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Incorporation of ¹⁴C-Photosynthate into Developing Cotton Bolls, Gossypium hirsutum L.¹

Incorporation of ¹⁴C-photosynthate into developing cotton (Gossypium hirsutum L.) bolls of several ages was studied in the cultivar ‘Paymaster III.’ Maximum incorporation of ¹⁴C-assimilate into developing boll walls and fiber occurred at 8 to 10 and 23 to 40 days after anthesis, respectively. ¹⁴C-photosynthate incorporation was rapidly increasing in the developing fibers prior to the completion of fiber elongation. For Paymaster III, ‘Acala SJ-1,’ and ‘Stoneville 213’ cultivars, the rate of increase of fiber dry weight was maximal prior to the completion of fiber elongation.

Key Words: ¹⁴C-photosynthate • Fiber elongation • Fiber dry weight increase • Cellulose

² Professor of Plant Physiology and Post-Doctoral Fellow, Department of Plant Sciences, Texas A&M University; and Research Geneticist, PSRD, ARS, USDA, College Station, Texas 77843.

Received for publication June 19, 1972.

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