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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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