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- Title
Untersuchungen über Sonchus arvensis III. Metabolismus von MCPA.
- Authors
Fykse, Haldor
- Abstract
Roots of <em>Sonchus arvenis</em> L. were injected with 14C-MCPA at the time of planting of the root sections and when the plants had leaves 3 cm, 5-7 cm and 12-15 cm long. After extraction with 70% ethanol and separation by thin layer chromatography, three components, termed 1, 2 and 3, were detected by scanning. Component 2 gave a chromatograph identical to MCPA and was probably the non-metabolized residue of the injected material. Component 3 appeared faster than component 1 but, when heated with 1 N HCl or 1 N NaOH, both of them yielded component 2 (MCPA). In this latter reaction the conversion of component 3 was again the fastest. The older the plants the more rapid was the metabolism of MCPA, the highest metabolic rate occurring in the main roots. In secondary roots and leaves this process occurred more slowly. Dormant roots were capable of metabolizing MCPA quite as well as non-dormant roots. Raising the temperature from 7° to 23°C accelerated the metabolic process. The liberation of 14CO2 proceeded very slowly. During a period of 4 days only 1.3% of the total radio-activity was released as 14CO2. In biotests, with <em>Raphanus sativus</em> L. as test species, component 3 appeared to be as phytotoxic as component 2 (MCPA), whereas the more stable component 1 exhibited very low phytotoxicity.
- Subjects
MCPA (Herbicide); HERBICIDES; SOW thistles; PHYTOTOXICITY; CHROMATOGRAPHIC analysis
- Publication
Weed Research, 1976, Vol 16, Issue 5, p309
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1976.tb00419.x