Plant Growth Promotion Abilities of Phylogenetically Diverse Mesorhizobium Strains: Effect in the Root Colonization and Development of Tomato Seedlings

Microorganisms

Milagros León-Barrios¹  Ana Rodríguez-Pérez¹  Juan Pérez-Yépez¹  Encarna Velázquez²  Mercedes Hernández³  Esther Menéndez⁴ 

[1] Departamento de Bioquímica, Microbiología, Biología Celular y Genética, Universidad de La Laguna, 38200 Tenerife, Canary Islands, Spain;Departamento de Microbiología y Genética and Instituto Hispanoluso de Investigaciones Agrarias (CIALE), Universidad de Salamanca, 37007 Salamanca, Spain;Instituto de Productos Naturales y Agrobiología-CSIC, La Laguna, 38206 Tenerife, Canary Islands, Spain;Mediterranean Institute for Agriculture, Environment and Development (MED), Instituto de Investigação e Formação Avançada, Universidade de Évora, 7006-554 Évora, Portugal;

关键词: mesorhizobium;    phylogeny;    canary islands;    plant root colonization;    biofilms;    plant growth promotion;    tomato;    biofertilization;   

DOI  :  10.3390/microorganisms8030412

来源: DOAJ

【 摘 要 】

Mesorhizobium contains species widely known as nitrogen-fixing bacteria with legumes, but their ability to promote the growth of non-legumes has been poorly studied. Here, we analyzed the production of indole acetic acid (IAA), siderophores and the solubilization of phosphate and potassium in a collection of 24 strains belonging to different Mesorhizobium species. All these strains produce IAA, 46% solubilized potassium, 33% solubilize phosphate and 17% produce siderophores. The highest production of IAA was found in the strains Mesorhizobium ciceri CCANP14 and Mesorhizobium tamadayense CCANP122, which were also able to solubilize potassium. Moreover, the strain CCANP14 showed the maximum phosphate solubilization index, and the strain CCANP122 was able to produce siderophores. These two strains were able to produce cellulases and cellulose and to originate biofilms in abiotic surfaces and tomato root surface. Tomato seedlings responded positively to the inoculation with these two strains, showing significantly higher plant growth traits than uninoculated seedlings. This is the first report about the potential of different Mesorhizobium species to promote the growth of a vegetable. Considering their use as safe for humans, animals and plants, they are an environmentally friendly alternative to chemical fertilizers for non-legume crops in the framework of sustainable agriculture.

【 授权许可】

Unknown