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Pollination by Honey Bees of Male-sterile Cotton in Cages¹

In 1969 and 1970, honey bees (Apis mellifera L.) successfully pollinated the caged A-line flowers of a three-species cross between Gossypium arboreum L., G. thurberi Todaro, and G. hirsutum L., which exhibits cytoplasmic male sterility at lnoderately high temperatures. The pollen source was an isogenic B-line. The supply of seeds was increased from a few to more than 80 kg. The A-line plants produced 84% as much seed cotton as the B-line plants. Some 2% of the seeds produced on A-line plants were from self-fertile flowers; 98% were the result of crossing. A reduction in sunlight of 47% lowered yields of seed cotton 50%, compared with plants subjected to a 27% reduction.

Key Words: Apis mellifera L. • Gossypium arboreum L. • G. thurberi Todaro • G. hirsutum L. • Shading

² Entomology Research Division, ARS, USDA, Tucson, Ariz. 85719 and Professor of Plant Breeding, University of Arizona, Tucson 85721, respectively.

Received for publication January 5, 1972.