Abstract
Root nodules of legume plants are devoted for hosting endophytic symbiotic bacteria that fix atmospheric nitrogen but recently proved as a niche for various non-rhizobial endophytes (NRE) also. In the present investigation, one rhizobial and two NRE were isolated and characterized as Rhizobium sp. AAU B3, Bacillus sp. AAU B6 and Bacillus sp. AAU B12. These isolates were studied for in vitro biocontrol activity against two pathogenic fungi. NRE isolates exhibited antifungal activity against root rot causing Macrophomina phaseolina (ITCC-6749) isolated from Vigna radiata and wilt causing pathogen Fusarium udum Butler isolated from Cajanus cajan in liquid as well as on solid medium. Furthermore, their antagonism was increased markedly when combined with Rhizobium sp. Moreover, Bacillus sp. AAU B6 showed amplification of the zwittermicin A gene (~ 950 bp) which is evident for the production of antibiotics. All three isolates showed HCN production in vitro also, Bacillus sp. AAU B12 exhibited amplification of its gene hcnC. Pathogenic fungal hyphae became thin, transparent, and bent as well as fungi lost their normal growth and branching patterns when exposed to volatile compounds produced by NRE. All the 3 isolates produced siderophores, however siderophore production was increased considerably when all three strains are mixed together. Furthermore, all the three isolates produced cell wall degrading enzymes (chitinase, protease, and cellulase) but lipolytic activity was exhibited only by Rhizobium sp. AAU B3. When NRE inoculated in combination of Rhizobium; overcomes the disease severity against M. phaseolina under pot study. Thus, from present study it is concluded that co-inoculation of NRE and Rhizobium sp. can be exploited as biocontrol bio-agents against M. phaseolina in green gram at field levels.
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Authors are thankful to Department of science and technology for providing financial assistance via INSPIRE Fellowship during the research at Anand Agricultural University, Anand.
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Dhole, A., Shelat, H. Non-Rhizobial Endophytes Associated with Nodules of Vigna radiata L. and Their Combined Activity with Rhizobium sp.. Curr Microbiol 79, 103 (2022). https://doi.org/10.1007/s00284-022-02792-x
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DOI: https://doi.org/10.1007/s00284-022-02792-x