Atuação de rizóbios com rizobactéria promotora de crescimento em plantas na cultura do caupi (<em>Vigna unguiculata</em> [L.] Walp.)

Abstract

RESUMO.O objetivo deste estudo foi verificar a potencialidade da colonização conjunta em feijão caupi (Vigna unguiculata [L.] Walp.) por Paenibacillus e Bradyrhizobium em diferentes métodos de inoculação que proporcionam crescimento visando a uma agricultura sustentável. Os trabalhos foram realizados na Empresa Pernambucana de Pesquisa Agropecuária (IPA), com Argissolo Amarelo (Itapirema, Estado de Pernambuico), dois modos de inoculação (semente e solo) em cultivar de caupi (IPA-205). Foi determinado: número e matéria seca dos nódulos; matéria seca da parte aérea (MSPA) e raiz (MSR); relação MSPA/MSR; Nitrogênio acumulado na MSPA; altura da planta. As estirpes de rizóbios apresentaram comportamento instável nos diferentes métodos de inoculação. A eficiência simbiótica da colonização conjunta do sistema radicular por Paenibacillus e as estirpes de Bradyrhizobium nos diferentes métodos de inoculação apresentou-se variável. Os benefícios têm sido aqui evidentes e os fatos informados na literatura podem direcionar futuros estudos que ajudem a explicar os comportamentos acima relatados sobre diferentes mecanismos de ação de cada célula bacteriana. ) for Paenibacillus and Bradyrhizobium, using different inoculation methods to provide growth, seeking a maintainable agriculture. The study was carried out at Empresa Pernambucana de Pesquisa Agropecuária, in Yellow Argisol (Itapirema, Pernambuco State). Two methods of inoculation (seed and soil) in cowpea crop (IPA-205) was used. The following aspects were evaluated: number and dry matter nodule; shoot dry matter (SDM) and root (RDM); relation SDM/RDM; nitrogen accumulated in the SDM and plant height. The rhizobial strains showed low stability in the different inoculation methods. The symbiotic efficiency of the cocolonization for Paenibacillus and the Bradyrhizobium strains in the different inoculation methods were variable. Results showed that the benefits here are evident. And, this literature review can address future studies aiming to explain the behaviors mentioned above under different mechanisms of action of each bacterial cell.

Plant Growth Promoting Rhizobacteria: Fundamentals and Applications

“…During the past couple of decades, the use of plant growth promoting rhizobacteria (PGPR) for sustainable agriculture has increased tremendously in various parts of the world. Significant increases in growth and yield of agronomically important crops in response to inoculation with PGPR have been repeatedly reported (Kloepper et al 1980;Seldin et al 1984;Chen et al 1994;Zhang et al 1996;Amara and Dahdoh 1997;Chanway 1998;Pan et al 1999;Bin et al 2000;Gupta et al 2000;Biswas et al 2000;Mariano and Kloepper 2000;Asghar et al 2002;Vessey 2003;Gray and Smith 2005;Silva et al 2006;Figueiredo et al 2008;Araújo 2008). Studies have also shown that the growth-promoting ability of some bacteria may be highly specific to certain plant species, cultivar and genotype (Bashan 1998;Gupta et al 2000;Lucy et al 2004).…”

“…Coinoculation studies with PGPR and Rhizobia have shown increased plant nodulation and N fixation (Li and Alexander 1988;Araújo and Hungria 1999;Vessey and Buss 2002;Silva et al 2006;Figueiredo et al 2007). Coinoculation of some Bacillus strains with effective Bradyrhizobium resulted in enhanced nodulation and plant growth of green gram (Vigna radiata L.) (Sindhu et al 2002).…”

Trends and Prospects of Microbial Diversity in Rhizosphere

“…PGPR therefore, also aimed to investigate in relation to available plant essential nutrient in soil (Freitas et al 2007). Significant increase in growth and yield of important crops in response to inoculation with PGPR have been repeatedly reported (Kloepper et al 1980;Chen et al 1994;Zhang et al 1996;Amara and Dahdoh 1997;Pan et al 1999;Gupta et al 2000;Mariano and Kloepper 2000;Asghar et al 2002;Vessey 2003;Gray and Smith 2005;Silva et al 2006;de Araujo 2008). On the other hand, bacteria in the genera Bacillus, Streptomyces, Pseudomonas, Burkholderia, and Agrobacterium are the biological control agents suppress plant disease through production of antibiotics, enzymes and/or siderophores and ISR Uppal et al 2008).…”

Amazing Multiple Function Properties of Plant Growth Promoting Rhizobacteria in the Rhizosphere Soil

“…Significant increases in growth and yield of agronomically important crops in response to inoculation with PGPR have been reported many times (Kloepper et al, 1980;Chen et al, 1994;Zhang et al, 1996;Amara and Dahdoh, 1997;Chanway, 1998;Pan et al, 1999;Bin et al, 2000;Biswas et al, 2000;Asghar et al, 2002;Vessey, 2003;Silva et al, 2006). PGPR beneficial effects have been exploited in many areas including biofertilizers, microbial rhizoremediation and biopesticides (Adesemoye et al, 2008) …”