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Soil Science Society of America Journal Abstract -

Photosynthesis in K- and Mg-Deficient Maize (Zea mays L.) Leaves1


This article in SSSAJ

  1. Vol. 30 No. 2, p. 220-223
    Received: July 6, 1965
    Accepted: Oct 19, 1965

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  1. D. E. Peaslee and
  2. D. N. Moss2



Rates of photosynthesis in maize leaves were closely related to K or Mg concentrations in the leaf tissue. The critical concentrations were about 2 mg/g for K and 200 µg/g for Mg on a fresh weight basis. Normal-appearing leaves of K-stressed plants had sharply diminished photosynthesis rates, whereas Mg deficiency affected photosynthesis rates only after the appearance of chlorosis. Apparently Mg deficiency exerted an influence through chlorophyll deterioration while K deficiency decreased stomatal apertures. Application of the deficient nutrient caused marked recovery within 24 hours of K-deficient leaves but not of Mg-deficient leaves.

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