Abstract：
:A soil bacterium, Bacillus subtilis, isolated from the rhizosphere of Chilli, showed high antagonistic activity against Colletotrichum gloeosporioides OGC1. A clear inhibition zone of 0.5-1 cm was observed in dual plate assay. Microscopic observations showed a clear hyphal lysis and degradation of fungal cell wall. In dual liquid cultures, the B. subtilis strain inhibited the C. gloeosporioides up to 100 % in terms of dry weight. This strain also produced a clear halo region on chitin agar medium plates containing 0.5 % colloidal chitin, indicating that it excretes chitinase. The strain also produced other mycolytic enzymes-glucanase and cellulase, demonstrated by a clear zone of hydrolysis of yeast cell wall glucan (YCW 0.1 % v/v) and carboxymethylcellulose (CMC 0.1 % v/v). In liquid cultures, the strain showed appreciable levels of chitinase, glucanase and cellulase activities and hydrolytic activity with C. gloeosporioides OGC1 mycelia as the substrate. The role of the B. subtilis strain in suppressing the fungal growth in vitro was studied in comparison with a UV mutant of that strain, which lacked both antagonistic and hydrolytic activity. The mycolytic enzyme mediated antagonism of B. subtilis was further demonstrated by heat inactivation (70-100 °C), treatment with trypsin and TCA of the crude enzyme extract which lacked antifungal property also. Treatment of the chilli seeds with Bacillus sp. culture showed 100 % germination index similar to the untreated seeds. The treatment of the seed with co-inoculation of the pathogen with Bacillus sp. culture showed 65 % reduction in disease incidence by the treatment as compared to the seed treated with pathogen alone (77.5 %).
journal_name
3 Biotechjournal_title
3 Biotechauthors
Ashwini N,Srividya Sdoi
10.1007/s13205-013-0134-4subject
Has Abstractpub_date
2014-04-01 00:00:00pages
127-136issue
2eissn
2190-572Xissn
2190-5738pii
10.1007/s13205-013-0134-4journal_volume
4pub_type
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