The response of two rice cultivars to external Na/Ca ratio |
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Authors: | C M Grieve H Fujiyama |
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Institution: | (1) U.S. Salinity Laboratory, Agricultural Research Service, U.S. Department of Agriculture Riverside, 92501, CA, USA;(2) Faculty of Agriculture, Tottori University, Koyama, 680 Tottori, Japan |
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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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Keywords: | calcium deficiency Oryza sativa salinity sodium: calcium ratio |
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