湖南农业大学学报（自然科学版）2024，Vol.50Issue(1)：36-42,126,8.DOI:10.13331/j.cnki.jhau.2024.01.006
高温条件下早籼稻灌浆期生理变化与垩白形成的关系
Relationship between physiological changes and chalkiness formation in early indica rice under high temperature conditions
摘要
Abstract
To investigate the physiological mechanism of rice chalkiness formation under high temperature conditions,a pot experiment was conducted using high chalkiness trait Xiangzaoxian 24(X24)and its parents Xiangzaoxian 11(X11,high chalkiness trait)and Xiangzaoxian 7(X7,low chalkiness trait)as materials.On the 6th day after heading(DAH),the rice was moved to a greenhouse for 15 days of high temperature treatment(HT),with outdoor normal temperature treatment(NT)as a control.The changes in net photosynthetic rate of flag leaves,grain filling rate,grain amylose content,and relative expression levels of starch synthesis related genes under HT was studied during the filling period.The results showed that the chalkiness of X7,X11,and X24 under HT increased by 2.53,4.82,and 6.66 percentage points compared to the NT,respectively.High temperature caused the net photosynthetic rate of X11 and X24 to be significantly lower than that of the control on the 8th,12th,and 16th DAH,while the net photosynthetic rate of X7 leaves was higher than that of the control on the 16th DAH.The grain filling rate of HT increased on the 8th DAH and reached its maximum value on the 12th DAH,which was 4-8 days earlier than that of the control.The analysis of gene expression differences showed that the expression levels of genes OsSSIIIa,OsAGPSL2,and GBSSI related to starch synthesis in X11 and X24 grains were significantly down-regulated on the 12th and 16th DAH,which leading a decrease in amylose content and an increase in chalkiness in rice grain.关键词
早籼稻/高温胁迫/垩白/生理特性/淀粉合成Key words
early indica rice/high temperature stress/chalkiness/physiological characteristics/starch synthesis分类
农业科技引用本文复制引用
许金科,谢琴,魏曼琳,彭仟,苏益,萧浪涛,蔺万煌..高温条件下早籼稻灌浆期生理变化与垩白形成的关系[J].湖南农业大学学报（自然科学版）,2024,50(1):36-42,126,8.基金项目
湖南省自然科学基金项目(2022JJ30288) （2022JJ30288）
长沙市自然科学基金项目(kq2202220) （kq2202220）
