Evaluation of plant growth promoting traits of thermotolerant rhizobacteria from mungbean rhizosphere
DOI:
https://doi.org/10.59797/journaloffoodlegumes.v30i4.467Keywords:
Flavonoid, HCN, Indole Acetic Acid, SiderophoreAbstract
Plant growth promoting rhizobacterial (PGPR) colonize the root and enhance plant growth through multifarious activities. A total of 20 rhizobacterial isolates were isolated at 35 and 40°C from 12 soil samples taken from different locations of mungbean rhizospheric soil. Five isolates showing maximum growth at 35° and 40° C were selected and characterized and found as belonging to genera Bacillus and Rhizobium. IAA production ranged from 0.35-17.08 ìg/ ml and 0.70-31.32 ìg/ml in the presence of tryptophan at 35° and 40°C respectively. Isolates S-11 and R-6 were found to be strong producer of HCN at 40°C. Maximum siderophore production was observed with isolate R-6 at 35 and 40°C as evident by the halo on CAS agar and highest catechol type siderophores was produced by R-6 (72.37 μg/ml) followed by S-11 (72.27 μg/ml) at 40°C.Catechol type siderophore at 35°C by R-6 (71.88 μg/ml) was higher in comparison to S-11 (63.08 μg/ml.). Potent isolates were found to produce flavonoidlike compounds and exhibited biofilm formation.
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