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PJB-2020-209

Evaluation of Indole-3-acetic acid deficient mutants of Pseudomonas moraviensis and its role in mitigation of salt stress in Cicer Arietinum L.

Sadia Zafar, Asghari Bano and Tamoor Ul Hassan
DOI:10.30848/PJB2022-2(6)


Abstract

Present investigation aims to characterize Pseudomonas moraviensis (wild type) and its IAA-deficient mutants and further to evaluate their role on physiology of chickpea plants (Cicer arietinum L.) under induced salt stress. Extracellular and whole cell protein contents as well as proline production in the M9 media and M9 media containing 4% NaCl of wild type of P. moraviensis and its mutants were determined. The functional group of PGPR both wild type and mutants were determined by Fourier transform infrared spectroscopy analyses (FTIR) of the culture. A significant increase (62-293%) was found in most of the mutants in the extracellular protein and whole cell protein (45-304%) than that of wild type. P. moraviensis wild type and its mutants had increase in the salt tolerance potential with time up to 75 mM NaCl treatments. Mutants exhibited higher tolerance to NaCl applied. Mutants convert tryptophan to IAA, 61-92% lower than that of the wild type. The plants inoculated with wild type showed increased chlorophyll, protein contents, proline contents and enhanced the peroxidase and superoxide dismutase. Some mutants produce proline much higher as compared with wild type under unstressed and salt stress. Mutants lower in proline production induce higher SOD activity is host plants but decrease the catalase activity as than that of the wild type. Thus it is concluded that the difference in the response of mutants may be attributed to the difference in their FTIR spectra and their ability of extracellular protein production.  

To Cite this article: Zafar, S., A. Bano and T.U. Hassan. 2022. Evaluation of Indole-3-acetic acid deficient mutants of Pseudomonas moraviensis and its role in mitigation of salt stress in Cicer Arietinum L. Pak. J. Bot., 54(1): DOI: http://dx.doi.org/10.30848/PJB2022-2(6)  
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