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Fetene, M; Benker, C; Beck, E: The pathway of assimilate flow from source to sink in Urtica dioica l, studied with 14C under ambient atmospheric conditions, Annals of Botany, 79, 585-591 (1997), doi:10.1006/anbo.1996.0392
Abstract:
The contribution of individual vascular bundles of the stem to the flow of assimilates from a selected source leaf to the sink regions was investigated inUrtica dioicaL., a plant with a decussate leaf arrangement. Two homologous sets of eight vascular strands were recognized, arranged in mirror symmetry in the stem internodes. In each set, three of the bundles were identified as traces of one leaf merging into the vascular system of the stem one node below the origin of the leaf. The main bundle of a stem-half bifurcates at each end of the internode into two subdominant bundles, which combine in the next but one node to form the dominant bundle again. Each set of vascular strands also contains two minor bundles which pass more or less without interruption through the whole stem.

Letzte Änderung 02.07.2020