A quantitative study of the movement of 2,4-D and assimilates was made using radiocarbon-labelled materials. At the two-three leaf stage of wheat (cv Koga II) 2,4-D moved more slowly than assimilates, but the patterns of movement were very similar. At the five-six leaf stage of the cereal there were differences between 2,4-D and assimilates in the patterns of distribution from leaf 1 and from a leaf on a tiller. In both cases relatively less 2,4-D moved into roots than would have been predicted from knowledge of assimilate movement. Total amounts of 2,4-D reaching the roots did not differ significantly between growth stages but due to root growth, the concentration of radio-activity in the roots fell.
Influence de I'Sge de la plante sur le mouvement du 2,4-D et des produits assimilis dans le bliUne £tude quantitative du mouvement du 2,4-D et des produits assimilis a £t6 faite en utilisant des produits marqu6s au carbone radioactif. Au stade deux-trois feuilles du bl6 (cv. Koga II), le 2,4-D se d6place plus lentement que les produits assimil6s, mais les sch6mas du mouvement ont 6t6 tr6s similaires. Au stade cinq-six feuilles de la c6r6ale, il a 6t6 constat6 une difference entre le 2,4-D et les produits assimil6s dans les schdmas de distribution depuis la feuille 1, et depuis une feuille sur une table. Dans les deux cas, la quantity de 2,4qui a migr6 jusque dans les racines a 6t6 relativement moindre que ce qui aurait pu €tre diduit de la connaissance du mouvement des produits assimiI6s. Les quantit6s totales de 2,4-D atteignant les racines n'ont pas diff6r6 significativement entre les stades de croissance, mais, en raison de la croissance des racines, la concentration de la radioactivity dans les racines a diminu6.
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