TRANSPORT OF C-14 SUCROSE AND C-14 BENZYL ADENINE IN WINTER-WHEAT (TRITICUM-AESTIVUM L) IN THE PREANTHESIS PERIOD

The transport and distribution of 14C‐sucrose and 14C‐BA were studied in internode segments with ear of two winter wheat cultivars with a different mass of kernels in the period prior to anthesis. Both labelled substances were transported intensively into all the developing parts of the car, namely the rachis became the main site of 14C‐BA accumulation. While the difference in the transport of l4C‐sucrose among the cultivars was not unambiguous, a more intensive transport of 14C‐BA was observed in the cultivar with a simultaneously higher mass of 1000 kernels. The higher level of zeatin and zeatin riboside in kernels detected in this cultivar suggested that in the period before anthesis it could accumulate (due to intensive transport, probably from the roots) an important part of cytokinins, available for the early stages of kernel development. Copyright © 1990, Wiley Blackwell. All rights reserved