| Abstrakt: |
Abstract: In controlled environment growth chambers, the effects of foliar and root applications of 2-chloroethyltrimethylammonium chloride (CCC) and 2,4-dichlorobenzyltributylphosphonium chloride (Phosfon) on the translocation of 32P fed to leaves, were investigated. When applied to leaves or to root, CCC had no effect on the relative amounts of 32P radioactivity retained by the fed leaf 5, 20 and 80 h after feeding. At 20 and 80 h after feeding, Phosfon concentrations of 0.01 and 0.1mg l-1 reduced retention of the applied 32P. 80 h after 32P feeding, CCC concentration of 1 mg l-1 applied as a foliar spray or to the root enhanced the downward movement of 32P. Phosfon at low concentrations, particularly at 0.1 mg l-1, on the other hand, favoured an upward transport of the applied32P. Foliar applications of CCC and Phosfon at high concentrations had no significant effect on 32P transport to the root and the shoot below the fed leaf, while root applications of CCC and of Phosfon inhibited downward transport. Root applications generally caused greater alterations in 32P distribution patterns than did foliar applications. On the basis of total active ingredient uptake, Phosfon was more effective than CCC in altering translocation patterns. |
