STUDIES ON THE CELL ULTRASTRUCTURE IN THE COURSE OF GASTRODIA ELATA DIGESTING MYCENA OSMUNDICOLA LANGE AND ARMILLARIA MELLEA FR.
天麻消化紫萁小菇及蜜环菌过程中细胞超微结构变化的研究

Seed germination in G.elata depends on the existence of M.osmundicola in the infected embryonic cells of the plant.However,further growth of the plant corms only occurs after the invasion of A.mellea.In the present study,the ultrastructural changes in the plant cell-fungus were investigated by means of electron-microscopy at the early stage of G.data development.The result showed that disappearance of organelles and development of a great number of sacs could be noticed in the embryonic cells after the infection of M. osmundicola.The sacs enclosed and then digested the hyphae,turning some of them into em- pty cavities by destroying their cytoplasm.The way of digesting M.osmundicola by corm cells was the same as in embryonic cells.When A.mellea entered the vegetative propagative corms,cortex cells producted many grains or sacs which surrounded A.mellea hyphae and collapsed them at last.The survival hyphae from cortex cells entered the large cells,the va- cuoles in those cells completed the final digestion of the hyphae.M.osmundicola and A.mellea infected and supplied nutrition successively for sexual and asexual reproduction of G.data, but the changes of cell structure and the ways of hyphae being digested were different.