Tolerance in rice (Oryza sativa (L.) in relation to salt uptake and yield*

The nature of salt tolerance in rice was studied in solution culture with known tolerant and susceptible varieties. Greater amounts of K+ and Ca²⁺ and lesser amounts of C1-accumulated in the leaves of the tolerant varieties. Au land Annapoorna. The tolerance was presumed to be due to avoidence of Na⁺ and the ability to selectively accumulate K+ in the roots of relatively tolerante rice varieties. With the increase in salinity, Na+ as well as K+ concentration in the leaf increased with decrease in K/Na and K/Cl ratio. However, the relative decrease in the ratio was of lower order in the salt tolerant types, A μ 1 and Annapoorna.