Rhizobacteria increase the growth and quality of Handroanthus chrysotrichus (Mart. ex DC.) Mattos seedlings

Thiago Souza Campos; Guilherme Rodrigues  Vieira; Antonio Maricélio Borges de Souza; Carlos Henrique Barbosa Santos; Everlon Cid Rigobelo; Kathia Fernandes Lopes Pivetta

doi:10.53661/1806-9088202448263634

Authors

Thiago Souza Campos Universidade Estadual Paulista, Programa de Pós-Graduação em Agronomia (Produção Vegetal), Jaboticabal, SP - Brasil
Guilherme Rodrigues Vieira Universidade Estadual Paulista, Programa de Pós-Graduação em Agronomia (Produção Vegetal), Jaboticabal, SP - Brasil
Antonio Maricélio Borges de Souza Universidade Federal de Viçosa, Programa de Pós-graduação em Fitotecnia, Viçosa, MG - Brasil
Carlos Henrique Barbosa Santos Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias - Departamento de Ciências da Produção Agrícola, Jaboticabal, SP - Brasil
Everlon Cid Rigobelo Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias - Departamento de Ciências da Produção Agrícola, Jaboticabal, SP - Brasil
Kathia Fernandes Lopes Pivetta Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias - Departamento de Ciências da Produção Agrícola, Jaboticabal, SP - Brasil

DOI:

https://doi.org/10.53661/1806-9088202448263634

Keywords:

Azospirillum brasilense, Bacillus spp., Plant growth-promoting microorganisms

Abstract

Handroanthus chrysotrichus (Mart. ex DC.) Mattos, popularly known as the golden trumpet tree, is a native tree of Brazil with exuberant flowering. It is used for urban afforestation and reforestation of degraded areas, and its wood is destined for several purposes. In order to develop vigorous plants after planting, it is essential to produce high-quality seedlings, which can be obtained using rhizobacteria. As renewable sources, rhizobacteria exhibit growth-promoting properties, facilitate nutrient uptake and/or solubilization, and contributes to the production of phytohormones, while also serving as pathogen controllers and mitigators of abiotic stress. These attributes collectively enable the establishment of a sustainable production system for producing vigorous and rapidly growing seedlings. This study aimed to evaluate the effect of plant growth-promoting rhizobacteria in the production of H. chrysotrichus seedlings. The experimental design followed a completely randomized setup. The treatments consisted of microorganisms (Bacillus subtilis, Bacillus megaterium, Bacillus amyloliquefaciens, and Azospirillum brasilense) plus the absence of microorganisms - control; four repetitions and ten plants-per-plot. The parameters evaluated were shoot height; stem diameter; root length; shoot, root, and total dry matter; leaf number and leaf area, as well as chlorophyll content; minimum and maximum fluorescence; and maximum quantum efficiency of photosystem II; shoot height/stem diameter ratio and Dickson's Quality Index. The B. amyloliquefaciens inoculation promoted an increase in seedling shoot height, stem diameter, root length, leaf area, shoot, root, and total dry matter and also increased the Dickson Quality Index. It can be concluded that B. amyloliquefaciens is the most efficient inoculant for producing golden trumpet tree seedlings, followed by A. brasilense.

Keywords: Azospirillum brasilense; Bacillus spp.; Plant growth-promoting microorganisms.