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Capitate Hairs on Cotton Leaves and Bracts¹

Significant differences in the capitate hair density of different cotton, Gossypium hirsutum L and G. arboreum L., stocks were revealed by quantitative analysis of scanning electron micrographs of leaf and involucral bract epidermal surface;. The density of capitate hairs on eight greenhouse-grown stocks ranged from 2.1 to 8.7 and from 4.7 to 31.6 per mm₂ on the adaxial and abaxial leaf surfaces, respectively. The capitate hair density on bracts of seven greenhouse-grown stocks ranged from 0.9 to 45 and from 3.4 to 8.6 per mm₂ on the adaxial and abaxial surfaces, respectively. There were significant differences among stocks in capitate hair density on both leaves and bracts. Capitate hairs were present on leaves of plants with the H₂, Sm₁^s1Sm₂, ne₁ne₂, or gl₂gl₃ mutant genes. There were no significant differences in capitate hair density on leaves of the same stock collected two years apart or on bracts collected from the same plant at anthesis or at 30 and 60 days postanthesis.

Key Words: Glandular hairs • Gossypium arboreum • G. hirsutum • Involucral bract • Trichomes

² Plant physiologist, Hellenic Cotton Board, Athens (404) Greece, and profs., Dep. of Biological Sciences, Texas Tech Univ., Lubbock, TX 79409.

Received for publication February 8, 1980.