Cultivable bacteria isolated from apple trees cultivated under different crop systems: Diversity and antagonistic activity against Colletotrichum gloeosporioides

AUTOR(ES)

Passos, João Frederico M. dos, Costa, Pedro B. da, Costa, Murilo D., Zaffari, Gilmar R., Nava, Gilberto, Boneti, José Itamar, Oliveira, Andréia Mara R. de, Passaglia, Luciane M.P.

FONTE

Genet. Mol. Biol.

DATA DE PUBLICAÇÃO

2014-09

RESUMO

This study evaluated the diversity of cultivable plant growth-promoting (PGP) bacteria associated with apple trees cultivated under different crop management systems and their antagonistic ability against Colletotrichum gloeosporioides. Samples of roots and rhizospheric soil from apple trees cultivated in organic and conventional orchards in southern Brazil were collected, together with soil samples from an area never used for agriculture (native field). Bacteria were identified at the genus level by PCR-RFLP and partial sequencing of the 16S rRNA, and were evaluated for some PGP abilities. The most abundant bacterial genera identified were Enterobacter (27.7%), Pseudomonas (18.7%), Burkholderia (13.7%), and Rahnella (12.3%). Sixty-nine isolates presented some antagonist activity against C. gloeosporioides. In a greenhouse experiment, five days after exposure to C. gloeosporioides, an average of 30% of the leaf area of plants inoculated with isolate 89 (identified as Burkholderia sp.) were infected, whereas 60 to 73% of the leaf area of untreated plants was affected by fungal attack. Our results allowed us to infer how anthropogenic activity is affecting the bacterial communities in soil associated with apple tree crop systems, and to obtain an isolate that was able to delay the emergence of an important disease for this culture.

Documentos Relacionados

• MORPHOLOGICAL, MOLECULAR AND PATHOGENIC CHARACTERIZATION OF Colletotrichum gloeosporioides ISOLATED FROM MANGO
• Plant-Dependent Genotypic and Phenotypic Diversity of Antagonistic Rhizobacteria Isolated from Different Verticillium Host Plants
• Molecular Analysis in the differentiation of Colletotrichum gloeosporioides isolates from the cashew and mango trees
• Synthesis and Evaluation of the Fungal Activity of New Pyrazole-Carboxamides against Colletotrichum gloeosporioides
• Infecção e colonização de goiabas por Colletotrichum gloeosporioides e Colletotrichum acutatum sob diferentes temperaturas e períodos de molhamento