Photosynthesis of salt-stressed maize as influenced by Ca∶Na ratios in the nutrient solution
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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 wordsmaize photosynthesis salinity water use efficiency Zea mays L. Ca Na Mg
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