Abstract
Management of drought stress through application of plant growth promoting rhizobacteria (PGPR) is now considered as an effective strategy in the present scenario of altered environmental conditions of the world. The aims and objectives of the present investigation was isolation, characterization and identification of some potential microbial resources (PGPR) from drought-affected upland rice fields of South Bengal followed by experimentation on the effect of isolated PGPR on drought induced rice seedlings. Selected isolates were isolated from rice field rhizospheric soils and tested for their PGPR activity, through phosphate solubilization, nitrogen fixation, IAA production and ACC deaminase activity. Then, the selected isolates were identified through 16S rDNA sequencing and phylogenetic analysis. Among the screened isolates two (isolate 1 and isolate 6) showing plant growth promoting traits, was applied on studied germplasm (IR64) to find out the influence of the applied organisms on rice growth and development under induced drought. Both organisms showed a positive influence (through increase in germination percentage, root growth, shoot growth, fresh weight and dry weight) on the studied rice growth and development under induced drought. Isolate 1 and 6 identified as species of Mycobacterium sp and Bacillus sp respectively through molecular taxonomy. Hence, these two isolates are expected to alleviate drought stress in the rice field for their nature of plant growth promotion under drought stress.
Highlights
Among the different abiotic factors, drought is one of the major constraints that adversely affect rice plant’s growth and productivity worldwide and it is expected that drought will hamper rice production in more than 50% of the arable lands by 2050 [1]
Selected isolates were isolated from rice field rhizospheric soils and tested for their plant growth promoting rhizobacteria (PGPR) activity, through phosphate solubilization, nitrogen fixation, Indole acetic acid (IAA) production and 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase activity
Comparative IAA production ability of the two isolates is presented in Fig. 4 where Isolate 1 (I 1) showed 1287.5 mmole/h/mg and isolate 6 (I 6) showed 1212.5 mmole/h/
Summary
Among the different abiotic factors, drought is one of the major constraints that adversely affect rice plant’s growth and productivity worldwide and it is expected that drought will hamper rice production in more than 50% of the arable lands by 2050 [1]. Decrease in arable lands due to urbanization and constant increasing global warming makes the situation more adverse [2]. A variety of strategies has been used to improve the drought tolerance of rice like conventional stress management, different breeding approaches, genetic engineering etc. Use of PGPR in relation to stress management is one of them. It is one of the recently employed strategy
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