Transport of Radioactivity in Relation to Bracts in the Cotton Plant

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Abstract
[14C]sucrose was applied to the leaf subtending 14-d-old boll (cotton fruit) with and without bracts, and to bracts alone in var. Suvin (Gossypium barbadense L.). The removal of bracts substantially enhanced the transport of radioactivity from the leaf to the carpels and seed cotton. When bracts alone were treated, still larger quantities of radioactivity were incorporated in the carpels and seed cotton. The bracts appeared to nourish the developing boll through their own photosynthate and regulate the transport of assimilate from the leaf.