Abstract
Stomatal index was investigated as a potential morphological characteristic which may be useful in selecting for improved gas exchange or water relations in smooth bromegrass. The lower stomatal frequency per unit leaf area in the normal 8X plants than in 4X and 6X plants was due to the larger epidermal cell size. Epidermal cell size was the main factor determining stomatal frequency. A highly significant correlation (r = 0.96) was obtained between stomatal and epidermal cell frequency. Stomatal index on the adaxial leaf surface was about 15%, regardless of ploidy levels.
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