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Anatomy of the latex system in the dormant embryo of euphorbia marginata correlative analysis of the histological organization and topographic distribution of laticifers


, : Anatomy of the latex system in the dormant embryo of euphorbia marginata correlative analysis of the histological organization and topographic distribution of laticifers. Annals of Botany (London) 42(181): 1099-1108

The anatomy, morphology and topography of lacticifers in the mature embryo of E. marginata were studied by conventional and fluorescence microscopy. The mature embryo consists of a well-developed embryonic axis and 2 cotyledons and it contains differentiating vascular tissue. In the hypocotyl, 6 procambial strands are present which branch and extend into the cotyledons, whereas in the root they are fused in a triarch structure. In the embryonic axis, the latex system consists of stelar and cortical components that are 1st anastomized in a cotyledonary plexus and then are joined above in a cotyledonary system. The stelar and cortical systems are linked by horizontal branches to a nodal latex plexus placed under the epicotylary meristem. All the vascular lacticifers, 24 in number, end unbranched in the apex of the radicle. The cortical laticifers are profusely branched toward the epidermis in tiny veins as far as the sub-epidermal level. The cotyledonary laticifers follow the vascular tissue and form a network surrounding the mesophyllary areoles. The criteria which determine the constitution of the latex system are only the essential peculiarities of idioblasts, but also correlative phenomena between growing lacticifers and surrounding tissues. The stelar system appears to be under the control of vascular polar growth, while the cortical and cotyledonary latex systems seem subjected both to endogenous polar stimuli and to extra-embryonal influences.

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