CHANGES IN FINE STRUCTURE OF CITRUS ROOT CELLS INDUCED BY TYLENCHULUS SEMIPENETRANS BY S. HIMMELHOCH1), E. COHN2), M. MORDECHAI 2), B. M. ZUCKERMAN 3) Electron microscope studies of citrus roots infected with Tylenchulus semipenetrans showed two distinctive symptoms associated with pathogenesis. First was the presence of paracrystalline arrays within plastids. Second was the formation of enlarged, lobed nuclei. These Tylenchulus induced changes are discussed in relation to host reactions to endoparasitism by other plant nematodes. While the gross histopathology on citrus roots by the citrus nematode, T'ylen- chulus semi penetrans, has been described from light microscope studies (Van Gundy & Kirkpatrick, 1964; Cohn, 1965), fine structure changes induced in citrus by T. J6?/?6'?f?.f have not previously been examined. This paper reports on light and electron microscope studies which revealed intracellular changes associated with parasitism by T. _rejrzi?enetsrtrzs. Materials and Methods Seedlings of sour orange (Citrus cturantium L. ) were grown at 250 ° in potted soil naturally infested with T. seiizipeneti-ai7s. The seedlings were 5 weeks old at the inception of the experiment and were harvested for root sampling after 6 and 9 weeks exposure to T. semipeneträ17s. For comparison, sections from nematode infested tissues were compared with
Nematologica – Brill
Published: Jan 1, 1979
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