Orchid Protocorms Research Articles

ASYMBIOTIC GERMINATION OF ORCHID SEEDS ON CARBOHYDRAES OF FUNGAL ORIGIN

SUMMARYAsymbiotic germination of two orchid species on sugars found in orchid mycorrhizal fungi was studied. Trehalose and glucose both provided a satisfactory carbon source for growth of non‐photosynthetic orchid protocorms while mannitol did not.

Penetration and Infection of Orchid Protocorms by Thanatephorus cucumeris and Other Rhizoctonia Isolates

Penetration and Infection of Orchid Protocorms by Thanatephorus cucumeris and Other Rhizoctonia Isolates

DNA Content of Nuclei in Orchid Protocorms symbiotically infected with Rhizoctonia

DESCRIPTIONS of orchid mycorrhiza consistently report the phenomenon of nuclear hypertrophy in infected host cells1–4, but there has been no quantitative analysis of the system. Recent demonstration of several nuclear DNA classes in non-infected post-germination protocorms5 suggests that endoreduplication may be a normal developmental feature of orchids.