The effect of salinity on N fixation and assimilation in Vicia faba
1994
Cordovilla, M.P. | Ligero, F. | Lluch, C.
Production of the faba bean in semi-arid and coastal areas may be limited by the salt sensitivity of faba bean symbiosis. Accordingly, this study was done to analyse the effects of salt on the effective symbiosis of faba bean (Vicia faba L. var. minor cultivar Alborea) and salt-tolerant Rhizobium leguminosarum biovar. viciae strain GRA19. After 4 weeks of growth, the nutrient solutions were supplemented with 50, 75 and 100 mM NaCl for 21 d. Plants were harvested four times at weekly intervals, beginning at 4 weeks. Vicia faba tolerated low (50 mM NaCl) but not higher levels (75 and 100 mM NaCl) of salt stress. Salinity affected shoot growth more than root growth. At the end of the culture, the total nitrogen content in the shoot was affected more than plant growth; conversely, in the root, growth was influenced more than total nitrogen content. In nodules, nitrogen fixation (acetylene reduction activity) was more sensitive to salinity than ammonium assimilation {glutamine synthetase and glutamate synthase).
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