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KMID : 0368419910340020129
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Journal of Plant Biology
1991 Volume.34 No. 2 p.129 ~ p.136
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Ultrastructural Study on the Haustorial Cells of Cuscuta australis R. Brown in the Region of the Host Parenchyma
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Lee Kyu-Bae
Lee Chai-Doo
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Abstract
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Two cell types, tip cells and hyphal cells, were found at the front of Cuscuta australis endophyte growing into the stem parenchyma of the host plant, Trifolium repens. Each tip cell developed into an elongate, filamentous hypha. The cells of both types possessed a dense cytoplasm including abundant organelles and enlarged nuclei with the deeply lobed envelope. The unevenly thick walls were observed in certain tip cells. The wall penetrated through the middle lamellase of the host cells and engulfed the debris of broken host cells. Some front cells had the plasmalemma-wall invaginations, which increased the surface area and would facilitate material uptake from the host. No plasmodesmata between the host and parasite cells were found; instead, an apoplastic continuity was established by fused cell walls at the interface of the two partners. The apoplast was thought to be the main route for water and nutrients transport.
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