Evaluation of some physiological parameters in homologous and heterologous association between wheat cultivars (Triticum aestivum L.) and Azospirillum brasilense

One way to improve the quantity and quality of wheat production is to use homologous bacterial strains of Azosprillum brasilense. To determine homologous strains, evaluation of growth parameters and defence indexes is essential. This study was conducted to determine a homologous association system using combination of six cultivars of wheat native to Iran named Omid, Sardari, Roshan, Shoaleh, Tabasi and Shahpasand with two bacterial strains (Sp7and Sp245) of A. brasilense with 107 CFU ml-1. The plant samples of 10 days-old were obtained for growth and biochemical analysis. The results show that the average measured indexes such as dry weight, maximum shoot length, root length, number of roots and their branches, protein, Tyrosine ammonia lyase and Phenylalanin ammonia lyase activities were increased due to inoculation of wheat with Sp7 and Sp245 except for prolin. All measured indexes were higher in Sp245 compared to Sp7. The best combination was Roshan-Sp245 associated system with several folds higher in average values as compared to other combinations.