Fusarium torreyae sp nov., a pathogen causing canker disease of Florida torreya (Torreya taxifolia), a critically endangered conifer restricted to northern Florida and southwestern Georgia
Fusarium torreyae sp nov., a pathogen causing canker disease of Florida torreya (Torreya taxifolia), a critically endangered conifer restricted to northern Florida and southwestern Georgia
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DOI：
10.3852/12-262
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发表时间：
2013-03-01
期刊：
影响因子：
2.8
通讯作者：
O'Donnell, Kerry
中科院分区：
文献类型：
--
作者：
Aoki, Takayuki;Smith, Jason A.;O'Donnell, Kerry
在2009年对佛罗里达香榧（Torreya taxifolia）的病原体进行调查期间，从影响这种极度濒危针叶树的溃疡病中分离出一种新的镰刀菌属物种，其目前的范围仅限于佛罗里达北方和格鲁吉亚西南部。已发表的多位点分子系统发育分析表明，这种病原体代表了一个系谱排他性的，遗传学上不同的物种，代表了最早的分歧之一，在赤霉病菌分支镰刀菌。此外，完成科赫的假设，建立了这个新的物种是佛罗里达香榧溃疡病的病原体。在这里，我们正式描述这种病原体作为一个新的物种，镰刀菌torreyae。该物种的纯培养物产生长而细长的多隔孢子道分生孢子，表现出形态收敛与两个远亲fusaria，反映了镰刀菌分生孢子形态的homoplasious性质。
During a survey for pathogens of Florida torreya (Torreya taxifolia) in 2009, a novel Fusarium species was isolated from cankers affecting this critically endangered conifer whose current range is restricted to northern Florida and southwestern Georgia. Published multilocus molecular phylogenetic analyses indicated that this pathogen represented a genealogically exclusive, phylogenetically distinct species representing one of the earliest divergences within the Gibberella clade of Fusarium. Furthermore, completion of Koch's postulates established that this novel species was the causal agent of Florida torreya canker disease. Here we formally describe this pathogen as a new species, Fusarium torreyae. Pure cultures of this species produced long and slender multiseptate sporodochial conidia that showed morphological convergence with two distantly related fusaria, reflecting the homoplasious nature of Fusarium conidial morphology.