| acid phosphatase and esterase activity in orchid mycorrhiza. | a cytochemical study was made to examine the possibility that acid phosphatase may be specifically involved in the digestion of endophytic hyphae in orchid mycorrhiza. esterase activity was studied for comparison. frozen sections of unfixed or glutaraldehyde-fixed protocorms of dactylorhiza purpurella infected by thanatephorus cucumeris (rhizoctonia solani) were reacted for acid naphthol as bi phosphatase, acid β-glycerophosphatase or naphthol as d esterase.a marked increase in particulate acid ... | 1973 | 24469896 |
| fine structure of the host-fungus interface in orchid mycorrhiza. | electron microscopy of protocorms of dactylorhiza purpurella infected with a symbiotic rhizoctonia sp. showed that the intracellular hyphae examined did not penetrate the plasmalemma of the host cell. walls of hyphae within cells bore many hemispherical protuberances over which the host plasmalemma was closely pressed. we estimate that these protuberances would increase the area of contact between hyphae and host plasmalemma by about 15%. they were not found on hyphae growing on agar. except for ... | 1971 | 24488192 |
| induced dna synthesis in orchid mycorrhiza. | the distribution of dna values in the cortex of mycorrhizal and non-mycorrhizal roots of dactylorhiza purpurella and spathoglottis plicata has been studied by feulgen microdensitometry. endoreduplication occurs during differentiation of cortical parenchyma. nuclei with two or four times the normal dna content are present in infected and adjacent uninfected cells. autoradiography following (3)h-thymidine incorporation showed that dna synthesis is induced in fully differentiated cortical cells of ... | 1970 | 24500303 |