Isolation and functional characterization of plant growth promoting rhizobacteria against soft rot in Aloe vera (L)

Abstract

In the present investigation, 51 isolates of Pseudomonas fluorescens and 10 Bacillus subtilis isolates were isolated from the rhizosphere soil, collected from different Aloe vera growing areas of Southern Tamil Nadu and used for the screening of various functional characteristics against soft rot of Aloe vera. Among 51, five Pseudomonas fluorescens isolates can able to produce the siderophores. Isolate Pf 32 followed by Pf 45 produced the maximum quantity of salicylate type of siderophore. Isolates Pf 32 recorded maximum growth inhibition of E. chrysanthemi by production of volatile compounds. The maximum quantity of hydrogen cyanide (HCN) was recorded by isolates Pf 32 and Pf 45.