文献类型： 外文期刊
作者： Jin, Yunkai 1 ; Liu, Tong 4 ; Hu, Jia 1 ; Sun, Kai 5 ; Xue, Lihong 6 ; Bettembourg, Mathilde 3 ; Bedada, Girma 3 ; Hou, Pengfu 1 ; Hao, Peiying 5 ; Tang, Jintian 5 ; Ye, Zihong 5 ; Liu, Chunlin 1 ; Li, Peng 7 ; Pan, Aihu 7 ; Weng, Lushui 8 ; Xiao, Guoying 8 ; Moazzami, Ali A. 4 ; Yu, Xiaoping 5 ; Wu, Jun 1 ; Schnurer, Anna 4 ; Sun, Chuanxin 3 ;
作者机构： 1.Hunan Agr Univ, Coll Agron, Changsha 410128, Peoples R China
2.Yuelushan Lab, Changsha 410128, Peoples R China
3.Swedish Univ Agr Sci SLU, Linnean Ctr Plant Biol, Dept Plant Biol, Uppsala Bioctr, POB 7080, S-75007 Uppsala, Sweden
4.Swedish Univ Agr Sci SLU, Dept Mol Sci, Uppsala Bioctr, POB 7015, S-75007 Uppsala, Sweden
5.China Jiliang Univ, Coll Life Sci, Zhejiang Prov Key Lab Biometrol & Inspect & Quaran, Hangzhou 310018, Peoples R China
6.Jiangsu Acad Agr Sci, Key Lab Agroenvironm Downstream Yangtze Plain, Minist Agr & Rural Affairs China, Nanjing 210014, Peoples R China
7.Shanghai Acad Agr Sci, Biotechnol Res Inst, Shanghai 201106, Peoples R China
8.Chinese Acad Sci, Inst Subtrop Agr, Changsha 410125, Peoples R China
关键词： paddy; methane emission; root exudates; fumarate; ethanol; low-methane rice
期刊名称：MOLECULAR PLANT （ 影响因子：24.1； 五年影响因子：25.8 ）
ISSN： 1674-2052
年卷期： 2025 年 18 卷 2 期
页码：
收录情况： SCI
摘要： Methane in rice paddies is mainly produced by methanogenic communities feeding on carbon from root exudates and debris. However, the dominant root secretion governing methane emissions is not yet identified after decades of studies, even though secreted carbohydrates and organic acids have been shown to contribute to methane emissions. In this study, we discovered that fumarate and ethanol are two major rice-orchestrated secretions and play a key role in regulating methane emissions. Fumarate released in the rhizosphere is metabolized by microorganisms, supporting the growth of methanogenic archaea that produce methane as an end carbon product, while ethanol mitigates methane emissions through inhibition of methanogenic activity and growth as well as reducing fumarate synthesis in the rice root. Furthermore, we elucidated the route of fumarate metabolism in the anoxic rhizospheric zone. We found that fumarate in the rice root is produced from acetate via propionate and succinate, and when released into soil directly is oxidized to propionate before conversion via acetate into methane as the end product. The knowledge on fumarate and ethanol metabolism in rice was then used for hybrid breeding of new rice varieties with the property of low methane emission. Cultivation of these novel rice lines or employing our findings for rice cultivation managements showed up to 70% reductions in methane production from seven paddy field sites during 3 years of cultivation trials. Taken together, these findings offer great possibilities for effective mitigation of the global climatic impact of rice cultivation.
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