Effect of nitrogen source and salinity level on salt accumulation of two chickpea genotypes
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This study aimed at investigating mechanisms of salt tolerance and ionic relations of chickpea (Cicer arietinum L.) cultivars with different nitrogen (N) sources; Two resistant genotypes, ILC-205 and ILC-1919, were subjected to four levels of salinity (0.5, 3.0, 6.0, and 9.0 dS m(-1)). Nitrogen sources consisted of inoculation with two resistant Rhizobium strains, CP-29 and CP-32, mineral N additions, and no N application. Data was collected on root and shoot contents of sodium (Na+) chlorine, (Cl-,) and potassium (K+), and shoot to root Na+ ratio, as well as shoot K+ to Na+ ratio. Salinity affected shoot Na+ and Cl- contents, but nodulating plants had higher shoot Na+ contents than plants supplied with mineral N. Shoot to root Na+ ratios were lower in the mineral N treatment than in nodulating treatments at 3.0 dS m(-1), indicating that root compartmentalization and shoot exclusion were only possible at low salinities. Potassium levels of nodulating plant shoots were lower than those of nonnodulating plants only at low salinities. N-source significantly affected shoot K+/Na+ ratio, with nodulating plants having lower ratios than non-nodulating plants, indicating that rhizobial infection or nodule formation may lead to salt entry curtailing the selective ability of chickpea roots.
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