ISSN:
1365-3180
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
The absorption and loss of four chloro-s-triazines was investigated in excised roots of four Setaria taxa. Different taxa absorbed the various triazines at different rates. In general, triazine absorption was greater at 2°C than at 22.5°C, and absorption rates were linear functions of external concentrations.Efflux studies showed marked differences in the rate of loss of 14C-atrazine, 14C-simazine, and 14C-propazine from root sections of robust white foxtail (Setaria viridis var. robustaalba Schreiber). The roots lost 14C-atrazine very quickly, and the loss was similar in either water or 12C-atrazine. Atrazine appears to be restricted to the apoplast of the root. 14C-atrazine was lost more rapidly than either 14C-simazine or 14C-propazine to water or to solutions containing the unlabelled herbicide. Efflux of 14C-simazine was greater than that of 14C-propazine to solutions of CaCl2. From the pattern of efflux, it was concluded that 14C-simazine and 14C-propazine accumulated in the root symplast. Furthermore, the decreases in chloro-s-triazine absorption in the presence of metabolic inhibitors (dinitrophenol, sodium arsenite) may suggest that 14C-simazine and 14C-propazine entered the symplast by an energy-dependent process.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-3180.1976.tb00392.x
Permalink
