LI Jian-ling1,LIN Yu-jiong1,ZHANG Xiao-yan1,DU Yao-dong1,2,WANG Hua2,WU Li-ji1,HU Fei1(1.College of Agriculture,South China Agricultural University,Guangzhou,Guangdong 510642,China;2.Climate Centre of Guangdong Province,Guangdong,Guangzhou 510080,China)
In order to investigate the mechanism of flag leaves responded to high temperature, and to provide suggestions for early rice copping with climate warming, the super hybrid rice Tianyou 998 were subjected to high temperature in heading and milk stage respectively (daily highest temperature 32℃, 35℃, 38℃, 40℃, and 42℃ with 6℃ differences a day for 5 days, natural condition as CK) in climate chambers with pot-cultured. The results showed that the physiological and biochemical indexes of flag leaves were changed after heating treatment. Both superoxide dismutase (SOD) and peroxidase (POD) enzyme activities decreased. However, the content of soluble protein, proline, malondialdehyde (MDA) and the relative electrolyte leakage increased as the daily highest temperature increased. The yield components, such as the seed setting rate and weight of 1000-grains declined. The milled rice percentage and head rice percentage was also seriously impacted. On the contrary, both chalky grain percentage and chalkiness degree increased. The physiological and biochemical indexes of flag leaves correlated with yield and quality significantly, except the content of soluble sugar. Furthermore, the flag leaves could be affected seriously when the daily highest temperature was above 38℃ in heading and milk stage, but the yield and quality decreased when the daily highest temperature reached 35℃.
李健陵,林育炯,张晓艳,杜尧东,王华,吴丽姬,胡飞. 抽穗期和乳熟期高温对水稻剑叶理化特性以及产量和品质的影响[J]. 农业现代化研究, 2013, 34(1): 109-113
LI Jian-ling, LIN Yu-jiong, ZHANG Xiao-yan, DU Yao-dong, WANG Hua, WU Li-ji, HU Fei. Effects of High Temperature on Physiological and Biochemical Characteristics of Flag Leaves, Grain Yield and Quality of Rice in Heading and Milk Stage[J]. Research of Agricultural Modernization, 2013, 34(1): 109-113