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Published in Crop Sci 12:752-754 (1972)
© 1972 Crop Science Society of America
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Accumulation of Simple Sugars in Developing Cotton Bolls as Influenced by Night Temperatures1

J.W. Conner, D.R. Krieg and J.R. Gipson2

Cotton plants (Gossypium hirsutum L. var. Dunn 56 C) growing in the field were subjected to four different night temperature regimes (10, 15, 20, and 25 C) during the boll development phase. Total and individual sugars were determined on developing bolls ranging in age from 0 to 45 days. Total soluble sugars were found to be directly associated with temperature, with the lowest concentration occurring in the 10-C treated bolls, and the highest concentration in the 25-C treated bolls for the first 15 days. After 15 days this relationship was reversed. Definite time-temperature relationships that were apparently associated with the cessation of fiber elongation and the initiation of secondary wall formation were noted. The principal sugars present were glucose, fructose, and sucrose. The concentration of each varied with boll age and temperature treatment.

Key Words: Glucose • Fructose • Sucrose

1 A joint contribution of Texas Tech University, College of Agricultural Sciences, and Texas Agricultural Experiment Station. This report represents part of a thesis submitted by the senior author in partial fulfillment of the requirements for the M.S. degree in Agronomy, Texas Tech University, and was supported in part by a grant from Cotton Incorporated.

2 Graduate Student and Research Technician, Texas Tech University and Texas A&M University; Assistant Professor, Department of Agronomy, Texas Tech University, Lubbock, Texas 79409; and Associate Professor, Texas A&M University Research and Extension Center, Lubbock, Texas 79401, respectively.

Received for publication March 11, 1972.




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