الفهرس 
INTRODUCTION
Importance of Biological Nitrogen Fixation by LegumesOnly 14 pages are availabe for public view
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Abstract
Impact of harsh environmental conditions play an essential role in the control of legume-rhizobia interactions. These factors can arrest the growth, multiplication and survival of rhizobia in soil rhizosphere. The harsh environmental conditions may also have depressive effect on the steps involved in legume-Rhizobium symbiosis such as molecular signaling, infection process, nodule development and function, resulting in low nitrogen fixation and crop yield. So, this investigation was conducted to study stress factors in soils that influence rhizobial growth, nod gene expression, symbiotic nitrogen fixation, plant growth and determine whether the addition of the combination of hesperetin and apigenin (a nod gene inducer) to R. tibeticum inocula could overcome the stressful effects of salinity and heavy metals contaminations (Ni and Co) on nodulation, nitrogen fixation and growth of plant.