DataVXAdvanced SciencePaper
journal article·2026-02Open access

Ratoon Season Rice Reduces Methane Emissions by Limiting Acetic Acid Transport to the Rhizosphere and Inhibiting Methanogens

Jingnan Zou, Hailong Xu, Bin Qin, Chaojie Lan, Jinying Li, Bianhong Zhang, Huabin Zhang, Chunlin Guo, Hongfei Chen, Zhongming Fang, Quanzhi Zhao, Wenfei Wang, Changxun Fang, Zhixing Zhang, Wenxiong Lin

Advanced Science· Volume 13· Issue 8
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Abstract

Abstract Rice paddies are a major, persistent source of atmospheric methane (CH 4 ), emission rates depend on the partitioning of photosynthate carbon between the rice plant and the rhizosphere microbiome. Although ratoon season rice (RR) is shown to emit far less CH 4 than main‐crop rice (MC), the mechanisms have remained unresolved. This work conducts a 2‐year field experiment in which RR is compared with MC and with late rice (LR) synchronized to the RR heading stage. Relative to MC and LR, RR lowers daily CH 4 flux by 91%, raises daily grain yield by 34%–57%, and increases net economic return by 90%–136%. Mechanistically, 13 C‐labelling reveals that RR diverted more newly fixed carbon to the grain and less to the rhizosphere, thereby restricting acetate availability for methanogens. Rhizosphere metagenomics show reduced abundance of Methanobacteriaceae and down‐regulation of methanogenic genes in RR. This carbon‐reallocation pattern is underpinned by an abscisic acid (ABA)‐mediated interaction between OsCIPK2 and OsSWEET1A, which simultaneously curtailed carbon efflux from roots and enhanced grain filling. This study is the first to establish a comprehensive framework of “ABA regulation—carbon allocation—microbial function—emission reduction and efficiency enhancement.” It provides targetable strategies for carbon allocation and microbial management within climate‐smart rice farming systems.
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Research context

OpenAlex topics: Soil Carbon and Nitrogen Dynamics · Plant responses to water stress · Anaerobic Digestion and Biogas Production

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring Fujian Agriculture and Forestry University College of Jun Cao Science and Ecology Fuzhou 350002 P. R. China

Key Laboratory of Crop Ecology and Molecular Physiology (Fujian Agriculture and Forestry University) Fujian Province University College of Jun Cao Science and Ecology Fuzhou 350002 P. R. China

College of Agriculture Fujian Agricultural and Forestry University Fuzhou 350002 China

Agricultural Ecology Research Institute School of Life Sciences Fujian Agriculture and Forestry University Fuzhou 350002 China

Institute of Rice Industry Technology Research/Key Laboratory of Functional Agriculture Guizhou Provincial Department of Education/Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region Ministry of Education/Key Laboratory of Molecular Breeding for Grain and Oil Crops in Guizhou Province/College of Agricultural Sciences Guizhou University Guiyang 550025 China

College of Tropical Crops Hainan University Haikou Hainan 570228 China

Funding

Chongqing Municipal Key Laboratory of Institutions of Higher Education · Key Laboratory of Microbial Resources and Drug Development in Guizhou Province

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