Mycorrhizas of Three Species of China''''s Protected Plants at Chebaling''''s Nursery

Root morphology and mycorrhizas of the 3 year old saplings of Tsoongiodendron odorum, Bretschneidera sinensis, and Eurycormbus cavaleriei at the nursery of Chebaling National Nature Reserve were studied. Three species could form vesicular arbuscular mycorrhizas. Their infection rates were 84.4%, 81.1%,55.6%, respectively. These species are different in root morphology, but all of them do not have root hair, which may indicate their high dependence on mycorrhiza. The VAF spore density was low in the soil of the study site. One spore type was isolated from the soil of Eurycormbus cavaleriei and two types were from that of Bretschneidera sinensis . Further study on the ecology of the mycorrhizas of these protected species is of importance in conservation and development of these rare plants.