RELATIONSHIPS AMONG NON-ACREMONIUM SP FUNGAL ENDOPHYTES IN 5 GRASS SPECIES
RELATIONSHIPS AMONG NON-ACREMONIUM SP FUNGAL ENDOPHYTES IN 5 GRASS SPECIES
复制标题
DOI：
10.1128/aem.59.5.1540-1548.1993
复制
发表时间：
1993-05-01
影响因子：
4.4
通讯作者：
SCHARDL, CL
中科院分区：
文献类型：
--
作者：
AN, ZQ;SIEGEL, MR;SCHARDL, CL
许多冷季型禾本科植物（早熟禾亚科）具有母系传播的真菌共生体，这种共生体不会引起已知的病理学，但通常会增强禾本科植物宿主的生态适应性和生化能力。最常描述的内生菌是枝顶孢属（Acremonium）的Albo-lanosa spp。（Acremonium endophytes），其为Epichelium typhina的分生孢子无性型（严格无性形式）。已注意到的其他内生菌是多年生黑麦草（Lolium perenne L.）和高羊茅（Festuca arundinacea Schreb.）在这里，我们报告了在另外三种草种中鉴定出的额外的非枝顶孢属内生菌（在此指定为p-内生菌）：高羊茅（Festuca lutea）、亚利桑那羊茅（Festuca arizonica）和草地羊茅（Festuca pratensis）。在每一个草种中，p-内生菌与枝顶孢属内生菌共生。其rRNA基因的可变部分的血清学分析和序列测定表明，两个先前确定的非枝顶孢属内生菌彼此密切相关，并与新确定的p-内生菌。因此，p-内生菌代表了第二组广泛分布的草共生体。
Many cool-season grasses (subfamily Pooideae) possess maternally transmitted fungal symbionts which cause no known pathology and often enhance the ecological fitness and biochemical capabilities of the grass hosts. The most commonly described endophytes are the Acremonium section Albo-lanosa spp. (Acremonium endophytes), which are conidial anamorphs (strictly asexual forms) of Epichloe typhina. Other endophytes which have been noted are a Gliocladium-like fungus in perennial ryegrass (Lolium perenne L.) and a Phialophora-like fungus in tall fescue (Festuca arundinacea Schreb.). Here, we report the identification of additional non-Acremonium sp. endophytes (herein designated p-endophytes) in three more grass species: Festuca gigantea, Festuca arizonica, and Festuca pratensis. In each grass species, the p-endophyte was cosymbiotic with an Acremonium endophyte. Serological analysis and sequence determinations of variable portions of their rRNA genes indicated that the two previously identified non-Acremonium endophytes are closely related to each other and to the newly identified p-endophytes. Therefore, the p-endophytes represent a second group of widely distributed grass symbionts.