Alleviating Effect of Anti-stress Reagents Spraying on Super Early Rice on High Temperature during Grain-filling Period

doi:10.3969/j.issn.1000-6362.2019.09.004

Abstract

Abstract: Field experiments were conducted on natural high temperature with "Ankang 1" and " Youjigaiboshi " as materials and spraying clean water as CK. Physiological indices of flag leaves, rice yield and rice quality were determined to study the mitigation effect of high temperature spraying anti-stress reagents on super early rice during grain-filling period. The results showed that at high temperature, the activity of antioxidant enzymes increased significantly (P＜0.01) of super early rice after spraying "Ankang 1" (T2 treatment) and " Youjigaiboshi " (T3 treatment) for 4 days compared with spraying clear water (T1 treatment). The activities of SOD, POD and CAT increased by 17.10% and12.37%, 13.54% and 15.01%, 133.86% and 87.46%, respectively. The content of osmotic regulators in leaves increased significantly(P＜0.01). The content of soluble protein increased by 33.58%, 34.38%, and the content of soluble sugar increased by 23.74% and 17.30%, respectively. MDA content was significantly decreased(P＜0.01) by 28.34% and 26.53%. The attenuation rates of SPAD in flag leaves of super early rice treated with anti-stress reagents T2 and T3 for 22 days were significantly lower than those treated with T1(P＜0.05). They were reduced by 3.40 and 4.24 percentage points respectively. The SOD activity of flag leaves treated with T2 and T3 was significantly higher than that treated with T1(P＜0.05); POD activity was not significantly different; CAT activity was significantly increased(P＜0.01); soluble protein content was significantly increased(P＜0.05); soluble sugar content was significantly increased(P＜0.01); MDA content was significantly decreased(P＜0.01). The treatment of spraying anti-stress reagents significantly increased the seed setting rate by 5.7 percentage points and the yield by 11.87%-13.77%. Improve the appearance quality and processing quality of super early rice. The results showed that spraying anti-stress reagents could effectively alleviate the damage of high temperature to grain filling and Fruiting of super early rice.

Key words: Super early rice, Grain-filling period, High temperature, Anti-stress reagents, Alleviating effect

GUO Li-jun, CHENG Kai-kai, XIAO Xiao-ping, LI Chao, WANG Ke, TANG Wen-guang, . Alleviating Effect of Anti-stress Reagents Spraying on Super Early Rice on High Temperature during Grain-filling Period[J]. Chinese Journal of Agrometeorology, 2019, 40(09): 583-590.

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