Nitrogen fixation in tropical environments-Adaptive responses and benefits

作者：Sheokand Sunita^*; Dudeja S S; Swaraj K

来源：Research on Crops, 2012, 13(2): 743-753.

• Drought
• nitrogen fixation
• nutrient deficiency
• salt stress
• temperature stress
• tropics

It is widely recognized that biological nitrogen fixation (BNF) by legume-rhizobium symbiosis is an important component of productivity in tropical agriculture. Nitrogen fixation is strongly influenced by the environmental conditions such as salt stress, drought stress, acidity, alkalinity and nutrient deficiency. These major stress factors suppress the growth and symbiotic characteristics of most rhizobia; however, several strains, distributed among various species of rhizobia, are tolerant to stress effects. Some strains of rhizobia form effective (N-2-fixing) symbioses with their host legumes under salt, temperature and water stress. The effect of these conditions on the nitrogen fixation system and the adaptive responses have been reviewed. In addition to their N-2-fixing capacity legumes are extremely important in human and animal diets. Globally, they supply 33% of human protein, and some are important sources of oil. Other legumes provide unique phytochemicals which have industrial and medicinal uses. The rhizobium legume symbiosis also plays an important role in phytoremediation.

• 出版日期2012-8