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Crown‐Freezing and Natural Survival Comparisons of F 2 –F 4 Bulk Populations from 25 Winter Barley Crosses 1
Author(s) -
Warnes D. D.,
Johnson V. A.
Publication year - 1972
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/cropsci1972.0011183x001200040001x
Subject(s) - biology , hordeum vulgare , relative survival , crown (dentistry) , natural selection , winter wheat , horticulture , botany , poaceae , zoology , agronomy , population , demography , genetics , medicine , cancer registry , cancer , dentistry , sociology
Crown‐freezing survival and natural survival were used to compare the relative winterhardiness levels of bulk progenies of F 2 to F 4 generations of 25 winter barley ( Hordeum vulgare L.) crosses advanced under natural selection at Lincoln, Nebr. The winter of 1960–61 more effectively increased winterhardiness and coldhardiness of segregating populations than did the preceding or succeeding winters. None of the 25 crosses produced bulk generations with average natural survival that statistically exceeded the hardy parent. Crosses involving a wintertender parent and a hardy parent generally showed significant increases in survival with each succeeding generation. The crown‐freezing technique should be a valuable tool for the prediction of coldhardiness in winter barley and supplement winterhardiness data from natural field survival.