Does the Bradyrhizobium pachyrhizi BR 3262 elite strain overcome the native established soil rhizobial population on cowpea nodules occupation?

Authors

  • Jonnathan Whiny Moraes dos Santos
  • Aldrin Martin Pérez Marin
  • Jakson Leite
  • Lindete Míria Vieira Martins
  • Paula Rose de Almeida Ribeiro
  • Paulo Ivan Fernandes Júnior

Abstract

Cowpea (Vigna unguiculata L. Walp.) is a promiscuous crop, nodulating with a wide range of rhizobia strains native to the soil, what often leads to low inoculation responses with selected rhizobia, reducing the efficiency of introduced inoculants. This study aimed to assess the nodule occupancy of the Bradyrhizobium pachyrhizi BR 3262 elite strain in two cowpea genotypes (BRS Pujante and BRS Acauã), in soil with established rhizobial population (higher than 103 g-1 of soil), in a greenhouse. For the BR 3262 nodule occupancy, a strain-specific PCR approach was applied, assessing all the 1,237 nodules obtained from the root crown and the entire root (secondary roots) regions of the inoculated plants. The BR 3262 inoculation increased the root dry mass and nodulation, but not the shoot dry mass. Both genotypes showed a nodular occupancy above 80 % in the crown and secondary roots, indicating a high competitiveness and persistence in the soil.

KEYWORDS: Vigna unguiculata, biological nitrogen fixation, rhizobia competitiveness, nodulating bacteria.

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Published

2024-10-03

How to Cite

SANTOS, J. W. M. dos; MARIN, A. M. P.; LEITE, J.; MARTINS, L. M. V.; RIBEIRO, P. R. de A.; FERNANDES JÚNIOR, P. I. Does the Bradyrhizobium pachyrhizi BR 3262 elite strain overcome the native established soil rhizobial population on cowpea nodules occupation?. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], Goiânia, p. e79675, 2024. Disponível em: https://revistas.ufg.br/pat/article/view/79675. Acesso em: 21 nov. 2024.

Issue

v. 54 (2024)

Section

Scientific Note

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