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Eficiência de rizobactérias Bacillus spp. no controle in vitro de Macrophomina phaseolina agente etiológico da podridão de tronco da mamona (Ricinus communis L).

Marroni, Igor Villela and Germani, José Carlos (2011) Eficiência de rizobactérias Bacillus spp. no controle in vitro de Macrophomina phaseolina agente etiológico da podridão de tronco da mamona (Ricinus communis L). [Efficiency of rhizobacteria Bacillus spp. in the control of Macrophomina phaseolina in vitro agent of stem rot of castor bean (Ricinus communis L).] Revista Brasileira de Agroecologia, 6 (3), pp. 159-167.

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Online at: http://www.aba-agroecologia.org.br/ojs2/index.php/rbagroecologia/article/view/9983/pdf_1

Summary

O presente trabalho teve como objetivo avaliar a eficiência no controle do fungo Macrophomina phaseolina, através de isolados de bactérias do gênero Bacillus, isoladas da rizosfera e do rizoplano de mamonas selvagens e da cultivar (não identificada). Os isolados foram avaliadas em pareamento com o patógeno Macrophomina phaseolinae: seu efeito por antibiose, produção de metabólitos voláteis e inibição de bactérias de mesmo gênero. Os isolados selvagens mostraram-se mais eficientes para o controle da Macrophomina phaseolina. A cepa RZ 1, isolada de mamoneira selvagem inibiu o desenvolvimento do fungo em 9%, por meio do pareamento. A cepa RZ 2, também isolado selvagem, conseguiu inibir o crescimento do fungo em 24%, por meio de seus metabólitos não voláteis, bactérias isoladas da cultivar mostraram 23% e 21% de inibição com os isolados RZE 4 e RP 2, respectivamente. A produção de metabólitos voláteis mostrou-se eficiente com o isolado RP 5, sendo fungistático, os microrganismos RPE 4, RZE 4 e RPE 5 pela redução na produção de conídios. Apenas as cepas RP1, a RZ 2 e a RPE 9 mostraram inibir isolados do mesmo gênero, o presente trabalho mostra que bactérias selvagens são melhores antagonista que as obtidas de cultivar.

Summary translation

This study aimed to evaluate the efficiency in controlling the fungus Macrophomina phaseolina by Bacillus strains isolated from the rhizosphere and rhizoplane of wild and cultivate castor bean. The strains were evaluated in pairing with the pathogen Macrophomina phaseolina isolated in Pelotas (RS), and also antibiosis, and inhibition of bacteria of the same gender. Wild strains were more effective for control of the pathogen in paired isolates from wild castor bean inhibited fungal growth more efficiently and RZ 1 a strain that could further inhibit the fungus, decreasing by 9% its development, other strains of proved niche with similar efficiency. The strain RZ 2, another isolate wild, managed through its metabolites inhibit the growth of the fungus in 24%, in this test strains isolated from cultivar had satisfactory results by inhibiting the fungus in 23 and 21% of the strains RZE 4 RP2 respectively. The isolates obtained good results for the production of volatile metabolites and strains RP 5 was fungistatic and strains as RPE 4, and RZE 4, RZE 5 reduced the number of conidia. Few bacteria were able to inhibit the indicator microorganism of the same gender, like RP1, RZ 2 and RPE 9. As the results show bacteria of the genus Bacillus are effective in controlling this pathogen mainly when isoled fron wild environment.

EPrint Type:Journal paper
Keywords:Pareamento, Antibiose, Metabólitos voláteis. Pairing, Antibiosis, Volatile metabolites.
Agrovoc keywords:
LanguageValueURI
Englishagroecologyhttp://aims.fao.org/aos/agrovoc/c_92381
EnglishAntibiosishttp://aims.fao.org/aos/agrovoc/c_29117
Englishrhizobacteriahttp://aims.fao.org/aos/agrovoc/c_25068
EnglishBacillushttp://aims.fao.org/aos/agrovoc/c_760
EnglishMacrophomina phaseolinahttp://aims.fao.org/aos/agrovoc/c_23945
EnglishRicinus communishttp://aims.fao.org/aos/agrovoc/c_6600
Subjects: Farming Systems
Farming Systems > Social aspects
Research affiliation: Brazil > Other organizations
ISSN:1980-9735
Related Links:http://www.aba-agroecologia.org.br/ojs2/index.php/rbagroecologia
Deposited By: Pinto, Gabriela Franco
ID Code:22993
Deposited On:09 Sep 2013 19:25
Last Modified:09 Sep 2013 19:25
Document Language:Portuguese/Portugues
Status:Published
Refereed:Peer-reviewed and accepted

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