Effect of Seed Source and Seedling Age on the Freezing Resistance of Winter Oats1
- H. G. Marshall2
Controlled freezing experiments were used to study the effect of the location where seed is produced on the freezing resistance of young winter oat plants (Avena byzantina K. Koch and A. saliva L.). Plants grown from Pennsylvania seed were significantly more resistant to freezing at early ages than those grown from Virginia seed, but seed source was not always important. Differences associated with location where the seed was grown disappeared as the plants aged, and the duration of the effect varied with the variety. The effect persisted as long as 26 days for the variety 'Ballard.' Seedling plants of the variety 'Wintok' had a moderate freezing resistance at 12 days of age, but this decreased to a first minimum at 19 days of age. The freezing resistance then rapidly rose to a maximum at 33 days of age, but a second decrease occurred after 33 days.
Limited data on chemical composition of the seed supported the hypothesis that the source effect was caused by differences in the nutrient reserves developed in the endosperm at different geographic locations. Freezing resistance was lowest when the N level in the seed was high, and highest when the P and K were high and the N level low.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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