Decomposition of Fungal Mycelia and Humic-type Polymers Containing Carbon-14 from Ring and Side-chain Labeled 2,4-D and Chlorpropham1
- D. C. Wolf and
- J. P. Martin2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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