Compatibility of Azospirillum brasilense with Pesticides Used for Treatment of Maize Seeds

International Journal of Microbiology
Mariana S SantosMariangela Hungria

Abstract

Seed treatment with chemical pesticides is commonly used as an initial plant protection procedure against pests and diseases. However, the use of such chemicals may impair the survival and performance of beneficial microorganisms introduced via inoculants, such as the plant growth-promoting bacterium Azospirillum brasilense. We assessed the compatibility between the most common pesticide used in Brazil for the treatment of maize seeds, composed of two fungicides, and one insecticide, with the commercial strains Ab-V5 and Ab-V6 of A. brasilense, and evaluated the impacts on initial plant development. The toxicity of the pesticide to A. brasilense was confirmed, with an increase in cell mortality after only 24 hours of exposure in vitro. Seed germination and seedling growth were not affected neither by the A. brasilense nor by the pesticide. However, under greenhouse conditions, the pesticide affected root volume and dry weight and root-hair incidence, but the toxicity was alleviated by the inoculation with A. brasilense for the root volume and root-hair incidence parameters. In maize seeds inoculated with A. brasilense, the pesticide negatively affected the number of branches, root-hair incidence, and root-hair length. Therefore...Continue Reading

References

Oct 1, 1982·Applied and Environmental Microbiology·E A Cáceres
Jul 12, 2012·Interdisciplinary Toxicology·Awad G OsmanAfrah T Mohamed
Feb 5, 2013·Annual Review of Plant Biology·Davide BulgarelliPaul Schulze-Lefert
Feb 14, 2013·Development·Karin Ljung
Mar 13, 2013·Annals of Botany·Carole SantiClaudine Franche
Oct 27, 2017·Ciência & saúde coletiva·Wanderlei Antonio PignatiMarta Gislene Pignatti
May 8, 2018·AMB Express·Josiane FukamiMariangela Hungria

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