Characterization of Plant Growth Promoting Rhizobacteria From Seasonal Flower Beds

The present investigations were carried out to screen the PGPR isolates from five separate seasonal flower beds (Catharanthus roseus, Portulaca grandiflora, Celosia argentea, Gomphrena globosa and Impatiens balsamina) of Curzon Hall, University Dhaka. bacterial load collected soil samples ranged in between 7.60 ± 6.01 × 106 9.49 5.44× 108 cfu/g, 5.34 4.06×106 13.4 4.8×106 cfu/g 1.01 0.59×106 1.19 0.95×108 on Nutrient Agar (NA), Luria-Bertani (LB) Yeast Extract Mannitol (YEMA), respectively. All selected eight Gram positive rod shaped. found be IAA producer 7 showed varying levels phosphate solubilizing activity. production (P) solubilization 9.76 5.98 17.99 1.865 U/ml, 1.17 0.59 1.84 0.499 mg/l. Maximum both was achieved 24h incubation period at 37°C pH 7.0. Germination test against Mung Bean (Vigna radiata) revealed plant growth promoting activities could used as inoculant. Dhaka Univ. J. Biol. Sci. 31(2): 321-328, 2022 (July)