Associative bacteria influence maize (Zea mays L.) growth, physiology and root anatomy under different nitrogen levels.

Autor: Calzavara AK; Department of Animal and Plant Biology, UEL - Londrina State University, Londrina, Brazil., Paiva PHG; Department of Animal and Plant Biology, UEL - Londrina State University, Londrina, Brazil., Gabriel LC; Department of Fitotecnia, UEM - Maringá State University, Maringá, Brazil., Oliveira ALM; Department of Biochemistry and Biotechnology, UEL - Londrina State University, Londrina, Brazil., Milani K; Department of Biochemistry and Biotechnology, UEL - Londrina State University, Londrina, Brazil., Oliveira HC; Department of Animal and Plant Biology, UEL - Londrina State University, Londrina, Brazil., Bianchini E; Department of Animal and Plant Biology, UEL - Londrina State University, Londrina, Brazil., Pimenta JA; Department of Animal and Plant Biology, UEL - Londrina State University, Londrina, Brazil., de Oliveira MCN; Embrapa Soybean, Londrina, Brazil., Dias-Pereira J; Department of Botany, Instituto de Ciências Biológicas e da Saúde, UFV- Universidade Federal de Viçosa, Campus Rio Paranaíba, Brazil., Stolf-Moreira R; Department of Animal and Plant Biology, UEL - Londrina State University, Londrina, Brazil.
Jazyk: angličtina
Zdroj: Plant biology (Stuttgart, Germany) [Plant Biol (Stuttg)] 2018 Sep; Vol. 20 (5), pp. 870-878. Date of Electronic Publication: 2018 Jun 06.
DOI: 10.1111/plb.12841
Abstrakt: Despite the great diversity of plant growth-promoting bacteria (PGPB) with potential to partially replace the use of N fertilisers in agriculture, few PGPB have been explored for the production of commercial inoculants, reinforcing the importance of identifying positive plant-bacteria interactions. Aiming to better understand the influence of PGPB inoculation in plant development, two PGPB species with distant phylogenetic relationship were inoculated in maize. Maize seeds were inoculated with Bacillus sp. or Azospirillum brasilense. After germination, the plants were subjected to two N treatments: full (N+) and limiting (N-) N supply. Then, anatomical, biometric and physiological analyses were performed. Both PGPB species modified the anatomical pattern of roots, as verified by the higher metaxylem vessel element (MVE) number. Bacillus sp. also increased the MVE area in maize roots. Under N+ conditions, both PGPB decreased leaf protein content and led to development of shorter roots; however, Bacillus sp. increased root and shoot dry weight, whereas A. brasilense increased photosynthesis rate and leaf nitrate content. In plants subjected to N limitation (N-), photosynthesis rate and photosystem II efficiency increased in maize inoculated with Bacillus sp., whilst A. brasilense contained higher ammonium, amino acids and total soluble sugars in leaves, compared to the control. Plant developmental and metabolical patterns were switched by the inoculation, regardless of the inoculant bacterium used, producing similar as well as distinct modifications to the parameters studied. These results indicate that even non-diazotrophic inoculant strains can improve the plant N status as result of the morpho-anatomical and physiological modifications produced by the PGPB.
(© 2018 German Society for Plant Sciences and The Royal Botanical Society of the Netherlands.)
Databáze: MEDLINE
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