MORPHOLOGICAL AND HISTO-ANATOMICAL ASPECTS AT SOME DICOTILEDONATE SEEDLINGS RELATED TO THE VASCULAR TRANSITION
Journal Title: Analele Stiintifice ale Universitatii Alexandru Ioan Cuza din Iasi, Serie noua, Sectiunea II a. Biologie vegetala - Year 2006, Vol 52, Issue 0
Abstract
The authors investigate the morphology and structure of seedlings from 4 different species of herbal dicotyledonate: Mirabilis jalapa L., Pisum sativum L., Ricinus communis L. and Tropaeolum majus L., some with epigeal and some with hipogeal germination. Studying the structure of the vascular system during 21 days from the germination, we distinguished the transformation from the primary structure of the root to the primary structure of the stem, underlining the level where the histological changes take place along the axis of the seedlings, the order in which the xylem vessels appear, extinguish and other appear in different positions. The gathered data support the theory of torsion as well as the theory of desmogenesis. The type of germination does not influence the level where the vascular transition takes place.
Authors and Affiliations
RODICA RUGINĂ, C. TOMA, LĂCRĂMIOARA IVĂNESCU
Keywords
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