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Published in Crop Sci 17:91-93 (1977)
© 1977 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Stomatal Diffusion Resistance in Three Ploidy Levels of Smooth Bromegrass1

H. Z. Lea, G. M. Dunn and D. W. Koch2

Diurnal variations in stomatal resistance and the relationship of stomatal resistance to stomatal characters were investigated in tetraploid (4x), hexaploid (6x), and normal octoploid (8x) strains of Bromns inermis Leyss. Stomatal resistance of ‘Blair’ (8.6 sec/cm) was significantly higher than for the other six octoploid cultivars (5.8 to 6.5). The range of mean stomatal resistance between 0900 and 1600 hours (Eastern Standard Time) was approximately 4.0 to 9.0 sec/cm for 8x. Within a cultivar the diurnal pattern of stomatal resistance varied, dependent on the day of measurement; however, stomata of 4x and 6x plants consistently closed earlier in the evening than did 8x plants. Octoploid plants had the lowest mean stomatal resistance (5.1 sec/em), 6x intermediate (6.9), and 4x the highest (8.6), based on measurements between 0700 and 1930 hours for four measurement dates in June 1974.

A highly significant negative correlation (r = –0.58) was obtained between stomatal resistance, measured with a diffusion porometer, and total stomatal aperture estimated as the product of stomatal width x length x frequency. Stomatal width was the most important single factor in estimating total stomatal aperture (r = –0.92) and stomatal resistance (r = –0.54). Stomatal resistance was not affected significantly by leaf position on the culm.

Key Words: Stomatal aperture • Bromus inermis Leyss

1 Published with the approval of the Director of the New Hampshire Agric. Exp. Stn. as Scientific Contribution No. 800. Submitted by the senior author as partial fulfillment for the M.S. degree.

2 Graduate research assistant, professor, and assistant professor, respectively, Dep. of Plant Sci., Univ. of New Hampshire, Durham, NH 03824.

Received for publication December 22, 1975.




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