Graduate Thesis Or Dissertation
 

Studies on the metabolism on n-propyl N, N-di-n-propyl thiolcarbamate in legumes

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  • The absorption, translocation and metabolism of a new herbicide, n-propyl-C¹⁴ N, N-di-n-propyl-thiolcarbamate (PDPC), were studied in both peanut and soybean plants. These studies were carried out on plants of different ages and treated at two rates of application. The residue content of the plants was also determined from germination to maturity. Radioautograms demonstrated a general distribution of radio-activity throughout the plant although the above ground portions contained a somewhat higher content. Increasing the rate of application resulted in a greater uptake of PDPC but this was not proportional. The uptake increased somewhat faster than the rate of application. The residue content of both soybean and peanut seedlings was extremely low at harvest. The maximum concentration, which was reached two to three weeks after treatment, was quickly reduced. At the end of the 26 week growing period all the plant parts had negligible residue levels. Gas chromatography was used to establish the validity of the residue determining procedures. Experiments carried out on the effect of PDPC on germinating seedlings and its subsequent breakdown demonstrated the inhibitory effect of this compound on its own metabolism. Seedlings allowed to imbibe PDPC demonstrated a reduced abillty to break it into ethanol soluble components. The abillty to convert the herbicide into respiratory carbon dioxide was also reduced as was the incorporatlon into cellular tissue, The absorption of PDPC, however, was not affected. Age appears to affect the ability to break down PDPC. Germinating seeds were inhibited in their metabolism of the herbicide to a much larger extent than seedlings which were allowed to germinate in water before being treated. This applied not only to the breakdown of PDPC into metabolites but also the metabolism of the ethanol soluble intermediates, The seedlings germinated in the presence of PDPC, however, rapidly recover and within eight to ten days inhibition is small. Generally it may be stated that while uptake and translocatlon of n-propyl-C¹⁴ N,N-di-n-propylthiolcarbamate are not materially affected by PDPC at the concentrations studied, there is a inhibition to the metabolism of this compound when applied as a pre-emergence herbicide. The seedlings rapidly recover and the residue content at harvest is low.
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