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Crop Science Abstract -

Genetic Variation in Stomatal Length and Frequency and other Characteristics in Bromus inermis Leyss.1


This article in CS

  1. Vol. 16 No. 4, p. 550-553
    Received: Nov 12, 1975

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  1. Geok-Yong Tan and
  2. 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.

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