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Published in Crop Sci 15:410-412 (1975)
© 1975 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Chilling Duration on Germination of Cottonseed1

D. F. Cole and M. N. Christiansen2

Seed of genetic selection M-8 (Gossypiura hirsutum L.) and ‘Pima S-4’ (G. barbademe L.) were subjected to various levels of chilling (0, 1, 2, 4, 8, 16, and 32 days at 5 C in water) after the seed were preconditioned by inbibition for 6 hours at 30 C in water. Seed for evaluation of chilling injury were germinated over a temperature range of 15 to 30 C on a thermogradient plate and in rolled towels at 30 C. Percent emergence and stand survival were determined for both cultivars.

Higher percent germination over the same range of temperatures on the thermogradient plate was obtained with M-8 than with Pima S-4. Seed chilled for 16 and 32 days was very low in viability and germinated over a narrower range of temperatures than seed chilled for shorter periods. Preconditioning increased germination of both selections and improved emergence of M-8. Seed of Pima S.4 inbibed water at a faster rate than M-8. Selections differed in their responses to different durations of chilling.

Key Words: Thermogradient plate • Emergence • Seedling • Gossypium hlrsutum L. • G. barbadense

1 Contribution from the Agric. Marketing and Plant Physiol. Res. Inst., Northeastern Region, ARS, USDA, Beltsville, MD 20705.

2 Plant physiologist, ARS, USDA, N. Dak. State U., Fargo, ND 58102 (formerly research plant physiologist, seed quality lab., AMRI, ARS, USDA, Beltsville, MD 20705) and plant physiologist and leader, plant stress lab., PPHI, ARS, USDA, Beltsville, MD 20705

Received for publication September 25, 1974.




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