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The absence of an effect of the sodium to calcium ratio on sodium chloride uptake by rice oryza sativa



The absence of an effect of the sodium to calcium ratio on sodium chloride uptake by rice oryza sativa



New Phytologist 99(1): 81-90



The effect of the Na/Ca ratio in the growth medium on the response of the salt-sensitive crop species O. sativa L. to NaCl salinity was investigated. No effects on growth or salt concentration in the shoot were found over a range of Na/Ca ratios (5-25) considered likely to be commonly encountered in saline situations in the field, and even at extreme Na/Ca ratios (100-500) there were only marginal increases in NaCl entry to the shoot. Increasing the Ca concentration in the growth medium over a wide range did not, therefore, ameliorate the effects of salinity on rice seedlings. Polyethylene glycol at low, osmotically negligible, concentrations reduced the movement of Cl to the shoot by 60-70% even in the presence of adequate (3.5 mol m-3) Ca. Membranes of rice roots respond weakly to Ca; they are capable of better permeability control than is evoked by Ca2+. The relevance of this to the salt sensitivity of rice is discussed.

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Accession: 006594439

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