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Plant growth promoting properties of rhizobacteria isolated from wheat and pea grown in loamy sand soil

Microbes are important catalysts to regulate functional properties of terrestrial ecosystems. In this study, rhizosphere and phyllosphere bacteria were isolated from wheat and peas and examined for their plant growth promoting properties. The effects of bacterial inoculants on the growth of peas and wheat were studied in a series of pot experiments using loamy sand soil. | Turk J Biol 32 (2008) 9-15 © TÜB‹TAK Plant Growth Promoting Properties of Rhizobacteria Isolated from Wheat and Pea Grown in Loamy Sand Soil Dilfuza EGAMBERDIEVA Department of Biotechnology and Microbiology, National University of Uzbekistan, Vuzgorodok, 100174 Tashkent, UZBEKISTAN Received: 23.03.2007 Abstract: Microbes are important catalysts to regulate functional properties of terrestrial ecosystems. In this study, rhizosphere and phyllosphere bacteria were isolated from wheat and peas and examined for their plant growth promoting properties. The effects of bacterial inoculants on the growth of peas and wheat were studied in a series of pot experiments using loamy sand soil. The results showed that the colonisation of bacteria was higher in the rhizosphere as compared to the phyllosphere of both plants. Bacterial strains were identified as Pseudomonas, Bacillus, Kocuria, and Microbacterium, and Cellulomonas species. The response of wheat and peas when inoculated with bacteria was significantly positive over the control. After inoculation with effective bacterial strains, the root and shoot growth, and nodulation of peas were increased. However, the strains stimulated only the roots of wheat. Independent of the origin (rhizosphere vs. phyllosphere), bacterial strains produced indole-3 acetic acid (IAA), which most probably accounted for the overall synergistic effect on growth of peas and wheat. Key Words: Rhizosphere, phyllosphere, auxin, wheat, peas T›nl› Topraklarda Yetiflen Bu¤day ve Bezelye Bitkisinden ‹zole Edilen Rhizobakterilerin Bitki Büyüme Uyar›c› Özellikleri Özet: Karasal ekosistemlerin fonksiyonel özelliklerini düzenlemede mikroplar önemli katalistlerdir. Bu çal›flmada bu¤day ve bezelyeden izole edilen rhizosfer ve phyllosfer bakterileri bitki büyümesini uyar›c› özellikleri çal›fl›lm›flt›r. Bu¤day ve bezleyelere bakteri ›nokulasyonlar›n›n etkileri bir seri saks› denemesinde t›nl› kumlu topraklarda çal›fl›lm›flt›r. Sonuçlara gore her bitki .