HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Ciha, A. J. Articles by Brun, W. A. Search for Related Content PubMed Articles by Ciha, A. J. Articles by Brun, W. A. Agricola Articles by Ciha, A. J. Articles by Brun, W. A.

Stomatal Size and Frequency in Soybeans¹

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.

Key Words: Stomatal mother cells • Light effects • Temperature effects • Water stress

² Research assistant and associate professor, Dep. of Agron. and Plant Genet., U. of Minn., St. Paul, MN 55101.

Received for publication October 30, 1974.