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

Jin, Kemo and Li, Hongbo and Li, Xiaoqing and Li, Haigang and Dodd, Ian C. and Belimov, Andrey A. and Davies, William J. and Shen, Jianbo (2021) Rhizosphere bacteria containing ACC deaminase decrease root ethylene emission and improve maize root growth with localized nutrient supply. Food and Energy Security, 10 (2). pp. 275-284. ISSN 2048-3694

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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.

Item Type:
Journal Article
Journal or Publication Title:
Food and Energy Security
Subjects:
ID Code:
183095
Deposited By:
Deposited On:
17 Jan 2023 11:40
Refereed?:
Yes
Published?:
Published
Last Modified:
17 Jan 2023 11:40