Growth, photosynthesis, nodule nitrogen and carbon fixation in the chickpea cultivars under salt stress

摘要: Four cultivars of chickpea, two them Mediterranean origin (kabuli), CSG 9651, BG 267 and Indian (desi) types, 8962, DCP 92-3, differing in their salt sensitivities were identified after screening ten genotypes saline soils. The 9651 8962 tolerant while 92-3 sensitive, respectively. seeds different inoculated with Mesorhizobium ciceri, strain F: 75 the plants grown greenhouse. After establishment symbiosis, 15-day-old seedlings administered doses at varying concentrations (0, 4, 6, 8 dSm-1 NaCl, Na2SO4, CaCl2). Plants harvested 40, 70 100 days sowing, for analyses. main aim was to compare relative tolerance both desi kabuli terms nitrogen fixation carbon metabolism, as well ascertain whether negative effects stress on due a limitation photosynthate supply nodule or nodular metabolism that sustains nitrogenase activity. Plant growth, nodulation activity more severely affected under salinity treatments (6 dSm-1) compared 8962. Nodule number mass increased which might be responsible higher fixation. Salinity reduced leaf chlorophyll Rubisco activities all cultivars. However, showed smaller declines than sensitive ones. Phosphoenolpyruvate carboxylase (PEPCase) significantly nodules harvests, this clearly related concentrations. Our results suggest salt-affected soils have efficient support rates symbiotic