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Abstract
The objectives of the present study were screening and identification of plant growth promoting, rhizobacteria (PGPR) isolated from the rhizosphere of agriculturally important nine field grown crops cultivated at different sites in Ismailia, Port-Said and Suez Governorates for using them as biofertilizers. The ability of the selected PGPR for solubilization of inorganic phosphates, production of siderophores and auxins (indole acetic acid, IAA) was also studied.
Of a total of 477 bacterial cultures isolated from the rhizosphere soil samples, 81 were purified and then identified. It could be recognized and identified 9 PGPR genera. They are Enterobacter, Pseudomonas, Xanthobacter, Serratia, Azospirillum, CelIvibrio, Xanthomonas, Micrococcus and Bacillus. The tested PGPR varied greatly in their efficiency for. producing IAA equivalents and siderophores and solubilising of inorganic phosphates’.
Growth and yield ’of wheat and faba bean plants, were stimulated by application of PGPR, but more response was observed in case of faba bean plant where the average increases over the uninoculated control were 105.2, 31.9 and 56.8%.for straw, seeds and total (straw plus seeds) yields, respectively. However the corresponding average increases in case of wheat plant were lower, being 3 9.9, 29.8 and 35.3% for straw. grains and total yields. respectively. Highly significant positive linear correlations were, found between auxin production by the tested bacterial isolates and each of straw and grain yields as well as total yield of wheat.
The results of this study indicated highly beneficial effects of PGPR application to faba bean and wheat as examples of leguminous and cereal crops, respectively under greenhouse conditions. The tested. PGPR are recommended for field evaluation under different, soils and environmental conditions before being generalized and adopted in a bi64arming system.