Screening and Characterization of Stress Tolerant Rhizobia From Different Soils of Telangana

Abstract

Present in vitro experiment was carried out to identify plant growth promoting rhizobial isolates for abiotic stress tolerance. Rhizospheric soils from normal, salt affected, drought affected were collected from different places of Telangana state. From all soil samples, twenty one rhizobial isolates were collected. Among the twenty one isolates, eleven isolates were showed different plant growth promoting properties. The results of different in vitro abiotic stress tolerance of isolates reveals that, only one isolate showed tolerance to temperature from 20ºC-50ºC (YR-21), three isolates were showed tolerance to temperature from 20ºC -45ºC (RR-1, GR-5, GNR-8), one isolate was showed tolerance to temperature from 30ºC-45ºC (MR-11), only one isolate were showed tolerance to temperature from 30ºC -40ºC (ASR-17). Two isolates showed tolerance to water potential from -0.05 Mpa to-0.15 Mpa (RR-1, RR-3), three isolates were showed tolerance to water potential from -0.05 Mpa to -0.30 Mpa (GNR-8, ASR-19, YR-21), only one isolate showed tolerance to water potential at -0.05 Mpa (GNR-7).