Reduction in the sex ability of worldwide clonal populations of Puccinia striiformis f.sp tritici
Reduction in the sex ability of worldwide clonal populations of Puccinia striiformis f.sp tritici
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DOI：
10.1016/j.fgb.2010.07.002
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发表时间：
2010-10-01
影响因子：
3
通讯作者：
de Vallavieille-Pope, Claude
中科院分区：
文献类型：
--
作者：
Ali, Sajid;Leconte, Marc;de Vallavieille-Pope, Claude
条锈菌三孢专化型（PST）在美国一直被认为是无性繁殖的，直到最近还没有已知的替代宿主，它具有克隆的种群结构。澳大利亚和欧洲。然而，最近，东亚和中国重组人群的高基因型多样性已被报道。有性生殖能力的变化可以解释基因型多样性的地理梯度。为了解决这一假设，我们测试了存在的能力之间的关系，以产生Telia，性别特异性结构，是强制性的性周期，和使用中性标记测量的人群的遗传多样性，在一组56株代表6个世界各地的地理起源。聚类方法将这些菌株分配到五个遗传组，对应于它们的地理来源，与8个组间杂交个体。代表中国，尼泊尔和巴基斯坦的分离株显示出最高的telial生产，而来自法国和地中海地区的克隆种群显示出非常低的telial生产。在Telial生产的地理晚餐对应于在以前的研究中描述的基因型多样性的梯度，克隆与不同/重组群体之间的Telial生产显示出明显的差异。较高的平均Qst值（0.822）比Fst值（0.317）的Telial生产表明，Telial生产更可能是通过直接或间接的选择，而不是单独的遗传漂变。高telial生产在遗传多样性种群和克隆种群的减少的存在进行了讨论方面的进化性别。PST起源中心及其替代宿主的分布。(C)2010年爱思唯尔公司All rights reserved.
Puccinia striiformis f.sp. tritici (PST), has so far been considered to reproduce asexually with until very recently no known alternate host, has a clonal population structure in the USA. Australia and Europe. However, recently, high genotypic diversity in Eastern Asia and recombinant populations in China has been reported. Variations in the ability for sexual reproduction could provide an explanation for such a geographical gradient in genotypic diversity. In order to address this hypothesis, we tested for the existence of a relationship between the ability to produce telia, sex-specific structures that are obligatory for sexual cycle, and the genetic diversity of populations measured using neutral markers, in a set of 56 isolates representative of six worldwide geographical origins. Clustering methods assigned these isolates to five genetic groups corresponding to their geographical origin, with eight inter-group hybrid individuals. Isolates representing China, Nepal and Pakistan displayed the highest telial production, while clonal populations from France and the Mediterranean region displayed very low telial production. The geographic dine in telial production corresponded to the gradient of genotypic diversity described during previous studies, showing a clear difference in telial production between clonal vs. diverse/recombinant populations. The higher mean Qst value (0.822) for telial production than the Fst value (0.317) suggested that telial production has more probably evolved through direct or indirect selection rather than genetic drift alone. The existence of high telial production in genetically diverse populations and its reduction in clonal populations is discussed with regard to evolution of sex. PST centre of origin and distribution of its alternative host. (C) 2010 Elsevier Inc. All rights reserved.