Bioefficacy of endophytic actinomycetes for plant growth promotion and management of fungal diseases in vegetables
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Date
2019
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Punjab Agricultural University, Ludhiana
Abstract
Endophytic actinomycetes are associated with internal tissues of plants without any disease symptoms and are promising source of novel secondary metabolites. The present study was conducted with a view to screen endophytic actinomycetes from four vegetable crops (Solanum lycopersicum, Capsicum annum, solanum tuberosum and Cucumis melo) and evaluate their potential to produce plant growth promoting and biocontrol agents. A total of 240 isolates were isolated from roots, stems and leaves tissues of vegetables and presumptively identified as identified as Streptomyces sp. (n=163), Micromonospora sp. (n=25), Microbispora sp. (n=11), Actinopolyspora sp. (n=4), Sacchropolyspora sp. (n=8), Nocardia sp. (n=22) and Psuedonocardia sp. (n=7). The functional potentialities of the isolates recorded were phosphate solubilization, siderophore, IAA, gibberallic acid and ammonia production. Streptomyces fulvissimus (TR60), a Solanum lycopersicum isolate exhibited maximum phosphate solubilization activity (32.42 mg/100ml) while Streptomyces flavoviridis (PS53), a Solanum tuberosum isolate showed high yield of IAA (132.74 μg/ml). Streptomyces diastaticus subsp. Ardesiacus (CR36), a Capsicum annum isolate exhibited maximum siderophore production: catechols 147.3 μg/ml and hydroxamate 129.4 μg/ml. Eighty isolates out of 240 displayed [S.lycopersicum (n=21), C.annum (n=15), S.tuberosum (n=20) and C. melo (n=24)] activity against different plant pathogenic fungi (Fusarium oxysporum, R. solani, Pythium sp. and Sclerotium rolfsii) In present study, field trial conducted with these potential isolates based on results of in vitro plant growth promoting traits and also offered protection against fungal diseases under controlled glass house condition besides stimulating plant growth.
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