Comparison of N uptake of maize inoculated with two diazotrophic bacterial species grown under two N levels

Dias, Albiane Carvalho; Alves, Gabriela Cavalcanti; Silva, Thamires Ferreira Rodrigues da; Alves, Bruno José Rodrigues; Santos, Leandro Azevedo; Reis, Verônica Massena

doi:10.1080/03650340.2021.1922672

Cited by 4 publications

(2 citation statements)

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“…The diazotrophic bacterium H. seropedicae, can affect the nitrogen metabolism of the plant host [ 25 , 26 , 48 , 49 , 50 ]. Using transcriptomic and proteomic approaches, this study allowed us to better understand how inoculation can modulate nitrogen acquisition and metabolism.…”

Section: Discussionmentioning

confidence: 99%

“…Brazil is the second larger exporter of maize in the world, with around 16 million hectares of cultivated area [ 21 ]. Selected strains of H. seropedicae had shown a promising effect in promoting plant growth and protection, being a potential candidate for microbial formulation in maize and other grasses such as grass pastures [ 22 , 23 , 24 , 25 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

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Multiomic Approaches Reveal Hormonal Modulation and Nitrogen Uptake and Assimilation in the Initial Growth of Maize Inoculated with Herbaspirillum seropedicae

Irineu

Soares

et al. 2022

Plants

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Herbaspirillum seropedicae is an endophytic bacterium that can fix nitrogen and synthesize phytohormones, which can lead to a plant growth-promoting effect when used as a microbial inoculant. Studies focused on mechanisms of action are crucial for a better understanding of the bacteria-plant interaction and optimization of plant growth-promoting response. This work aims to understand the underlined mechanisms responsible for the early stimulatory growth effects of H. seropedicae inoculation in maize. To perform these studies, we combined transcriptomic and proteomic approaches with physiological analysis. The results obtained eight days after inoculation (d.a.i) showed increased root biomass (233 and 253%) and shoot biomass (249 and 264%), respectively, for the fresh and dry mass of maize-inoculated seedlings and increased green content and development. Omics data analysis, before a positive biostimulation phenotype (5 d.a.i.) revealed that inoculation increases N-uptake and N-assimilation machinery through differentially expressed nitrate transporters and amino acid pathways, as well carbon/nitrogen metabolism integration by the tricarboxylic acid cycle and the polyamine pathway. Additionally, phytohormone levels of root and shoot tissues increased in bacterium-inoculated-maize plants, leading to feedback regulation by the ubiquitin-proteasome system. The early biostimulatory effect of H. seropedicae partially results from hormonal modulation coupled with efficient nutrient uptake-assimilation and a boost in primary anabolic metabolism of carbon–nitrogen integrative pathways.

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