SPECIALIZATION AND LOCAL ADAPTATION OF A FUNGAL PARASITE ON TWO HOST PLANT SPECIES AS REVEALED BY TWO FITNESS TRAITS
SPECIALIZATION AND LOCAL ADAPTATION OF A FUNGAL PARASITE ON TWO HOST PLANT SPECIES AS REVEALED BY TWO FITNESS TRAITS
复制标题
两种适应性特征揭示了真菌寄生虫在两种寄主植物物种上的特化和局部适应
DOI：
10.1111/j.1558-5646.2007.00003.x
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
J. Shykoff
中科院分区：
文献类型：
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作者：
D. Sicard;P. Pennings;C. Grandclément;J. Acosta;O. Kaltz;J. Shykoff
摘要本文研究了真菌寄生物lindemuthianum对Phaseolus vulgaris和P. coccineus两种寄主的适应性特征：感染性（攻击寄主个体的能力）和侵略性（产孢和叶片表面损伤程度）的地理格局。通过交叉接种实验，我们发现真菌在其原生寄主物种上具有这两种特征的专一性，即使是在同域寄主种群上进行的同域寄主种群试验中也是如此。在两种寄主物种中，我们比较了本地和外来植物-真菌组合的感染性和侵袭性。我们发现这两个性状在P. vulgaris上有局部适应的证据，而在P. coccineus上没有。侵染性和侵袭性的局部适应程度之间没有显著的相关性，表明这两种性状的遗传基础和选择效果可能不同。对于两种适合度特征，专业化程度与局部适应程度呈正相关，表明专业化可以通过局部适应来加强。
Abstract We investigate the geographic pattern of adaptation of a fungal parasite, Colletotrichum lindemuthianum, on two host species, Phaseolus vulgaris and P. coccineus for two parasite fitness traits: infectivity (ability to attack a host individual) and aggressivity (degree of sporulation and leaf surface damage). Using a cross-inoculation experiment, we show specialization of the fungus on its host species of origin for both traits even when fungi, which originated from hosts growing in sympatry, were tested on sympatric host populations. Within the two host species, we compared infectivity and aggressivity on local versus allopatric plant–fungus combinations. We found evidence for local adaptation for the two traits on P. vulgaris but not on P. coccineus. There was no significant correlation between the degrees of local adaptation for infectivity and aggressivity, indicating that the genetic basis and the effect of selection may differ between these two traits. For the two fitness traits, a positive correlation between the degree of specialization and the degree of local adaptation was found, suggesting that specialization can be reinforced by local adaptation.