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Published in Crop Sci 10:362-365 (1970)
© 1970 Crop Science Society of America
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Relationship Between Crown Moisture Content and Killing Temperature for Three Wheat and Three Barley Cultivars1

E. L. Metcalf2, C. E. Cress2, C. R. Olein3 and E. H. Everson3

A quantitative investigation of the relationship between freeze-damaged plant crowns and the percent moisture of the crowns was conducted. ‘Wong,’ ‘Hudson,’ and ‘Dicktoo’ barleys (Hordeum vulgare L.) and ‘Genesee,’ ‘Illinois 59-884’ (CI 14023), and ‘Redcoat’ wheats (Triticum aestivum L.) were the cultivars studied. Artificial freezing tests, over a temperature range of —18 to —7 C and over a range of adjusted plant crown moisture percentages of 55 to 75%, were used. Crown damage was assessed as a root regrowth rating on an arbitrary scale of 0 to 9. Equations were obtained for each cultivar relating root regrowth to crown moisture and killing temperature. Predicted root regrowth was plotted against crown moisture and killing temperature as curves representing several levels of survival. The close relationship which exists between moisture content and freezing injury at specific temperatures was clearly demonstrated. Dicktoo barley and Illinois 59-884 wheat were the cultivars most resistant to freeze-damage. Macroscopic pictures of freeze-damaged plant crowns are included.

Key Words: Winterkill • Survival Curves

1 Cooperative investigations of the Crops Research Division, Agricultural Research Service. U. S. Department of Agriculture, and the Michigan Agricultural Experiment Station, East Lansing, Mich. 48823. Journal Paper No. 4919. Research supported in part by grant from Michigan Soft White Wheat Processors. Computations financed in part by Grant GB6646 of the National Science Foundation.

2 Research Associate, Statistician and Associate Professor, and Professor and Wheat Breeder, respectively, Department of Crop and Soil Sciences, Michigan State University, East Lansing, Mich.

3 Research Plant Physiologist, Crops Research Division, ARS, USDA, East Lansing, Mich.

Received for publication December 13, 1969.




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