Plant Physiol.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Plant Physiology 67:973-976 (1981)
© 1981 American Society of Plant Biologists

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 Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
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 HighWire
Right arrow Citing Articles via CrossRef
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Thomas, R. J.
Right arrow Articles by Schrader, L. E.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Thomas, R. J.
Right arrow Articles by Schrader, L. E.
Agricola
Right arrow Articles by Thomas, R. J.
Right arrow Articles by Schrader, L. E.
Articles

The Assimilation of Ureides in Shoot Tissues of Soybeans 1

1. CHANGES IN ALLANTOINASE ACTIVITY AND UREIDE CONTENTS OF LEAVES AND FRUITS

Richard J. Thomas and Larry E. Schrader

Department of Agronomy, University of Wisconsin-Madison, 1575 Linden Drive, Madison, Wisconsin 53706

The ureides, allantoin and allantoic acid, are major forms of N transported from nodules to shoots in soybeans (Merr.). Little is known about the occurrence, localization, or properties of the enzymes involved in the assimilation of ureides in shoot tissues. We have examined the capacity of the shoot tissues to assimilate allantoin via allantoinase (EC 3.5.2.5) during leaf and fruit development in nodulated soybeans. Specific activity of allantoinase in leaves peaked during pod formation and early seed filling. In developing fruits allantoinase activity in the seeds was 2 to 4 times that in the pods when expressed on a fresh weight or organ basis. In seeds, the embryos contained the highest specific allantoinase activity. Stems and petioles also had appreciable allantoinase activity. With development, peaks in the amounts of allantoic acid, but not allantoin, were measured in both leaves and fruits suggesting that the assimilation of allantoic acid may be a limiting factor in ureide assimilation. Highest amounts of ureides were measured in the pith and xylem of stem tissues and in developing pod walls.

1 Research supported by College of Agricultural and Life Sciences, University of Wisconsin, Madison, Wisconsin, United States Department of Agriculture-Cooperative Research Grant 616-15-72, and American Soybean Association Research Foundation Grant ASARF 80383. A preliminary report of this work has appeared (21).




This article has been cited by other articles:


Home page
 J Exp BotHome page
C. D. Todd and J. C. Polacco
Soybean cultivars 'Williams 82' and 'Maple Arrow' produce both urea and ammonia during ureide degradation
J. Exp. Bot., April 1, 2004; 55(398): 867 - 877.
[Abstract] [Full Text] [PDF]

Home page
 J. Bacteriol.Home page
S. B. Mulrooney and R. P. Hausinger
Metal Ion Dependence of Recombinant Escherichia coli Allantoinase
J. Bacteriol., January 1, 2003; 185(1): 126 - 134.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1981 by the American Society of Plant Biologists