Differential Absorption, Translocation and Metabolism of Metribuzin [4‐amino‐6‐tert‐butyl‐3‐(methylthio)‐as‐triazine‐5(4H)one] by Soybean Cultivars

Abstract

Soybean {Glycine max (L.) Merr.) cultivars have been reported to range in tolerance to injury by 4-amino-6-tert-butyl-3-(methylthio)-a5-triazine-5(4H)one (metribuzin), from tolerant (e.g. 'Bragg') to susceptible (e.g. 'Coker 102' and 'Semmes'). 'Bragg', 'Coker 102', and 'Semmes' soybeans were grown in sand subirrigated with nutrient solution containing labelled (^^Ccarbonyl metribuzin) and nonlabelled metribuzin to determine cultivar variability in absorption, translocation, and metabolism of metribuzin. Plants were periodically harvested, autoradiographed, and radioactivity in tissue extracts quantified. Data indicated that all 3 cultivars readily absorbed and translocated metribuzin. However, 'Bragg' tissues accumulated greater quantities of metribuzin metabolites than the other two cultivars. The major ^*C-containing metabolite in 'Semmes' and 'Coker' roots and stems was 6-tert-butyl-a^-triazine-3-5-(2H,4H)-dione, whereas the major ^*C-metabolite isolated from 'Bragg' roots and stems was a glucose conjugate. Results indicated that differentialintraspecific responses to metribuzin may resuit from differential capacities for herbicide detoxification by conjugation.

Response of Eight Peanut (Arachis hypogaea L.) Cultivars to the Herbicide AC 263,222

“…dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one] (4,14). Sweet corn, Zea mays L., cultivars have exhibited differential response to chloroacetamide and thiocarbamate herbicides (1).…”

Differential Tolerance of Two Barley Cultivars to Metribuzin

“…For personal use only. Smith and Wilkinson (1974) and Stephanson et al (1976) (five-leaf) in the early morning under conditions of bright sunlight, low RH, warm air temperatures, drier soil moisture levels and lower rares of the herbicide (0.14-0.21 kg/ha).…”

Absorption and Metabolism of Metribuzin in Barnyard Grass and American Nightshade

“…The extraction procedure was similar to the one used by Smith and Wilkinson (1974 (Table l). However, Fedtke (1972) showed that 0.3-1.0 ppm metribuzin increased the total dry matter production of potatoes because it lowered the daytime respiration rate.…”

“…The absorption and metabolism of C1a-metribuzin l4-arnino-6-terr-butyl- Smith and Wilkinson (1974) and for tomatoes by Stephenson et al (1976). Hargroder and Rogers (1974) peated using a second set of plants.…”