Selectivity of ions absorption as mechanism of salt tolerance in rice (variety Shaheen Basmati)
2003
Hussain, N. (Soil Salinity Research Inst., Pindi Bhattian (Pakistan)) | Ali, A. | Khan, A.G. | Obaid-ur-Rehman | Tahir, M.
The water culture studies were conducted to investigate a physiological mechanism. Performance of this rice variety, ion concentration and uptake were studied under stress of three salinity levels (30, 60 and 90 mM1-1) created by NaCl. The results indicated that shoot dry matter was not affected significantly with all the three levels of salinity. However the root dry matter was affected appreciably by the levels of 60 and 90 mM NaCl. Sodium concentration and uptake was enhanced significantly by root and shoot with the first level of salinity (30 mM) but thereafter the differences were non-significant indicating the preferential absorption of this cation. The K concentration was decreased significantly in shoots with all the levels. The impact was less pronounced in roots as far as K absorption was concerned. There was no effect on Ca and Mg. The values of K: Na, Ca: Na and Ca + Mg: Na ratios in shoot and root were comparatively narrow under stress conditions which indicated that Shaheen Basmati variety used ion selectivity mechanism in showing its tolerance when grown in saline medium.
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