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This article in CS

  1. Vol. 23 No. 2, p. 369-371
    Received: May 21, 1982

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Frequency of Pigment Glands and Capitate and Covering Trichomes in Nascent Leaves of selected Cottons1

  1. Charles T. Bryson,
  2. Jack C. McCarty Jr.,
  3. Johnie N. Jenkins and
  4. W. L. Parrott2



Twenty-nine cotton strains, Gossypium hirsutura L., were evaluated to assess potential physical and chemical barriers confronting Heliothis ovipnsltion and feeding in relationship to the frequency of pigment glands and covering and capitate trichomes on the laminae of nascent terminal leaves. Significant differences were found among strains for each of the structures, with a two-fold difference in the number of pigment glands among glanded strains, a two-fold difference in capitate trlchomes, and a range of 0 to >1500 covering trichomes per cm2. Frequencies of covering trlchomes between adaxial and abaxial surfaces were significantly different among strains. The frequencies of glands and of the two types of trlchomes seemed to be independent of each other. Of the structures studied, only the density of glands had any influence on Heliothis larval growth. The number of pigment glands per cm2 of leaf tissue was negatively correlated with larval weight after five days of feeding.

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