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Decomposition of Fungal Mycelia and Humic‐type Polymers Containing Carbon‐14 from Ring and Side‐chain Labeled 2,4‐D and Chlorpropham
Author(s) -
Wolf D. C.,
Martin J. P.
Publication year - 1976
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1976.03615995004000050028x
Subject(s) - mycelium , chemistry , decomposition , isopropyl , humic acid , ring (chemistry) , polymer , degradation (telecommunications) , organic chemistry , botany , biology , telecommunications , fertilizer , computer science
Hendersonula toruloidea and Stachybotrys atra were grown on a liquid peptone‐dextrose medium containing 10 ppm ring‐ or side‐chain 2‐ 14 C labeled 2,4‐D (2,4‐dichlorophenoxyacetic acid), or chlorpropham (isopropyl m ‐chlorocarbanilate). Approximately 12% of the activity from ring‐ 14 C 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‐ 14 C chlorpropham and the humic polymers from 3 to 24% of the added activity. The decomposition percentages of the 14 C portions of H. toruloidea and S. atra from ring‐ 14 C 2,4‐D were 15 and 35% and 13 and 35%, respectively, for the mycelia and humic polymers. The label from 2‐ 14 C 2,4‐D was released as 14 CO 2 at rates greater than twice that for the ring‐ 14 C 2,4‐D. Similarly, the carbon from ring‐ 14 C 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.