Chaboudez Pierre, Burdon J J
CSIRO Biological Control Unit, Campus International de Baillarguet, F-34982, Montferrier-sur-Lez, France.
Oecologia. 1995 Jun;102(4):490-493. doi: 10.1007/BF00341361.
This study investigated the occurrence of the rust fungus Puccinia chondrillina in clonal populations of its host plant, Chondrilla juncea. In 16 populations spread across eastern Turkey, 48 different multilocus isozyme phenotypes were identified in the host. Of these clones, 88% were restricted to single localities, while the remaining 12% were found in 2-11 populations. For 13 of the 16 plant populations the commonest host clone was always infected. Indeed, at ten sites this clone was the only one found to carry disease. In the remaining three populations the rusted plants were all of the second commonest isozyme type. The possibility of such a tight association of rust incidence with host clone frequency simultaneously across a wide geographic area is very low (P≦0.023), supporting the contention that the pathogen P. chondrillina may be imposing negative frequency-dependent selection on these C. juncea populations.
本研究调查了锈菌软骨草柄锈菌在其寄主植物灯心草粉苞苣的克隆种群中的发生情况。在土耳其东部分布的16个种群中，在寄主中鉴定出48种不同的多位点同工酶表型。在这些克隆中，88%局限于单个地点，而其余12%出现在2至11个种群中。在16个植物种群中的13个中，最常见的寄主克隆总是被感染。事实上，在10个地点，这个克隆是唯一被发现携带病害的克隆。在其余三个种群中，生锈的植物都是第二常见的同工酶类型。在如此广泛的地理区域内，锈病发生率与寄主克隆频率同时紧密关联的可能性非常低（P≤0.023），这支持了病原体软骨草柄锈菌可能对这些灯心草粉苞苣种群施加负频率依赖选择的观点。
