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Cultivable bacteria isolated from apple trees cultivated under different crop systems: diversity and antagonist activity against colletotrichum gloeosporioides

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Cultivable bacteria isolated from apple trees cultivated under different crop systems: diversity and antagonist activity against colletotrichum gloeosporioides

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Título Cultivable bacteria isolated from apple trees cultivated under different crop systems: diversity and antagonist activity against colletotrichum gloeosporioides
Autor Passos, João Frederico Mangrich dos
Costa, Pedro Beschoren da
Costa, Murilo Dalla
Zaffari, Gilmar Roberto
Nava, Gilberto
Boneti, José Itamar da Silva
Oliveira, Andreia Mara Rotta de
Passaglia, Luciane Maria Pereira
Abstract 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.
Contido em Genetics and molecular biology. Ribeirão Preto. Vol. 37, n. 3 (Sept. 2014), p. 560-572
Assunto Colletotrichum gloeosporioides
Maça
[en] Antagonistic activity
[en] Apple tree
[en] Colletotrichum gloeosporioides
[en] Plant growth-promoting bacteria
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/114785
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