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Published in Crop Sci 9:202-205 (1969)
© 1969 Crop Science Society of America
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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.

Key Words: Winter hardiness • Seed composition • Freezing experiments

1 Joint contribution from the Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, and the Department of Agronomy, The Pennsylvania Agricultural Experiment Station, University Park. Approved July 2, 1968, as paper no. 3438, Journal Series, The Pennsylvania Agr. Exp. Sta. This study was part of Northeast Regional Project NE-23 Rev., "Developing Improved Oat Varieties for the Northeastern Region," a cooperative study involving Agricultural Experiment Stations in the Northeast Region and the Cereal Crops Research Branch, Crops Research Division, ARS, USDA, and supported in part by regional funds.

2 Research Agronomist, Crops Research Division, ARS, USDA, The Pennsylvania State University, University Park, 16802, and Associate Professor of Agronomy.

Received for publication August 16, 1968.


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D. B. Fowler
Cold Acclimation Threshold Induction Temperatures in Cereals
Crop Sci., May 1, 2008; 48(3): 1147 - 1154.
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