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

It is useful to explore the strategy of soil –crop management by introducing rhizobacteria to regulate plant ethylene signal and then benefit sustainable agriculture. Localized nutrient supply can enhance maize root proliferation, but also increase root ethylene production. The rhizobacteria containing ACC deaminase (V. paradoxus 5C ‐2) can further enhance root proliferation and nutrient uptake of maize plants by reducing ethylene release in the nutrient‐rich zone. We are the first to report the positive effect of rhizobacteria V. paradoxus 5C‐2 on maize growth in field condition. AbstractLocalized 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 rhizobacteriumVariovorax 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...
Source: Food and Energy Security - Category: Food Science Authors: Tags: ORIGINAL RESEARCH Source Type: research