Plant growth promotion and inhibitory potential of fluorescence (under UV light) exhibiting root endophytic bacteria isolated from Abelmoschus esculentus (Okra) cultivars
Gazala Amin, Srivathsa Nallanchakravarthula
Fluorescent Pseudomonads are known for the plant beneficial characters, but their potential is still unexplored. In the present study, root endophytic bacteria of Abelmoschus esculentus (Okra) cultivars ‘Geetanjali’, ‘OH-102’ and ‘Sangur’ showing fluorescence property on Kings B Agar (KBA) were isolated. They were further screened for their PGP and seed germination potential. Additionally, they were also tested for their inhibition potential against Escherichia coli, Pseudomonas aeruginosa, Proteus vulgaris and Staphylococcus aureus. The results indicated that, a cultivar effect for Fluorescent Pseudomonads in ‘Sangur’ cultivar. Isolates from Gitanjali (ORGT12, ORGT06, ORGT05) and OH102 (OROH12, OROH06, OROH05) cultivars were effective in inhibiting the four tested bacterial cultures. Isolate ‘ORGT12’ was shown to promote significant rate of seed germination (Abelmoschus esculentus 71%, Cyamopsis tetragonoloba 74%, Vigna unguiculata subsp. unguiculata 77%) among the tested isolates. Such potential isolates can be explored to reduce the microbial load on plants or their produce and as well as promote the plant growth.