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Plant and Soil

, Volume 105, Issue 2, pp 283–286 | Cite as

Photosynthesis of salt-stressed maize as influenced by Ca∶Na ratios in the nutrient solution

  • Z. Plaut
  • C. M. Grieve
Short Communications

Abstract

The CO2 fixation rate of salt-stressed maize leaves was influenced by the Ca∶Na ratio in the solution cultures. At an osmotic potential of −0.4 MPa in the root media, both the photosynthetic rate and the water-use efficiency declined as substrate Ca increased. Blade-Ca concentration also increased, while blade-Na and-Mg decreased. Apparently photosynthetic activity was inhibited in part by internal Mg deficiency rather than by Na toxicity or by Na-induced Ca deficiency. Reduction of the Ca∶Mg ratio in the culture stimulated the CO2 fixation rate.

Key words

maize photosynthesis salinity water use efficiency Zea mays L. Ca Na Mg 

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Copyright information

© Martinus Nijhoff Publishers 1988

Authors and Affiliations

  • Z. Plaut
    • 1
  • C. M. Grieve
    • 1
  1. 1.USDA, ARS, U.S. Salinity LaboratoryRiversideUSA

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