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- Title
Characterization and colonization of endomycorrhizal Rhizoctonia fungi in the medicinal herb Anoectochilus formosanus (Orchidaceae).
- Authors
Jiang, Jr-Hau; Lee, Yung-I; Cubeta, Marc; Chen, Lung-Chung
- Abstract
The medicinal effects and techniques for cultivating Anoectochilus formosanus are well-documented, but little is known about the mycorrhizal fungi associated with A. formosanus. Rhizoctonia ( Thanatephorus) anastomosis group 6 (AG-6) was the most common species isolated from fungal pelotons in native A. formosanus and represented 67 % of the sample. Rhizoctonia ( Ceratobasidium) AG-G, P, and R were also isolated and represent the first occurrence in the Orchidaceae. Isolates of AG-6, AG-R, and AG-P in clade I increased seed germination 44-91 % and promoted protocorm growth from phases III to VI compared to asymbiotic treatments and isolates of AG-G in clade II and Tulasnella species in clade III. All isolates in clades I to III formed fungal pelotons in tissue-cultured seedlings of A. formosanus, which exhibited significantly greater growth than nonmycorrhizal seedlings. An analysis of the relative effect of treatment ( $$ {\widehat{p}}_i $$) showed that the low level of colonization ( $$ {\widehat{p}}_i = 0.30\hbox{--} 0.47 $$) by isolates in clade I resulted in a significant increase in seedling growth compared to isolates in clades II (0.63-0.82) and III (0.63-0.75). There was also a negative correlation ( r = −0.8801) with fresh plant weight and fungal colonization. Our results suggest that isolates in clade I may represent an important group associated with native populations of A. formosanus and can vary in their ability to establish a symbiotic association with A. formosanus. The results presented here are potentially useful for advancing research on the medicinal properties, production, and conservation of A. formosanus in diverse ecosystems.
- Subjects
ORCHIDS; MICROBIOLOGY; PLANTS; ENDOGONE mosseae; RHIZOCTONIA; FUNGAL colonies; MEDICINAL plants
- Publication
Mycorrhiza, 2015, Vol 25, Issue 6, p431
- ISSN
0940-6360
- Publication type
Article
- DOI
10.1007/s00572-014-0616-1