the National Natural Science Foundation of China (No.31672238) and Basic Scientific Research Business Expenses of Central Universities (XDJK2019B039)
A pot experiment was conducted to study the effects of foliage spraying silicon (Si) solution, selenium (Se) solution and mixed solution of Si and Se on As accumulation and photosynthetic parameters of rice varieties Jing1youhuazhen and Cliangyouhuazhan with lower As content in grains and Fengyouxiangzhan with higher As content in grains. The results showed that single foliage spraying Si had the best effect on reducing As content in grains, which was better than single foliage spraying Se and mixed foliage spraying Si and Se. Compared with CK, foliage spraying Si significantly reduced As content in grains of the two rice varieties with lower As content, but had no significant effect on the rice varieties with higher As content. For rice varieties with lower As content, more As was fixed in stems, which resulted in lower As accumulation in grains. Photosynthetic parameters (such as photosynthetic rate, stomatal conductance and intercellular CO2 concentration) of rice leaves were increased by foliage spraying Si and Se. There was a negative correlation between photosynthetic parameters and As concentration in rice. The differences in the effects of foliage spraying Si or Se on photosynthetic parameters of rice leaves may be an important reason for the difference of As content in grains, and the sensitivity or response of photosynthetic parameters of different rice varieties was different to exogenous Si or Se. In conclusion, foliage spraying Si has the best effect on improving photosynthetic parameters of rice leaves, which is economic and effective to reduce As content in rice grains.
杨静,王瑞昕,方正,周鑫斌.叶面喷施硅和硒对水稻砷积累及光合参数的影响[J].土壤,2022,54(3):547-555. YANG Jing, WANG Ruixin, FANG Zheng, ZHOU Xinbin. Effect of Foliage Spraying Si and Se on As Accumulation and Photosynthetic Parameters of Rice[J]. Soils,2022,54(3):547-555复制