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Interrelation in Common Winter Wheat of Cold Hardiness and Emergence in Dry Soils¹

Rapid emergence is important for wheat (Triticum aestivum L. em Thell.) establishment in semiarid winter wheat areas. Ability to germinate and emerge under low moisture stress may involve physiological processes in common with those of cold hardiness of young seedlings.

A germinated-seed technique was used to determine whether a relationship exists between cold hardiness of very young plants and emergence ability of winter wheat under moisture stress. Four parental cultivars and nine populations from crosses among them were used to evaluate these relationships. Cold hardiness measured by percent survival and emergencerate index had relatively high heritability values. Phenotypic and genotypic correlation coefficients between measures of cold hardiness and emergence ability suggest that these responses in winter wheat are controlled in small part by the same genetic system.

Key Words: Drought resistance • Germination • Winterhardiness • Triticum aestivum L. em Thell.

² Formerly graduate assistant Purdue University (now extension agronomist, Washington State University); Lynn distinguished professor; director North Central Dairy Forage Research Center, USDA-ARS, Madison, WI; and professor, respectively, Purdue University.

Received for publication February 17, 1981.