Structure et ultrastructure de l'haustorium duStriga hermonthica, une scrophulariaceacute;e parasite du mil (Pennisetum typhoides)

摘要

Striga hermonthica(Del.) Benth., (Scrophulariaceae) a parasite of pearl millet (Pennisetum typhoides(Burm.) Stapf and Hubb.), is attached to its host roots by suckers (also called haustoria). The anatomy and ultrastructure of the haustoria described in this study, including the cytology of such haustorial features as intrusive cells, intertracheidal parenchymatous cells, axial vascular core, hyalin tissue, and radial vascular system. Investigations with both electron and fluorescence microscopy did not disclose the presence of phloem. This lack is considered to be a common feature of the haustoria of parasitic Scrophulariaceae.