Crop Science Journal of Natural Resources and Life Sciences Education
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Published in Crop Sci 24:743-745 (1984)
© 1984 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Asay, K. H.
Right arrow Articles by Hansen, W. T.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Asay, K. H.
Right arrow Articles by Hansen, W. T., II
Agricola
Right arrow Articles by Asay, K. H.
Right arrow Articles by Hansen, W. T.

Prospects for Genetic Improvement in the Quackgrass x Bluebunch Wheatgrass Hybrid1

K. H. Asay and W. T. Hansen, II2

A promising F7 breeding population has been derived from the quackgrass [Elytrigia repens (L.) Nevski] x bluebunch wheatgrass [Pseudoroegneria spicata (Pursh) Löve] hybrid after 20 years of selection. Field studies were conducted to determine the potential of making additional genetic advances in subsequent generations. Significant differences were found among 172 hybrid clonal lines and their open pollinated progenies for seed and forage yield and extent of rhizome development. Broad-sense heritabilities were 94, 40, and 87% for seed and forage yield and rhizome development, respectively. Phenotypicorrelations (r, 170 df) among parental and progeny means were 0.30 for seed yield and ranged from 0.38 to 0.50 for rhizome development. Positive responses to selection pressure to alter the degree of rhizome development in the hybrid population add credence to the relatively high heritability estimates obtained. True-breeding caespitose or rhizomatous strains have been developed after two cycles of selection. A hybridization program to broaden the genetic base of the breeding population has been initiated.

Key Words: Interspecific hybridization • Heritability • Genetic variation • Seed yield • Forage yield • Rhizome development • Elytrigia repens (L.) Nevski • Pseudoroegneria spicata (Pursh) Löve • RS-1, RS-2

1 Contribution from the USDA-ARS in cooperation with the Utah Agric. Exp. Stn., Logan, UT, Journal Paper no. 2917.

2 Research geneticist and support scientist, USDA-ARS, Crops Res. Lab., Utah State Univ., UMC 63, Logan, UT 84322.

Received for publication December 27, 1983.




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
The SCI Journals Agronomy Journal Vadose Zone Journal
Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1984 by the Crop Science Society of America.