HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Warnes, D. D. Articles by Johnson, V. A. Search for Related Content PubMed Articles by Warnes, D. D. Articles by Johnson, V. A. Agricola Articles by Warnes, D. D. Articles by Johnson, V. A.

Crown-Freezing and Natural Survival Comparisons of F₂–F₄ Bulk Populations from 25 Winter Barley Crosses¹

Crown-freezing survival and natural survival were used to compare the relative winterhardiness levels of bulk progenies of F₂ to F₄ 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.

Key Words: Winterhardiness • Hardy parent • Artificial selection • Natural selection

² Agronomist, West Central Experitnent Station, Morris, Minn. 56267, (formerly Supervisor of Agronomy Field Operations, University of Nebraska, Lincoln), and Research Agronomist, Plant Science Research Division, Agricultural Research Service, U. S. Dept. of Agriculture, Lincoln, Nebr.

Received for publication October 31, 1970.