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Traditional Combining‐Ability and Gardner‐Eberhart Analyses of a Diallel for Cold Resistance in Winter Wheat 1
Author(s) -
Parodi P. C.,
Nyquist W. E.,
Patterson F. L.,
Hodges H. F.
Publication year - 1983
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/cropsci1983.0011183x002300020032x
Subject(s) - diallel cross , biology , heterosis , additive genetic effects , hybrid , winter wheat , cold hardening , epistasis , seedling , horticulture , genetics , agronomy , genotype , gene , botany , heritability
Six soft red winter wheat ( Triticum aestivum L. era. Thell.) genotypes were crossed in a diallel system to estimate gene action and heterosis as expressed for cold resistance. Following cold hardening in the seedling stage, parental and F 1 genotypes were exposed to 2, −7, and −10 C for 4 hours and allowed to recover for 10 days. Both the traditional partitioning of genotypes and that by Gardner and Eberhart were performed. The F 1 hybrids exceeded the better parents by 26% for regrowth tissue weight and by 30% for crown weight after freezing, averaged over all temperatures. These two characters were significantly correlated. The major portion of the genetic variability was associated with specific combining ability or specific heterosis effects due to dominance or addltive‐by‐additive gene action.