An endophytic Pseudomonas sp. of Piper tuberculatum promotes growth on Piper nigrum through increase of root biomass production

Publication date: Available online 24 June 2019Source: Physiological and Molecular Plant PathologyAuthor(s): Angelo Cleiton da Costa Pereira, Gledson Luiz Salgado de Castro, Paulo Canas Rodrigues, Gisele Barata Silva, Danyllo Amaral de Oliveira, Cláudia Regina Batista de SouzaAbstractMicroorganisms that can positively influence plants have emerged as a powerful tool for sustainable agriculture. Previous studies identified a Pseudomonas sp. (Pt13) associated with the roots of Piper tuberculatum, a member of the Piperaceae occurring in the Amazon region with known resistance to infection by Fusarium solani f. sp. piperis, which causes root rot in black pepper (Piper nigrum L.). Pt13 was able to inhibit the in vitro growth of this pathogen by 55.31%; however, studies on P. nigrum as a host plant of Pt13 are lacking. Therefore, we aimed to evaluate the effects of Pt13 inoculation on P. nigrum growth under greenhouse conditions. The experiments comprised two treatments (inoculated and control) with 10 replicates per treatment and samplings at 30, 60 and 90 days post inoculation (dpi). Results revealed that the plants inoculated by immersion of roots in bacterial suspension showed no physiological differences in comparison to the control plants at 30 dpi. However, when these plants were submitted to additional inoculations through irrigation of soil with bacterial suspension repeated every 10 days, they showed an increment of 32% and 49% in net CO2 assimilation rate and 23.94% and...
Source: Physiological and Molecular Plant Pathology - Category: Molecular Biology Source Type: research