Rhizosphere bacteria containing ACC deaminase decrease root ethylene emission and improve maize root growth with localized nutrient supply

Food and Energy Security

Andrey A. Belimov¹  Hongbo Li²  Kemo Jin³  Jianbo Shen³  Haigang Li³  William J. Davies⁴  Ian C. Dodd⁴  Xiaoqing Li⁴ 

[1] All‐Russia Research Institute for Agricultural Microbiology St. Petersburg Russian Federation;Institute of Environment and Sustainable Development in AgricultureChinese Academy of Agricultural Sciences Beijing China;National Academy of Agriculture Green Development Department of Plant Nutrition College of Resource and Environmental SciencesChina Agricultural University Beijing China;The Lancaster Environment Centre Lancaster University Lancashire UK;

关键词: ACC deaminase;    ethylene;    localized nutrient supply;    maize;    rhizobacteria;   

DOI  :  10.1002/fes3.278

来源: DOAJ

【 摘 要 】

Abstract Localized nutrient supply can enhance maize root proliferation, but also increase root ethylene production. Whether engineering ethylene signalling in the rhizosphere can further enhance root growth and nutrient uptake remains unknown. Here, field and column experiments for maize (Zea mays. L) were designed as different nutrient treatments (broadcast or localized nutrient supply containing ammonium and phosphorus) with or without inoculation with rhizobacterium Variovorax paradoxus 5C‐2 containing the 1‐aminocyclopropane‐1‐carboxylate (ACC) deaminase. Rhizobacterial inoculation increased shoot biomass by 12% and root length density by 50% with localized nutrient supply. Meanwhile, localized nutrient supply increased root ethylene production by 54% compared with broadcast, and rhizobacterial inoculation prevented the increase in root ethylene. Reduced root ethylene production following V. paradoxus 5C‐2 inoculation was highly associated with a greater proportion of fine root proliferation under localized nutrient supply, which may account for the increased nitrogen and phosphorus uptake. Our work sheds light on the understanding of the interactions between root and microbe through taking hormone into consideration to dissect the relationship between below ground and above ground. It is useful to explore the strategy of soil–crop management by introducing rhizosphere microorganisms to regulate plant ethylene signal and then benefit sustainable agriculture.

【 授权许可】

Unknown