New Lineages of Elaphocordyceps Harboring in Lichen Thalli

doi:10.7677/ynzwyj201515045

Abstract

Abstract:

All species of Elaphocordyceps parasitize the fungal genus Elaphomyces, except for three species growing on scarabid beetle larvae or cicada nymphs. During our study on the diversity of culturable endolichenic fungi, some Elaphocordyceps species are found widely harboring in lichen thalli. A total of 64 fungal strains belonging to Elaphocordyceps were isolated from 42 lichen samples respectively collected from 5 provinces of China and the Antarctic. Phylogenetic analysis based on ITS nrDNA shows that these endolichenic fungi are possibly heterospecific. The endophytic fungi of plant often provide benefits to their hosts. However, the endolichenic fungi may be parasites or nutrient competitors of the mycobiont, because they have to obtain nutrient components from mycobionts or photobionts. Our study partly proves this hypothesis, since most known species of Elaphocordyceps are parasites of fungi.

Key words: Cordyceps, Endolichenic fungi, Fungal host, ITS

摘要：

大团囊虫草是一类寄生型真菌，绝大多数以大团囊菌为宿主，只有3个种寄生在甲虫和蝉的幼虫体内。我们从采集自中国五个省份和南极长城站的42份地衣标本中分离得到了64株大团囊虫草属真菌菌株，系统发育学分析表明，这些真菌可能不是相同的种类，显示有多个种类的大团囊虫草属真菌广泛定植于地衣体中。与高等植物共生的内生真菌通常对宿主的生长起到促进作用，然而，由于地衣内生真菌生长所需营养物质来源于地衣共生真菌或光合共生物，因此地衣内生真菌与共生真菌之间很有可能是寄生关系或竞争关系。本研究发现大团囊虫草广泛伴生在地衣体内，部分证实了这一假说的正确性。

关键词: 虫草属, 地衣内生真菌, 真菌宿主, ITS序列

CLC Number:

Q 949.32

JIANG Dai-Feng-, ZHAO Lu-, GUO Hong-, WANG Hai-Ying. New Lineages of Elaphocordyceps Harboring in Lichen Thalli[J]. Plant Diversity, 2015, 37(06): 746-750.

姜岱峰1, 赵璐2, 郭虹3, 王海英1. 定植于地衣体内的大团囊虫草新谱系[J]. Plant Diversity, 2015, 37(06): 746-750.

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