Data/hora: 16/06/2024 09:28:12

Provedor de dados: | 65
País: | Brazil
Título: | Selection of efficient rhizobial symbionts for  Cratylia argentea in the cerrado biome
Autores: | Calazans,Giovanna Moura; Oliveira,Christiane Abreu de; Cruz,José Carlos; Matrangolo,Walter José Rodrigues; Marriel,Ivanildo Evódio.
Data: | 2016-09-01
Ano: | 2016
Palavras-chave: | Biological fixation; Legumes; Cerrado.
Resumo: | ABSTRACT:   Cratylia argentea is a leguminous shrub native to the cerrado, which has great potential for forage production and recovery of degraded areas. This study aimed to isolate, characterize, and select efficient rhizobial strains in symbiosis with Cratylia argentea . Rhizobacteria were isolated from the nodules of 12-month-old plants and cultivated in pots containing cerrado soil. Twenty-five bacterial strains were obtained, which displayed extensive variability with respect to morphological and symbiotic characteristics. Cratylia argentea seeds were planted in pots containing 5kg of cerrado soil and maintained in the greenhouse. The treatments consisted of 25 rhizobial isolates, two controls (without nitrogen and without inoculation), with or without nitrogen fertilization (5mgN·plant-1·week-1), and four replications. Plants were cultivated for 150 days after planting seeds to evaluate nodule number, nodule dry weight, shoot and root dry weight, shoot and root N content, and relative and symbiotic efficiency. Thirteen isolates improved shoot dry weight (up to 65.8%) and shoot nitrogen concentration (up to 76%) compared with those of control treatments. Two isolates, 4 (CR42) and 22 (CR52), conferred higher symbiotic efficiency values of approximately 20%. Therefore, these two rhizobial isolates displayed the highest potential as beneficial inoculants to optimize the symbiotic efficiency for Cratylia and to increase the incorporation of nutrients and biomass into the productive system in the cerrado.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000901594
Editor: | Universidade Federal de Santa Maria
Relação: | 10.1590/0103-8478cr20151137
Formato: | text/html
Fonte: | Ciência Rural  v.46 n.9 2016
Fonte: | info:eu-repo/semantics/openAccess