The relation of specificity of orchid mycorrhizal fungi to the problem of symbiosis
The relation of specificity of orchid mycorrhizal fungi to the problem of symbiosis
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DOI：
10.2307/2436839
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发表时间：
1939-06-01
影响因子：
3
通讯作者：
Curtis, JT
中科院分区：
文献类型：
--
作者：
Curtis, JT
10种从23个菌株中分离到丝核菌属的10个菌株。来自美国各地的兰花。S.和中美洲。描述了两个新种[长破折号]R. borealis和R.念珠状。没有发现特异性的证据，因为一种兰花可以携带几种真菌，任何一种真菌都能攻击多种兰花。真菌与兰花的生态环境有关，而与兰花种类无关。共生发芽试验，使用从给定的兰花分离的真菌与该兰花的种子相结合，表明在大多数情况下，真菌不能诱导种子发芽。共生关系的结论是寄生和主机之一，与兰花获得没有好处的真菌在其根部。
Ten spp. of Rhizoctonia were isolated from 23 spp. of orchids from various habitats in the U. S. and Central America. Two new species are described[long dash]R. borealis, and R. monilioides. No evidence of specificity was found, as one orchid species could harbor several fungus spp., and any one fungus species could attack a number of different orchids. The fungi were correlated with ecological habitat rather than with orchid species. Symbiotic germination tests, using fungi isolated from a given orchid in combination with the seeds of that orchid, indicated in most cases that the fungi were unable to induce germination of the seed. The symbiotic relationship is concluded to be one of parasite and host, with the orchid deriving no benefit from the fungus in its roots.