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Calcium regulates K+/Na+ homeostasis in rice (Oryza sativa L.) under saline conditions

Author

Listed:
  • G.Q. Wu

    (State Key Laboratory of Grassland Agroecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, P.R. China)

  • S.M. Wang

    (State Key Laboratory of Grassland Agroecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, P.R. China)

Abstract

To investigate the effects of Ca2+ on cation accumulation and K+/Na+ selectivity, in this study, two-week-old rice (Oryza sativa L.) plants were exposed to 25 or 125 mmol/L NaCl with or without 10 mmol/L CaCl2. At low salinity (25 mmol/L NaCl), Ca2+ significantly decreased Na+ accumulation in roots, increased K+ accumulation in shoots, and maintained higher K+/Na+ ratios in both roots and shoots of rice plants. At high salinity (125 mmol/L NaCl), however, Ca2+ did not have any effects on Na+, K+ accumulation and K+/Na+ ratios in plants. Further analysis showed that, at low salinity, the addition of Ca2+ significantly enhanced the selective absorption and transport capacity for K+ over Na+ in rice. Although Na+ efflux and Na+ influx were remarkably reduced by Ca2+ under both low and high salt stresses, their ratio was lowered only under low salt stress. In summary, these results suggest that Ca2+ could regulate K+/Na+ homeostasis in rice at low salinity by enhancing the selectivity for K+ over Na+, reducing the Na+ influx and efflux, and lowering the futile cycling of Na+.

Suggested Citation

  • G.Q. Wu & S.M. Wang, 2012. "Calcium regulates K+/Na+ homeostasis in rice (Oryza sativa L.) under saline conditions," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 58(3), pages 121-127.
    • Handle: RePEc:caa:jnlpse:v:58:y:2012:i:3:id:374-2011-pse
    DOI: 10.17221/374/2011-PSE
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    Cited by:

    1. M. Shaaban & M. Abid & R.A.I. Abou-Shanab, 2013. "Amelioration of salt affected soils in rice paddy system by application of organic and inorganic amendments," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 59(5), pages 227-233.

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