Comprehensive analysis of SUSIBA2 rice: The low-methane trait and associated changes in soil carbon and microbial communities

文献类型： 外文期刊

第一作者： Du, Lin

作者： Du, Lin;Wang, Yunfei;Shan, Zhen;Shen, Xueliang;Wang, Feng;Su, Jun

作者机构：

关键词： SUSIBA2 rice; CH4 emission; Microbial biomass carbon; Methanogen; Methanotroph

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2021 年 764 卷

页码：

收录情况： SCI

摘要： Rice cultivation is the primary source of anthropogenic methane (CH4), which dramatically impacts global climate change. A growing body of evidence shows that optimizing photosynthate distribution is important for increasing rice yields and mitigating CH4 emissions. Therefore, the molecular rice breeding with a barley HvSUSIBA2 gene that confers elevated photosynthate flux to grains, is predicted to enhance rice yield and mitigate CH4 emissions in paddies. Here, in a series of field experiments with differences in growing season and rice variety, we show that SUSIBA2 rice reduced CH4 emissions from paddies. SUSIBA2 rice grown in the early rice season and late rice season showed similar mitigation effects, with reduction rates of 50.98% for early rice and 50.97% for late rice. The reduction rate of SUSIBA2 rice during the winter rice season was significantly lower (22.26%) than those of other rice seasons. The reduction rates also varied between rice varieties, and SUSIBA2 japonica rice showed a more significant CH4 mitigation effect than SUSIBA2 indica rice. Further yield-scaled CH4 emission analyses indicated that the SUSIBA2 effect did not mitigate CH4 emissions at the expense of yield. Compared with the wild type, SUSIBA2 rice significantly reduced soil organic carbon properties and the abundance of CH4-related microbes, and altered methanogenic and methanotrophic communities, indicating that SUSIBA2 rice released less carbon to the soil, which reduced CH4 production. Furthermore, a comparison of microbial communities between SUSIBA2 japonica and indica rice revealed different responses of methanogenic and methanotrophic communities, which may partly explain their differences in growth performance and CH4 mitigation effect. Thus, our results show that SUSIBA2 rice substantially reduces CH4 emissions and that SUSIBA2 can potentially mitigate the CH4 emissions of japonica and indica rice under distinct cultivation conditions. (C) 2020 Elsevier B.V. All rights reserved.

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