الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The presnet investigation is a geneticaI study on nitrogen fixation and its reguIation in R. trifoIii and R. meIiIoti through; mutation (induced by acrifIavine and diethy Iamine ), intra- and interspecific hybridization between different mutants of the two species aiming to increase the effecincy of nitrogen fixation and deter- mine the possibiIity of changing host specificity. ResuIts obtained couId be summarized as foIIows:
1- Acriflavine was found to affect ratios of survivors in R.
2- The characterized mutants of R. trifolii.