This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Stumpf, D. K. Articles by Burris, R. H. Search for Related Content PubMed PubMed Citation Articles by Stumpf, D. K. Articles by Burris, R. H. Agricola Articles by Stumpf, D. K. Articles by Burris, R. H.

Articles

Organic Acid Contents of Soybean: Age and Source of Nitrogen ¹

Department of Biochemistry, College of Agricultural and Life Sciences, University of Wisconsin-Madison, Madison, Wisconsin 53706

The organic acid content of soybean (Glycine max v. Hodgson) root, stem, and leaf tissue was followed for 33 days after germination. Malonate was the predominant acid in leaf and root tissue, whereas fumarate was predominant in the stem. The malonate concentrations of the stem and root showed similar variations with time, but the leaf response was quite different. In nodules from 33-day-old plants, malonate was the predominant acid. Malonate levels in root and nodule tissue of 33-day-old plants were depressed in response to the addition of either nitrate or ammonia. Nodule tissue had a higher malonate concentration on nitrate nitrogen than it did on ammonium nitrogen, whereas root tissue had the higher malonate concentration on ammonium nitrogen. Analysis of organic acid concentrations of roots as a function of age and distance from the root tip in young soybean seedlings revealed a zone consistently high in malate. The malonate level in the entire root rose dramatically in tissue of age 96 to 120 hours.

This article has been cited by other articles:

				B. L. Fatland, B. J. Nikolau, and E. S. Wurtele Reverse Genetic Characterization of Cytosolic Acetyl-CoA Generation by ATP-Citrate Lyase in Arabidopsis PLANT CELL, January 1, 2005; 17(1): 182 - 203. [Abstract] [Full Text] [PDF]

				B. L. Fatland, J. Ke, M. D. Anderson, W. I. Mentzen, L. W. Cui, C. C. Allred, J. L. Johnston, B. J. Nikolau, and E. S. Wurtele Molecular Characterization of a Heteromeric ATP-Citrate Lyase That Generates Cytosolic Acetyl-Coenzyme A in Arabidopsis Plant Physiology, October 1, 2002; 130(2): 740 - 756. [Abstract] [Full Text] [PDF]

				V. Gueguen, D. Macherel, M. Jaquinod, R. Douce, and J. Bourguignon Fatty Acid and Lipoic Acid Biosynthesis in Higher Plant Mitochondria J. Biol. Chem., February 18, 2000; 275(7): 5016 - 5025. [Abstract] [Full Text] [PDF]