PLANT GROWTH PROMOTING CHARACTERISTICS OF NON-RHIZOBIAL STRAINS ISOLATED FROM ROOT NODULES OF VIGNA TRILOBATA CULTIVARS
Journal Title: International Journal of Agricultural Science and Research (IJASR) - Year 2017, Vol 7, Issue 2
Abstract
Rhizobacterial strains were isolated from root nodules of Vigna trilobata plants raised in soils collected from four geographically different areas in A.P. India. The strains were identified by 16Sr DNA analysis as Bacillus altitudinis MRR 122 (KF 621021), Enterobacter cloacae MRR 127 (KF 621020), Mycobacterium wolinskyi MRR 120 (KF 621019) and Paenibacillus sp. strain MRR 124 (KF 621017). These are the first reported non rhizobial strains associated with root nodules of V. trilobata. The strains were biochemically characterized and plant growth promoting activities (PGP) viz., IAA, EPS, Siderophore and HCN production were studied. All the four non rhizobial strains showed IAA and EPS production. Among them maximum IAA production was observed in Bacillus altitudinis MRR 122 (35µg/ml) followed by Enterobacter cloacae MRR 127 (30 µg/ml). Paenibacillus sp. strain MRR 124 and Mycobacterium wolinskyi MRR 120 produced 27 µg/ml and 25 µg/ml of EPS respectively. All the strains produced copious amount of EPS in the range of 631-690 mg/ml. Only two strains, Bacillus altitudinis MRR 122 and Paenibacillus sp. MRR 124 showed positive results for siderophore and HCN production. From the results it is evident that non rhizobial strains Bacillus altitudinis and Paenibacillus sp. from root nodules of V. trilobata, with better PGP activities can be exploited as bioinoculants for biofertilizer production.
Authors and Affiliations
G. KRANTHI KUMAR, M. RAGHU RAM
Keywords
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