Mangrove endophyte promotes reforestation tree (Acacia polyphylla) growth

Autor(es)

Castro, Renata Assis ; Dourado, Manuella Nobrega ; de Almeida, Jaqueline Raquel ; Lacava, Paulo Teixeira ; Nave, Andre ; de Melo, Itamar Soares ; de Azeuedo, Joao Lucio ; Quecine, Maria Carolina

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Journal of Microbiology; v. 49, n. 1, p. 8-pg., 2018-01-01.

Resumo

Mangroves are ecosystems located in the transition zone between land and sea that serve as a potential source of biotechnological resources. Brazil's extensive coast contains one of the largest mangrove forests in the world (encompassing an area of 25,000 km(2) along all the coast). Endophytic bacteria were isolated from the following three plant species: Rhizophora mangle, Laguncularia racemosa and Auicennia nitida. A large number of these isolates, 115 in total, were evaluated for their ability to fix nitrogen and solubilize phosphorous. Bacteria that tested positive for both of these tests were examined further to determine their level of indole acetic acid production. Two strains with high indole acetic acid production were selected for use as inoculants for reforestation trees, and then the growth of the plants was evaluated under field conditions. The bacterium Pseudomonas fluorescens (strain MCR1.10) had a low phosphorus solubilization index, while this index was higher in the other strain used, Enterobacter sp. (strain MCR1.48). We used the reforestation tree Acacia polyphylla. The results indicate that inoculation with the MCR1.48 endophyte increases Acacia polyphylla shoot dry mass, demonstrating that this strain effectively promotes the plant's growth and fitness, which can be used in the seedling production of this tree. Therefore, we successfully screened the biotechnological potential of endophyte isolates from mangrove, with a focus on plant growth promotion, and selected a strain able to provide limited nutrients and hormones for in plant growth. (C) 2017 Sociedade Brasileira de Microbiologia. Published by Elsevier Editora Ltda. This is an open access article under the CC BY-NC-ND license (AU)

• Processo FAPESP: 04/15414-6 - Diversidade de methylobacterium spp.de diferentes hospedeiros.
• Beneficiário: Manuella Nóbrega Dourado Ribeiro
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica