Convergent origins of ambrosia fungi
Convergent origins of ambrosia fungi
复制标题
DOI：
10.2307/3761153
复制
发表时间：
1996-07-01
期刊：
影响因子：
2.8
通讯作者：
Blackwell, M
中科院分区：
文献类型：
--
作者：
Cassar, S;Blackwell, M
Ambrosiella属似乎是非单系的证据的基础上，来自核编码的小亚基（18S）rDNA序列的字符的分支分析。对放线菌酮的不同敏感性也支持这一结论。本文报道了六种Ambrosiella（A. brunnea、黑果草A.苏卡蒂、A. gnathotrichi、A. sulfurea，A. macrospora和A. ips）与Ophiostoma（Ophiostomatales）物种密切相关，并显示放线菌酮耐受性。三个物种（A。xylebori、木霉A. ferrugelae和A. hartivalus）与Ceratocystis（Microascales）相关，并且对放线菌酮不耐受。在无性Ambrosiella物种之间的形态特征的基础上确定单系群的困难平行，他们的近性亲属Ophiostoma或Ceratocystis，也被认为是密切相关的过去。这一发现强调了强大的选择压力的作用，昆虫传播功能，不仅为性状态，但孢子和酵母的形式，以及。
The genus Ambrosiella appears to be nonmonophyletic based on evidence from cladistic analysis of characters derived from nuclear encoded small subunit (18S) rDNA sequences. The conclusion also is supported by differential sensitivity to cycloheximide. Six species of Ambrosiella (A. brunnea, A. sulcati, A. gnathotrichi, A. sulfurea, A. macrospora, and A. ips) are closely related to species of Ophiostoma (Ophiostomatales) and show cycloheximide tolerance. Three other species (A. xylebori, A. ferruginea, and A. hartigii) are related to Ceratocystis (Microascales) and are intolerant of cycloheximide. The difficulty in determining monophyletic groupings based on morphological characters among the asexual Ambrosiella species parallels that of their close sexual relatives Ophiostoma or Ceratocystis that also had been considered closely related in the past. This finding emphasizes the role of strong selection pressure for insect dispersal features, not only for sexual states, but for conidial and yeast forms as well.