State University of New York-Environmental Science and Forestry, 1 Forestry Drive, Syracuse, NY 13210, USA.
Mycorrhiza. 2012 Jul;22(5):393-402. doi: 10.1007/s00572-011-0414-y. Epub 2011 Oct 12.
Like other myco-heterotrophic plants, Pterospora andromedea (pinedrops) is dependent upon its specific fungal symbionts for survival. The rarity of pinedrops fungal symbiont was investigated in the eastern United States where pinedrops are rare. Wild populations of eastern pinedrops were sampled, and the plant haplotypes and fungal symbionts were characterized with molecular techniques; these data were compared to those from the West with phylogenetic analyses. The frequency of the fungal symbiont in eastern white pine forests was assessed using a laboratory soil bioassay and in situ pinedrops seed baiting. Only one plant haplotype and fungal symbiont was detected. The plant haplotype was not unique to the East. The fungal symbiont appears to be a new species within the genus Rhizopogon, closely related to the western symbionts. This fungal species was not frequent in soils with or without pinedrops, but was less frequent in the latter and in comparison to the fungal symbionts in western forests. Seed baiting resulted in few germinants, suggesting that mycelial networks produced by the eastern fungal symbiont were rare. Results suggest that eastern pinedrops rarity is influenced by the distribution and rarity of its fungal symbiont.
与其他菌根异养植物一样，Pterospora andromedea（松萝凤梨）依赖于其特定的真菌共生体才能生存。在松萝凤梨罕见的美国东部，研究了其真菌共生体的稀有性。采集了东部松萝凤梨的野生种群样本，并通过分子技术对植物单倍型和真菌共生体进行了特征描述；利用系统发育分析，将这些数据与西部的数据进行了比较。使用实验室土壤生物测定法和原位松萝凤梨种子诱捕法评估了东部白松林中真菌共生体的频率。仅检测到一种植物单倍型和真菌共生体。该植物单倍型并非东部特有。真菌共生体似乎是 Rhizopogon 属中的一个新物种，与西部的共生体密切相关。该真菌种在有或没有松萝凤梨的土壤中并不常见，但在后一种情况下比在西部森林中的真菌共生体更不常见。种子诱捕的萌发物很少，这表明东部真菌共生体产生的菌丝网络很少。研究结果表明，东部松萝凤梨的稀有性受到其真菌共生体的分布和稀有性的影响。
