ibclogo XVI International Botanical Congess


Abstract Number: 5288
Session = 7.16.1


ENDODERMIS, HYPODERMIS, AND PERMEABILITY IN WETLAND PLANT ROOTS.


Seago, James L., Jr. SUNY at Oswego, New York, USA, and Peterson, Carol A., University of Waterloo, Ontario, Canada


The structural features of the mature adventitious root cortex and apoplastic permeability have been determined for two wetland plants of differing habitats: Nymphaea odorata and Caltha palustris. At maturity, N. odorata roots have an endodermis with Casparian bands, an extensive aerenchyma with hexagonal lacunae and astrosclereids, and a hypodermis with its uniseriate exodermis with Casparian bands and suberin lamellae. The roots of C. palustris have an endodermis with Casparian bands, a non-aerenchymatous cortex except in old roots where schizogenous lacunae may appear, and a uniseriate exodermis with Casparian bands and suberin lamellae. In old roots, the movement of dyes into the cortex was blocked at the outer edges of the exodermis.


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