Nadiya Hasan and Suchit A John

Abiotic stress is one of the most important problems currently faced by agriculture. Plants respond and adapt to a variety of environmental stresses in order to survive. Among these Salinity is one major limiting factor to plant growth and crop productivity. The aim of the study reported here to evaluate the effect of PGPR inoculation in a saline environmental conditions and on enhancement of the growth and yield of tomato under saline field condition. To determine the effect of PGPR two consecutive field experiment was conducted. Tomato seeds were inoculated with the five pre-isolated strains of PGPR (Bacillus subtelis, Pseudomonas fluorescens, Azospirullus, Azotobacter Pseudomonas putida) sown and irrigated at different saline (NaCl) concentration (50mM, 100mM, 150mM, 200mM).the results showed that among these PGPR Pseudomonas putida containing ACC deaminase activity and exhibited the best ability to enhance the plant height no of leaves, no of branches, leaf area index compare to control (non-treated). Bacillus subtelis had significant effect on improving chlorophyll and carotenoid content under 150mM concentration of saline. Higher the dose of saline stress which is 200mM exhibited the suppress growth indices compare the control as well as the inoculated treatments. Moreover the root length, shoot length had significantly improved by the inoculation of Pseudomonas putida under different saline concentration. So that our study had suggested that Pseudomonas putida are consider the most capable PGPR strain which are suited for applied as alleviation tools under saline condition. This PGPR had promote growth indices and stress tolerance to the selected tomato plants which may be gives further varying growth indices under different stress condition as well as in different environmental condition.

DOI: 10.22271/phyto.2024.v13.i3b.14948

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