Development of wheat plants coinoculated with rhizobium strains

Wellington F Roque,Edna M Bonfim-Silva,Salomão L Guimarães

doi:10.1590/1807-1929/agriambi.v25n11p758-763

Wellington F Roque, Edna M Bonfim-Silva + Show 1 more

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https://doi.org/10.1590/1807-1929/agriambi.v25n11p758-763

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Abstract

ABSTRACT This study aimed to evaluate the efficiency of diaztrophic bacteria coinoculation in wheat cultivars grown in Cerrado Oxisol. A randomized block design was used, with a 13 x 3 factorial scheme and four replicates. The treatments consisted of inoculation with Azospirillum brasilense (strains AbV5 and AbV6 strains combined) and coinoculation with Bradyrhizobium japonicum (strains SEMIA 5079 and SEMIA 5080 combined, and strain BR3267), as well as Rhizobium tropici (strains MT08 and MT15) and R. leguminosarum (strain MT16) combined or in isolation, tested in wheat cultivars BRS 394, BRS 264 and BRS 254. The variables analyzed were grain nitrogen concentration and accumulation and crude protein content, 100-grain weight and total grain mass. The treatment containing the commercial cowpea inoculant showed a higher total grain mass (5.8766 g). Interaction was observed for grain nitrogen concentration, particularly for A. brasilense + MT 15 (R. tropici) and MT 15 in wheat cultivar BRS 264. Coinoculation with diazotrophic bacteria isolated from leguminous plants shows potential for use in wheat cultivars.

Highlights

The Brazilian Midwest region accounts for 3% of national wheat production, with significant potential for expansion in the production of cereals (Pasinato et al, 2018)
This study aimed to evaluate the efficiency of diaztrophic bacteria coinoculation in wheat cultivars grown in Cerrado Oxisol
The treatments consisted of inoculation with Azospirillum brasilense and coinoculation with Bradyrhizobium japonicum, as well as Rhizobium tropici and R. leguminosarum combined or in isolation, tested in wheat cultivars BRS 394, BRS 264 and BRS 254

Summary

Introduction

The Brazilian Midwest region accounts for 3% of national wheat production, with significant potential for expansion in the production of cereals (Pasinato et al, 2018). Studies aimed at determining optimal fertilizer doses and the efficiency of biological fertilization of wheat in zoning areas of the Brazilian Cerrado region suitable for new cultivars, showed good yields and qualitative performance for the crop (Bonfim-Silva et al, 2018; Galindo et al, 2018). Biological nitrogen fixation occurs due to the association between these plants and several genera of microorganisms, such as Azospirillum, Herbaspirillum, Gluconacetobacter, Burkholderia. These bacteria produce and exude hormones such as cytokinin, gibberellin and indolacetic acid, promoting plant growth, ensuring better use of phosphorus, potassium and iron and providing the increased energy needed for nitrate reductase activity (Guimarães et al, 2015; Chen et al, 2017; Grageda-Cabrera et al, 2018)

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