HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Wolf, D. C. Articles by Martin, J. P. Search for Related Content PubMed Articles by Wolf, D. C. Articles by Martin, J. P. Agricola Articles by Wolf, D. C. Articles by Martin, J. P.

Decomposition of Fungal Mycelia and Humic-type Polymers Containing Carbon^-14 from Ring and Side-chain Labeled 2,4-D and Chlorpropham¹

ABSTRACT

Hendersonula toruloidea and Stachybotrys atra were grown on a liquid peptone-dextrose medium containing 10 ppm ring- or side-chain 2-¹⁴C labeled 2,4-D (2,4-dichlorophenoxyacetic acid), or chlorpropham (isopropyl m-chlorocarbanilate). Approximately 12% of the activity from ring-¹⁴C 2,4-D was present in the humic polymers produced by the fungi, and 4 to 16% was recovered in the mycelia. The mycelia of both fungi contained approximately 35% of the activity from either ring- or 2-¹⁴C chlorpropham and the humic polymers from 3 to 24% of the added activity. The decomposition percentages of the ¹⁴C portions of H. toruloidea and S. atra from ring-¹⁴C 2,4-D were 15 and 35% and 13 and 35%, respectively, for the mycelia and humic polymers. The label from 2-¹⁴C 2,4-D was released as ¹⁴CO₂ at rates greater than twice that for the ring-¹⁴C 2,4-D. Similarly, the carbon from ring-¹⁴C chlorpropham associated with H. toruloidea and S. atra mycelia and humic polymers was more resistant to decomposition than that from 2-14C chlorpropham. The results indicate that 2,4-D and chlorpropham or more probably their partial degradation products may be incorporated into microbial cells or products, some of which are relatively resistant to microbial degradation.

¹ Contribution from the Department of Soil Science & Agricultural Engineering, University of California, Riverside, CA 92502. Part of the work reported here is from the Ph.D. dissertation submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree.

² Assistant Professor of Soil Science, Dep. of Agronomy, Univ. of Maryland, and Professor of Soil Science, Dep. of Soil Science & Agricultural Engineering, Univ. of California, Riverside, respectively.

Received for publication February 4, 1976. Accepted for publication May 26, 1976.