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Published in Crop Sci 15:11-15 (1975)
© 1975 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Solute Loss from Deteriorated Cottonseed: Relationship Between Deterioration, Seed Moisture, and Solute Loss1

John M. Halloin2,3,

Loss of electrolytes from cottonseed (Gossypium hirsutum L.) soaked in water was influenced by factors in the processing history of the seeds, such as delinting procedure and post-delinting washing. Measurements of electrolyte loss were most reproducible if they determined a change during an interval (15 to 45 min) not inclusive of zero time. Cottonseed (G. hirsutum ‘Deltapine 16’) that deteriorated under controlled conditions of 100% relative humidity and 35 to 50 C was reduced in viability and exhibited increased rates of solute leakage and moisture contents. Seeds that deteriorated under conditions in which their moisture contents were held at 20% showed a slight increase in solute loss upon deterioration, but the rates of solute loss were not significantly correlated with viability losses. Experiments with both viable and heat-killed seeds revealed that the increases in solute loss were proportional to degrees of seed hydration. Solute loss from heat-killed seeds was greater than that from viable seeds at equivalent moisture contents, indicating that embryo tissue viability influenced solute leakage. However, increased solute losses due to differences in seed moisture were of greater magnitude than those due to changes in seed viability. Rate of electrolyte loss is therefore not a valid measure of cottonseed deterioration.

Key Words: Gossypium hirsutum L. • Permeability • Electrolyte loss • Accelerated aging

1 Contribution from ARS-USDA, Southern Region, Oklahoma-Texas Area, National Cotton Pathology Research Laboratory, P.O. Drawer JF, College Station, TX 77840. In cooperation with the Plant Science Department, Texas Agricultural Experiment Station, Texas A&M University.

2 Research Plant Physiologist, ARS-USDA, National Cotton Pathology Research Laboratory, P.O. Drawer JF, College Station, TX 7784O.

3 Mention of specific equipment or commercial varieties does not constitute endorsement by the USDA over similar equipment or other varieties not mentioned.

Received for publication June 24, 1974.




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