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首页> 外文期刊>Flora >No inbreeding depression in an outcrossing alpine species: The breeding system of Campanula thyrsoides
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No inbreeding depression in an outcrossing alpine species: The breeding system of Campanula thyrsoides

机译：交配的高山物种中没有近交性抑郁症：风铃甲状腺的繁殖系统

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Plants that live in fragmented landscapes, where populations are isolated from each other and in which long-distance dispersal is essential for colonization of empty sites, reproduction should be favoured by self-compatibility (Baker's law). Nevertheless, outcrossing mechanisms, such as self-incompatibility and dichogamy, are common in many species and are often maintained by inbreeding depression in the fitness of selfed progeny. Here, we studied the breeding system and the consequences of selfing and sister mating in Campanula thyrsoides, a short-lived perennial monocarp, which is found in the naturally fragmented landscape of the Alps. An experiment with controlled pollinations was set up in the common garden with plants grown from seeds originating from 14 seed families, collected in the siliceous Central Alps, where this plant is found on isolated carbonate bearing outcrops. Our results indicate that C thyrsoides has a strong self-incompatibility system (SI) with no or low seed set in selfed flowers compared to outcrossed and sister-crossed flowers. Moreover, the SI system in C thyrsoides did not break down with flower age as in some other Campanula species. Surprisingly, there was no significant difference in seed set, seed weight, germination percentage, seedling survival and size between outcrossed and sister-crossed offspring, which indicates no inbreeding depression. We suggest that the absence of inbreeding depression in this outcrossing species might be a result of frequent bottlenecks during colonization of the isolated habitats in the alpine landscape. (C) 2007 Elsevier GmbH. All rights reserved.
机译：生活在零散的景观中的植物，这些植物之间的种群相互隔离，并且长距离分散对于空地的定居是必不可少的，繁殖应受到自我相容性的支持（贝克定律）。然而，异交机制，例如自交不亲和和两性配偶，在许多物种中很常见，并且通常通过近交性抑郁来维持自交后代的能力。在这里，我们研究了短寿命的多年生单果风铃（Campanula thyrsoides）的繁殖系统以及自交和姐妹交配的后果，这是在阿尔卑斯山自然零散的景观中发现的。在公共花园中建立了一个可控的授粉试验，该植物的种子来自14个种子科的种子，生长在硅质的中央阿尔卑斯山中，那里的植物生长在孤立的碳酸盐露头上。我们的结果表明，与异交和姐妹杂交的花相比，C thyrsoides具有很强的自交配系统（SI），自交花中没有种子或种子集很少。而且，C类甲状腺的SI系统并没有像其他风铃树种那样随着花龄而分解。出人意料的是，异交和姊妹杂交后代的种子结实，种子重量，发芽率，幼苗存活率和大小没有显着差异，这表明无近交衰退。我们建议，在这种异交物种中缺乏近交衰退可能是由于在高山景观中孤立栖息地定居期间频繁出现瓶颈所致。 （C）2007 Elsevier GmbH。版权所有。

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