ULTRASTRUCTURE AND CYTOCHEMISTRY OF HAUSTORIUM OF WHEAT STRIPE RUST
小麦条锈菌吸器超微结构和细胞化学的研究

Ultrastructure of the haustorium and penetration site of wheat stripe rust was studied with electron microscopy and cytochemical methods. Observation results showed that the haustorium consisted of a tube-like neck and an expanded tip body, and the neck and body walls with two layers were continuous in connection and contained polysaccharide. There was a densely stained neck ring on mildway along the neck. It was found through observation that the multinuclei condition in ha-ustoria was very common. Cytochemical staining revealed that the extrahaustorial matrix contained polysaccharide. After the treatment with protease, much densely-sta ined fibrillar material was observed in extrahaustorial matrix. At penetration site, the wall of haustorial mother cell became convex because of local thickening. The penetration peg wall consisted of an inner layer and an outer layer, which were continuous in connection with the sixth and the fifth layers of haustorial mother cell wall respectively. Furthermore, two penetration pegs were occasionally observed on the same penetration site in this research.