Title: Interactions of Azotobacter chroococcum, Azospirillum brasilense and Streptomyces mutabilis, in Relation to their Effect on Wheat Development
Abstract: Abstract Single or dual inoculation of wheat seedlings ( Triticum aestivum L. cv. Sakha 69) with Azotobacter chroococcum, Azospirillum brasilense or Streptomyces mutabilis in sterilized soil resulted in significant stimulation of their populations in the rhizosphere, compared with the initial values. Viable counts of Azospirillum and Azotobacter decreased in dual inoculations with Azotobacter or Streptomyces, and contrasted with those of Streptomyces, compared with the results of single inoculation. Single and dual inoculations stimulated plant growth, significantly increased the concentrations of indole‐3‐acetic acid (IAA), P, Mg, N and total soluble sugars (TSS) in wheat shoots. Soil content of N increased by single inoculation with Azotobacter and all dual inoculations. Soil‐IAA significantly increased by all inoculations. Growth of A. brasilense significantly inhibited by filtrates from 7‐day‐old cultures of S. mutabilis than from A. chroococcum, in vitro. The biosynthesis of antibacterial substance(s) by Azotobacter significantly decreased by supplementing their cultures with metabolic products from A. brasilense, but were stimulated by metabolic products from Streptomyces cultures. All metabolic products significantly decreased the growth of A, chroococcum, A. brasilense and S. mutabilis, nitrogen‐fixation and biosynthesis of IAA in A chroococcum, whereas biosynthesis of IAA stimulated in S. mutabilis. Most of the measured parameters after exposure to the tested bacteria or their metabolites were significantly correlated. The significance of IAA, nitrogen fixation and antibacterial substances, produced by such agronomically beneficial bacteria in early wheat growth is discussed.
Publication Year: 1995
Publication Date: 1995-09-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 53
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