Plant and Soil

, Volume 103, Issue 2, pp 245–250 | Cite as

The response of two rice cultivars to external Na/Ca ratio

  • C. M. Grieve
  • H. Fujiyama
Article
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Revised:

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.

Key words

calcium deficiency Oryza sativa salinity sodium: calcium ratio 
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Copyright information

© Martinus Nijhoff Publishers 1987

Authors and Affiliations

  • C. M. Grieve
    • 1
  • H. Fujiyama
    • 2
  1. 1.U.S. Salinity Laboratory, Agricultural Research ServiceU.S. Department of Agriculture RiversideUSA
  2. 2.Faculty of AgricultureTottori UniversityTottoriJapan

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