Ultra-thin sections of the leaf curl tissue of peach (Prunus persica SIEB. et ZUCC. var. vulgaris MAXIM.) infected with Taphrina deformans (BERKELEY) TULASNE Were investigated by means of an electron-microscope.
Pathogens (Figs. 1-4. H) were recognized in inter-cellular spaces (Figs. 1 -4. CS), middle lamella (Fig. 2) and cell walls (Fig. 3. CW) of the suscept tissue. Cell wall and cell membrane of the suscept cell was not invaginated and also haustorial structure was not observed. Suscept tissue consists of hypertrophied cells and young cells. Hypertrophied cell had a central vacuole (Figs. 1, 4, 5, 6, 7. V) and a thin peripheral layer of cytoplasm. Sometimes, nucleus had two nucleoli (Fig. 5). Starch grains (S) and rarely, lamellar structures were recognized in the chloroplasts (Figs. 6, 7. CH) of the hypertrophied cells. On the other hand, young cell had not a central vacuole. Golgi bodies (Figs. 8, 9. G), finger-print like pattern (Figs. 9, 15. FP) and various plastids, i. e. proplastid (P) and chloroplasts (CH) were found in the cytoplasm. Osmiophilic granules (OS) were observed inall plastids (P, CH) and sometimes, vacant spaces (VS) were found in the chloroplasts (Figs. 13, 14).