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Annals of Botany 39: 535-545, 1975
© 1975 Annals of Botany Company

RESEARCH-ARTICLE

Tritiated-thymidine Labelled Nuclei in Primordia and Newly-emerged Lateral Roots of Vicia faba L.

R. D. MACLEOD and S. M. MCLACHLAN

Department of Plant Biology, University of Newcastle upon Tyne Newcastle upon Tyne, NE1 7RU

Received: 4 July 1974   

The utilization of 3H-TdR in DNA synthesis and the distribution of labelled nuclei have been determined in large primordia (LP) and newly emerged lateral roots (JE) of Vicia faba following different exposure periods. This nucleoside appears to reach LP and the more basal, unemerged parts of JE by way of the vascular tissue of the primary root, while those parts of JE which project out from the epidermis of the primary obtain 3H-TdR directly from the surrounding medium. The utilization of 3H-TdR in the synthesis of DNA in basal segments of JE is also complicated by the temporary quiescence of nuclei in this part of these meristems as LP elongate to form lateral roots.


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