Abstract
Three bacterial strains (Pseudomonas species, P1; Pseudomonas mendocina, P2; andStenotrophomonas maltophilia, S3) were investigated in this study to assess their growth stimulatory effects on Triticum aestivum plants. These strains are Gram negative, motile, aerobic rods with catalase and oxidase positive. In general, seed inoculations of these bacteria (mono and mixed cultures) promoted germination, early growth parameters, auxin content, soluble protein content, peroxidase and acid phosphatase activity relative to non-inoculated control seedlings. Mixed cultures inoculations resulted in some decrease in various growth parameters. Almost 15 to 43% decrease in dry weight of plants was observed as compared to non-inoculated control. Bacterial inoculation (Pseudomonassp., P1) resulted in significantly higher acid phosphatase (40%) and peroxidase (39.7%)contents of plant when compared with non-inoculated control. Mixed culture combination showed pronounced synergistic effects relative to respective monocultures. Key words: Pseudomonas, Triticum aestivum, auxin, acid phosphatase, peroxidase,Stenotrophomonas.
Highlights
Increase in yield of vegetables, forage and grain crops with inoculation of diazotrophic rhizobacteria, has successfully been demonstrated (Bashan, 1998; Mekonnen et al, 2010)
The objective of the present study is to evaluate the impact of mono and mixed culture bacterial strains on the growth and biochemical parameters of Triticum aestivum seedlings
Reduction in dry weight per gram fresh weight of seedlings occurred in all bacterial inoculations
Summary
Increase in yield of vegetables, forage and grain crops with inoculation of diazotrophic rhizobacteria, has successfully been demonstrated (Bashan, 1998; Mekonnen et al, 2010). In plant-microbe interaction, root colonization by beneficial bacteria is the fundamental requirement (Bashan and Holguin, 1994; Qureshi and Sabri, 2011a, b). Azotobacter vinelandii produces two polymers: the extra cellular polysaccharide alginate and the intracellular polyester poly-ß-hydro butyrate (Castaneda et al, 2000). Alginate is important for cyst formation in A. vinelandii as a coating protective polysaccharide material (Nunez et al, 1999). It is suggested that cyst formation and colonization pattern play important roles in regulating nitrogenease activity of plants (Katupitiya et al, 1995)
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