叶面喷施硅和硒对水稻砷积累及光合参数的影响
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S-3

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国家自然科学基金项目(31672238))资助。


Effect of Foliage Spraying Si and Se on As Accumulation and Photosynthetic Parameters of Rice
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the National Natural Science Foundation of China (No.31672238) and Basic Scientific Research Business Expenses of Central Universities (XDJK2019B039)

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    摘要:

    本文采用盆栽试验,研究了在砷污染土壤上,水稻叶面分别喷施硅溶液、硒溶液和硅硒混合溶液对籽粒砷含量相对较低的水稻品种旌1优华珍和C两优华占以及籽粒砷含量相对较高的水稻品种丰优香占砷积累和光合参数的影响。试验结果表明,3种叶面喷施处理相比较而言,以叶面单独喷施硅降低水稻籽粒砷含量效果最好,优于叶面单施硒和叶面喷施硅硒混合液处理。叶面单独喷施硅与对照相比,显著降低了籽粒砷含量相对较低的两个水稻品种的籽粒砷含量,但对籽粒砷含量相对较高的水稻品种则没有显著影响。籽粒砷含量相对较低的水稻品种更多比例的砷固定在茎中使其稻米砷积累量较低。3种叶面喷施处理与对照相比均提高了水稻光合参数(如光合速率、气孔导度、胞间CO2浓度),光合参数与水稻砷浓度呈负相关关系,叶面喷施硅或硒对水稻叶片光合参数的影响差异可能是造成籽粒砷含量差异的重要原因,不同水稻品种叶片光合参数对外源硅或硒的敏感度或响应度不同。总之,叶面喷施硅溶液对改善水稻光合参数的效果最好,是减少水稻籽粒砷含量一项经济有效的措施,在生产应用实践中,要注意作物品种间的差异。

    Abstract:

    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.

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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

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