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Published in Crop Sci 16:550-553 (1976)
© 1976 Crop Science Society of America
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Genetic Variation in Stomatal Length and Frequency and other Characteristics in Bromus inermis Leyss.1

Geok-Yong Tan and G. M. Dunn2

Genetic variation in stomatal length and frequency was investigated in 10 single crosses of a half-diallel cross involving five bromegrass (Bromus inermis Leyss.) genotypes.

The diallel analyses revealed much higher general combining ability (GCA) than specific combining ability (SCA) for all characters. The SCA was not significant for any character. Relatively high narrow-sense heritability estimates were obtained for stomatal length (0.69) and frequency (0.85) and for other leaf characters. General combining ability effects of the parental clones were also estimated for all characters. Negative genotypic correlations were obtained between stomatal length and stomatal frequency of the same leaf. The phenotypic and genotypic correlations obtained between stomatal characters and other traits showed that stomatal length was positively while stomatal frequency was negatively correlated with leaf length, width, area, and tiller dry weight. These data indicated that selection for larger and fewer stomata should tend to result in longer and wider leaves of larger areas and greater tiller dry weight. None of the characters under study was associated with the spaced plant yield.

Key Words: Bromegrass • Tiller dry weight • Plant dry weight • General combining ability • Specific combining ability • Genetic correlation • Phenotypic correlation • Heritability

1 Published with the approval of the Director of N. H. Agric. Exp. Stn. as Scientific Contribution No. 795 and as a contribution from the NE-74 Regional Forage Technical Committee. Submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree.

2 Postdoctorate fellow, Dep. of Plant Science, Univ. of Alberta, Edmonton, Alberta, Canada, and professor of plant science and genetics, Univ. of New Hampshire, Durham, NH 03824, respectively.

Received for publication November 12, 1975.




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