Crop Science Grow Your Career with CSSA
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Published in Crop Sci 7:216-219 (1967)
© 1967 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 ElRouby, M. M.
Right arrow Articles by Penny, L. H.
Right arrow Search for Related Content
PubMed
Right arrow Articles by ElRouby, M. M.
Right arrow Articles by Penny, L. H.
Agricola
Right arrow Articles by ElRouby, M. M.
Right arrow Articles by Penny, L. H.

Variation and Covariation in a High Oil Population of Corn (Zea mays L.) and Their Implications in Selection1

Mohamed M. ElRouby and L. H. Penny2

Sixty-four half-sib families, each containing four full-sib families, were grown in replicated trials in five environments. Data were collected for silking date, plant and ear heights, kernel size, lodging percentage, shelling percentage, oil percentage, yield of grain, and yield of oil. Estimates of additive and dominance variances were calculated for each trait, and these variance estimates were used to predict the genetic gain from different selection methods. Phenotypic and additive genetic correlations among traits were calculated.

All estimates of additive genetic variance were significantly greater than zero. None of the estimates of dominance variance was significant except for yield of grain in one environment. Mass selection appeared to be the most effective method of selection for higher oil percentage in this population, but recurrent selection for general combining ability would be the most effective method for yield of grain and yield of oil. The only traits significantly correlated with oil percentage were silking date and yield of oil. A selection index for improving yield of oil appeared to have little advantage over selection for yield of oil alone.

Key Words: genetic correlation • genetic gain • genetic variance • selection methods • selection index

1 Contribution from the Iowa Agricultural and Home Economics Experiment Station, Ames, Iowa, (Journal Paper No. J-5351, Project No. 1575), and the Crops Research Division, ARS, USDA, cooperating. Supported in part by funds granted by the Corn Industries Research Foundation to the Clinton Corn Processing Company, Clinton, Iowa, for analytical services to corn breeders for study of the oil content of corn. Part of a thesis submitted by the senior author in partial fulfillment of the requirements of the Ph.D. degree.

2 Formerly graduate student, Iowa State University, (now Assistant Professor, Plant Production Department, College of Agriculture, Alexandria University, Alexandria, U.A.R.) and Research Agronomist, U. S. Department of Agriculture, and Professor, Iowa State University.

Received for publication June 10, 1966.




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 © 1967 by the Crop Science Society of America.