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Soil Science Society of America Journal Abstract -

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


This article in SSSAJ

  1. Vol. 40 No. 5, p. 700-704
    Received: Feb 4, 1976
    Accepted: May 26, 1976

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  1. D. C. Wolf and
  2. 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.

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