Tracking costs of virulence in natural populations of the wheat pathogen, Puccinia striiformis f.sp.tritici.
Tracking costs of virulence in natural populations of the wheat pathogen, Puccinia striiformis f.sp.tritici.
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DOI：
10.1186/1471-2148-9-26
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发表时间：
2009-01-30
影响因子：
3.4
通讯作者：
Enjalbert J
中科院分区：
文献类型：
--
作者：
Bahri B;Kaltz O;Leconte M;de Vallavieille-Pope C;Enjalbert J
适应成本在宿主-寄生虫共同进化中起着重要作用。对于寄生虫来说，进化出规避宿主抗性的能力可能会与随后的生长或传播相权衡。这种毒力的代价（植物病理学意义上的）限制了所有感染性基因型的传播，从而有利于维持宿主和寄生虫的遗传多态性。研究了小麦条锈菌三种毒力因子对小麦产量的影响。在成对竞争实验中，我们比较了不同的一个单一的毒力因子的近等基因型的健身。在缺乏相应抗性基因的情况下，两种毒力因子（vir 4、vir 6）造成了巨大的适应性成本。与此相反，vir9毒力因子赋予了强大的竞争优势，几个菌株，这对于不同的宿主品种和生长季节。在某种程度上，实验得出的健身成本和效益是一致的频率变化，这些毒力因子在法国病原体的人口。我们的研究结果说明了毒力突变的进化轨迹的变化和补偿突变的潜在作用。预测这种可变的进化结果是植物育种策略的一个重大挑战。更一般地说，我们认为，农业patho系统可以提供有价值的见解（共）进化过程中的主机寄生虫系统。
Costs of adaptation play an important role in host-parasite coevolution. For parasites, evolving the ability to circumvent host resistance may trade off with subsequent growth or transmission. Such costs of virulence (sensu plant pathology) limit the spread of all-infectious genotypes and thus facilitate the maintenance of genetic polymorphism in both host and parasite. We investigated costs of three virulence factors in Puccinia striiformis f.sp.tritici, a fungal pathogen of wheat (Triticum aestivum). In pairwise competition experiments, we compared the fitness of near-isogenic genotypes that differed by a single virulence factor. Two virulence factors (vir4, vir6) imposed substantial fitness costs in the absence of the corresponding resistance genes. In contrast, the vir9 virulence factor conferred a strong competitive advantage to several isolates, and this for different host cultivars and growing seasons. In part, the experimentally derived fitness costs and benefits are consistent with frequency changes of these virulence factors in the French pathogen population. Our results illustrate the variation in the evolutionary trajectories of virulence mutations and the potential role of compensatory mutations. Anticipation of such variable evolutionary outcomes represents a major challenge for plant breeding strategies. More generally, we believe that agro-patho-systems can provide valuable insight in (co)evolutionary processes in host-parasite systems.
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影响因子：
8.8
作者：
Gandon, S
通讯作者：
Gandon, S
DOI：
10.1046/j.1471-8286.2002.00322.x
发表时间：
2002-12-01
期刊：
MOLECULAR ECOLOGY NOTES
影响因子：
--
作者：
Enjalbert, J;Duan, X;Solignac, M
通讯作者：
Solignac, M
DOI：
10.1051/agro:2000176
发表时间：
2000-11-01
期刊：
AGRONOMIE
影响因子：
--
作者：
Bayles, RA;Flath, K;de Vallavieille-Pope, C
通讯作者：
de Vallavieille-Pope, C
影响因子：
3.5
作者：
Bai, JF;Choi, SH;Leach, JE
通讯作者：
Leach, JE
影响因子：
3.2
作者：
DEVALLAVIEILLEPOPE, C;HUBER, L;GOYEAU, H
通讯作者：
GOYEAU, H