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Genotypic Differences in Tolerance of Ice Encasement, Low Temperature Flooding, and Freezing in Winter Wheat 1
Author(s) -
McKersie B. D.,
Hunt L. A.
Publication year - 1987
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1987.0011183x002700050004x
Subject(s) - icing , biology , flooding (psychology) , genotype , freezing tolerance , winter wheat , agronomy , horticulture , botany , genetics , meteorology , gene , psychology , physics , psychotherapist
A key to improved winter survival of cereals in eastern Canada and northeastern USA appears to be resistance to a combination of winter stresses. Three traits associated with winterhardiness in winter wheat ( Triticum aestivum L. emend Thell.) were measured on 34 genotypes in late fall and early spring in 2 successive yr, to determine whether the environmental controls of icing and flooding tolerances are more or less complex than those for freezing tolerance. Significant genotypic differences were observed for all three traits, and significant genotype ✕ environment (year and sampling) interactions were noted for icing and freezing tolerances. The environmental controls for the expression of icing and freezing tolerances thus appear relatively complex, whereas the control of low temperature flooding tolerances appears somewhat simpler. Genotypes with high freezing tolerances tended to exhibit high tolerance of both ice encasement and low temperature flooding, but there were some exceptions. ‘Norstar’ and ‘Roughrider’, which exhibit good winterhardiness in western North America, did not express the same relative stress tolerance in this study.