization.