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Role of plant growth promoting rhizobacteria and L-tryptophan on improvement of growth, nutrient availability and yield of wheat (Triticum aestivum) under salt stress

During the present study Pseudomonas sp and Bacillus cereus isolated from rhizospheric soil of halophytic weeds of Khewra salt range were used as bioinoculant on wheat. Aqueous solution of tryptophan was added to the rhizospheric soil @1ug/L after seed germination. Experiment was conducted at Quaid-i-Azam University Islamabad in pots under sterilized condition. Electrical conductivity (EC) was maintained to 3.7 dsm-1 by applying 150mM NaCl twice (after 7 and 14d of seed germination). PGPR inoculation significantly decreased EC, pH, SAR, Na, and Cl contents and improved K, Ca, Mg, Fe, P, NO3 and organic matter contents of the rhizospheric soil. Tryptophan addition assisted the PGPR to further decrease the EC, SAR and improved nutrients uptake and growth. Tryptophan augmented the PGPR-induced increase in fresh weight, chlorophyll, proline and sugar contents. Superoxide dismutase and peroxidase activities of leaves of inoculated plants were also higher in the presence of tryptophan. Greater production of abscisic acid and Indole acetic acid were recorded in leaves of PGPR inoculated plants and addition of tryptophan augmented the phytohormone production in leaves of treated plants. Inoculation of PGPR alone and with tryptophan positively affected the yield of crop by improving seed establishment and number of seeds/spike.

Role of plant growth promoting rhizobacteria and L-tryptophan on improvement of growth, nutrient availability and yield of wheat (Triticum aestivum) under salt

RESEARCH PAPER International Journal ong>ofong> Agronomy ong>andong> Agricultural Research (IJAAR) ISSN: 2223-7054 (Print) 2225-3610 (Online) http://www.innspub.net Vol. 4, No. 2, p. 30-39, 2014 OPEN ACCESS ong>Roleong> ong>ofong> ong>plantong> ong>growthong> ong>promotingong> ong>rhizobacteriaong> ong>andong> L-ong>tryptophanong> on improvement ong>ofong> ong>growthong>, nutrient availability ong>andong> yield ong>ofong> wheat (Triticum aestivum) under salt stress Tamoor-ul-Hassan * , Asghari Bano Department ong>ofong> Plant Sciences Quiad-i-Azam University, Islamabad 45320, Pakistan Article published on February 25, 2014 Key words: PGPR, L-ong>tryptophanong>, nutrient uptake, salt stress, Bacillus cereus. Abstract During the present study Pseudomonas sp ong>andong> Bacillus cereus isolated from rhizospheric soil ong>ofong> halophytic weeds ong>ofong> Khewra salt range were used as bioinoculant on wheat. Aqueous solution ong>ofong> ong>tryptophanong> was added to the rhizospheric soil @1ug/L after seed germination. Experiment was conducted at Quaid-i-Azam University Islamabad in pots under sterilized condition. Electrical conductivity (EC) was maintained to 3.7 dsm-1 by applying 150mM NaCl twice (after 7 ong>andong> 14d ong>ofong> seed germination). PGPR inoculation significantly decreased EC, pH, SAR, Na, ong>andong> Cl contents ong>andong> improved K, Ca, Mg, Fe, P, NO3 ong>andong> organic matter contents ong>ofong> the rhizospheric soil. Tryptophan addition assisted the PGPR to further decrease the EC, SAR ong>andong> improved nutrients uptake ong>andong> ong>growthong>. Tryptophan augmented the PGPR-induced increase in fresh weight, chlorophyll, proline ong>andong> sugar contents. Superoxide dismutase ong>andong> peroxidase activities ong>ofong> leaves ong>ofong> inoculated ong>plantong>s were also higher in the presence ong>ofong> ong>tryptophanong>. Greater production ong>ofong> abscisic acid ong>andong> Indole acetic acid were recorded in leaves ong>ofong> PGPR inoculated ong>plantong>s ong>andong> addition ong>ofong> ong>tryptophanong> augmented the phytohormone production in leaves ong>ofong> treated ong>plantong>s. Inoculation ong>ofong> PGPR alone ong>andong> with ong>tryptophanong> positively affected the yield ong>ofong> crop by improving seed establishment ong>andong> number ong>ofong> seeds/spike. * Corresponding Author: Tamoor-ul-Hassan tamoorqau80@gmail.com ul-Hassan ong>andong> Bano Page 30

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