石耳目地衣内生菌的系统发育学分析

摘要

从采自中国和美国的13种石耳目地衣的21份标本中分离得到了33株黑化真菌.基于ITS序列的系统发育分析表明,这33株真菌全部是属于Capronia属的成员,可能分别属于12个种.分析结果还发现,这些真菌可能是地表体中广泛而稳定定植的内生菌,其与宿主菌之间存在着一定程度的选择性,同种内生菌的不同成员可能在同一地衣体中先后多次定植.这些内生菌株中的多数是自由生活的石生真菌的近亲,而不是植物内生菌在地衣体中的延伸者.%We acquired 33 melanized fungi isolated from 21 specimens of 13 Umbilicariales from China and U.S.ITS nrDNA sequences based analysis indicates that all these fungi belong to 12 Capronia species.Analysis results also show that these fungi may be constant endophytic fungi and some selections exist between them and their host fungi.Different members of the same species of endophytic fungus may colonize in identical lichen for many times.Most of these endophytic fungi are close relatives of free-living saxicolous fungi, not the extenders of endophytic fungi in lichen.