Genealogical concordance between the mating type locus and seven other nuclear genes supports formal recognition of nine phylogenetically distinct species within the Fusarium graminearum clade
Genealogical concordance between the mating type locus and seven other nuclear genes supports formal recognition of nine phylogenetically distinct species within the Fusarium graminearum clade
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DOI：
10.1016/j.fgb.2004.03.003
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发表时间：
2004-06-01
影响因子：
3
通讯作者：
Aoki, T
中科院分区：
文献类型：
--
作者：
O'Donnell, K;Ward, TJ;Aoki, T
通过对包括交配型（MAT）基因座在内的11个核基因部分的DNA序列进行系统发育分析，研究了禾谷镰刀菌进化枝（Fg进化枝）内的物种限制。9个不同的物种在Fg进化枝内被解析，它们都具有连续的MAT 1 -1和MAT 1 -2自型，与同宗配合的生殖模式一致。与此相反，只有一个的两个MAT独特型被发现在其他五个物种，其中四个是pupericasexualic，和其他异宗配合。分子进化分析表明，MAT基因是在强大的净化选择，他们在功能上受到限制，即使在物种的性状态是未知的。同宗生殖支持这支内同宗配合的单系和近形起源。形态学分析表明，分生孢子特征的组合可以用来区分三个种和三个种对。物种排名正式提出了八个无名物种内的Fg分支使用固定的核苷酸字符。爱思唯尔公司出版
Species limits were investigated within the Fusarium graminearum clade (Fg clade) through phylogenetic analyses of DNA sequences from portions of 11 nuclear genes including the mating-type (MAT) locus. Nine phylogenetically distinct species were resolved within the Fg clade, and they all possess contiguous MAT1-1 and MAT1-2 idiomorphs consistent with a homothallic reproductive mode. In contrast, only one of the two MAT idiomorphs was found in five other species, four of which were putatively asexual, and the other was heterothallic. Molecular evolutionary analyses indicate the MAT genes are under strong purifying selection and that they are functionally constrained, even in species for which a sexual state is unknown. The phylogeny supports a monophyletic and apomorphic origin of homothallism within this clade. Morphological analyses demonstrate that a combination of conidial characters could be used to differentiate three species and three species pairs. Species rank is formally proposed for the eight unnamed species within the Fg clade using fixed nucleotide characters. Published by Elsevier Inc.