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This article in CS

  1. Vol. 15 No. 3, p. 309-313
     
    Received: Oct 30, 1974


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doi:10.2135/cropsci1975.0011183X001500030008x

Stomatal Size and Frequency in Soybeans1

  1. A. J. Ciha and
  2. W. A. Brun2

Abstract

Abstract

The stomatal frequency of 43 soybean [Glycine max (L.) Merr. genotypes varied significantly. The mean frequency on the adaxial surface was 130 (range: 81 to 174); on the abaxial surface, it was 316 stomata/mm2 (range: 242 to 345). The mean guard cell lengths were 21.9 and 20.4 µ for the adaxial and abaxial surfaces, respectively.

Stomatal frequency and leaf area were measured on the terminal leaflet of the third trifoliolate of soybeans grown at 18, 24, and 30 C and at 19,300 and 32,300 lux. Stomatal frequency significantly decreased with temperature on the abaxial surface, but there was no effect on the adaxial surface. Stomatal frequency significantly increased with light intensity on both surfaces. Leaf area increased with temperature and decreased with light intensity. Stomatal number/leaflet did not vary significantly with light or temperature treatments.

Water-stressed, field-grown plants had significantly greater stomatal frequency and smaller leaf area than nonwater-stressed plants. Stomata/leaflet surface were significantly lower on water stressed plants than nonwater-stressed plants.

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