Abstract
The response of the rice cultivars ‘M9’ and ‘M-201’ to nutrient cultures salinated at −0.4 MPa with varying ratios of Na and Ca was studied. Although the dry matter production of both cultivars was sensitive to the Na/Ca ratio, this correlation was significant only for M-201. Calcium nutrition was severely affected by the composition of the external solution, and the laminae exhibited Ca-deficiency symptoms at Na/Ca molar ratios of 78 and 198. Sodium concentration in the shoot decreased as the Na/Ca ratio in the external solution decreased. Patterns of Na and Cl distribution in the shoot tissues were similar; both ions were accumulated preferentially in the tillers and older leaves. The Na-induced inhibition of Ca uptake and transport appears to be more limiting to shoot growth of M9 and M-201 than Na toxicity per se.
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Grieve, C.M., Fujiyama, H. The response of two rice cultivars to external Na/Ca ratio. Plant Soil 103, 245–250 (1987). https://doi.org/10.1007/BF02370396
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DOI: https://doi.org/10.1007/BF02370396