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


     

Published in Crop Sci 8:683-686 (1968)
© 1968 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 Roos, E. E.
Right arrow Articles by Sarkissian, I. V.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Roos, E. E.
Right arrow Articles by Sarkissian, I. V.
Agricola
Right arrow Articles by Roos, E. E.
Right arrow Articles by Sarkissian, I. V.

Osocitric Dehydrogenase and Isocitric Lyase in Heterotic and Nonheterotic Maize (Zea mays L.)1

Eric E. Roos and Igor V. Sarkissian2

Heterotic and nonheterotic maize (Zea Mays L.) hybrids and their inbred parents were studied during eariy postgermination to learn a physiological aspect of the phenomenon of heterosis. The enzymes isocltric dehydrogenase (Ls-isocitrate:NADP oxidoreductase ldecarboxylating] EC 1.1.1.42) and isocitric lyase (Ls-isocitrate glyoxylate-lyase EC 4.1.3.1.) from scutellar tissue were assayed spectrophotometrically. When each hybrid was compared with its parents, none showed superior isocitric dehydrogenase activity during the period 2 to 6days following water imbibition. With respect to isocitric lyase activity, a definite heterotic response was observed in those hybrids classified as heterofic; nonheterotic hybrids failed to show heterosis for this enzyme. Lyase activity, first detectable 24 to 48 hours after imbibition, increased rapidly until day 5 and then declined. Differences in lyase activity appeared to be quantitative.

Key Words: heterosis • maize • isocitric • dehydrogenase • isocitric lyase • germination • scutellum

1 Contribution from the Department of Agronomy and Genetics, West Virginia University, Morgantown, W. Va. Part of dissertation submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree. Published with the approval of the Director of the West Virginia Agricultural Experiment Station as Scientific Paper No. 995.

2 NDEA pre-doctoral fellow in Genetics (now Plant Physiologist, Crops Research Division, ARS, USDA, National Seed Storage Laboratory, Fort Collins, Colo. 80521) and Associate Professor of Genetics (now Professor of Biology, Institute of Life Science, Texas A & M University, College Station, Texas).

Received for publication March 19, 1968.




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
The SCI Journals Agronomy Journal Vadose Zone Journal
Journal of Plant Registrations Soil Science Society of America Journal
Journal of Natural Resources
and Life Sciences Education		 Journal of
Environmental Quality
Copyright © 1968 by the Crop Science Society of America.