TRANSLOCATION OF ¹⁴C‐ASSIMILATES AND 3‐AMINO‐1,2,4‐TRIAZOLE AND ITS METABOLITES IN AGROPYRON REPENS

Abstract

Summary. Translocation of 3‐amino‐1,2,4‐triazole‐5‐14C (14C‐aminotriazole) was compared to that of 14C‐assimilates in couch grass (Agropyron repens (L.) Beauv.) at three different growth stages. Assimilates of 14CO2 were translocated from the treated shoot to other shoots and rhizomes at the 2–3‐leaf and 3–4‐leaf stages of development. Much less labelled material was translocated into untreated shoots at the 5‐leaf stage. More 14C‐assimilates were translocated to the roots than to untreated shoots at all developmental stages. The translocation patterns of 14C‐aminotriazole and 14C‐assimilates were similar. Two metabolites, A and B, were formed from 14C‐aminotriazole, which chromatographed identically to previously described metabolites in Cirsium arvense (L.) Scop. A was further metabolized into B. Labelled aminotriazole and its two metabolites were translocated throughout the plants. Metabolite A was phytotoxic when concentrated and re‐applied to couch grass, but its properties were not those of Unknown II from Cirsium arvense. They were the same as those of Unknown III. Whether or not metabolite A and Unknown III are identical was not established. Migration des substances assimilables marquées au 14 C, du 3 amino‐1,2,4‐triazole et de ses métabolites chez Agropyron repens

Effects of Growth Stage on Translocation of Glyphosate in Quack Grass

“…Only the main-shoot treatment is significantly different at the 5.07o level. A similar relationship has been shown for "CO, assimilates (Fiveland et al 1972 (Forde 1966) or 24 h (Fiveland et al 1972) Fiveland et al (1972) showed that "CO" assimilates were translocated from a treated shoot to an untreated shoot on the same rhizome at the two-to threeleaf stage but not at the five-leaf stage.…”

Assimilate distribution in Poa pratensis L.—a quantitative study

“…From autoradiography (Nyahoza et al,, 1973) and a quantitative experiment in which the rhizome system was separated into horizontal and erected components (Nyahoza, 1971) it appears that the degree of support for rhizomes and young rhizome tillers is related to the proximity of the rhizome to the treated tiller. A similar situation would also seem to apply in other rhizomatous grasses (Forde, 1966;Wolf, 1967;Hull, 1969;Fiveland, Erikson & Seely, 1972). An established rhizome tiller supplied over 50/^ of its exported assimilate to the rhizome system and a small proportion to all the primary tillers and the main axis of the parent plant.…”

“…(Marshall & Sagar, 1965) and Agropyron repens (L.) Beauv. (Forde, 1966). Some quantitative aspects of assimilate movement in P. pratensis are now reported.…”

Effect of Soil Temperature and Moisture on Glyphosate and Photoassimilate Distribution in Quackgrass (Agropyron repens)

“…These measurements were made to monitor the physiological activity of source leaves as influenced by soil temperature treatments. Stomatal diffusive resistance read ings were made on both surfaces of four of the youngest fully expanded leaves of randomly selected shoots with a steady-state porometer 6 . The C0 2 exchange rate was measured by placing two of the youngest fully expanded intact leaves in two transparent polyacrylic chambers (20.6 by 3.7 by 1.7 cm) sealed at the base of each leaf.…”

“…Studies of the transport and distribution of photo assimilates and glyphosate in quackgrass have been conducted, but the effect of soil moisture and soil temperature on these processes has not been investigated (6,16,20).…”