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首页> 外文期刊>Conservation Biology >Consequences of low mate availability in the rare self-incompatible species Brassica insularis
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Consequences of low mate availability in the rare self-incompatible species Brassica insularis

机译：罕见的自交不亲和物种Brassica insularis的配偶利用率低的后果

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Self-incompatibility systems prevent self-fertilization in angiosperms. Although numerous S alleles are usually maintained by negative frequency-dependent selection, the number of S alleles can be low in small populations, which limits mate availability and reduces fecundity in endangered populations of self-incompatible plants. Despite the increasing evidence of the negative effect of self-incompatibility in small populations, the direct link between the number and the distribution of S alleles and their reproductive consequences has been rarely reported. Brassica insularis is a rare self-incompatible species with medium to very small populations. Results of a previous study showed that the smallest population has very few S alleles. We investigated whether reduced mate availability affects reproduction in this species. We compared the pollination success and the fruit set in 4 populations differing in population size and number of S alleles. Our results suggest that reproduction may be negatively affected by the low S-allele diversity in the smallest population. Nevertheless, other populations also had reduced fruit set that could not be attributed to self-incompatibility alone.
机译：自交不亲和系统可防止被子植物自我受精。尽管通常通过负频率依赖性选择来维持许多S等位基因，但在小种群中S等位基因的数量可能很少，这限制了配偶的可利用性并降低了自交不亲和植物的濒危种群的繁殖力。尽管越来越多的证据表明小人群中自我不相容的负面影响，但很少报道S等位基因的数量和分布及其繁殖后果之间的直接联系。芸苔属油菜是一种罕见的自交不亲和种，种群中等至非常小。先前的研究结果表明，最小的人群几乎没有S等位基因。我们调查了减少的配偶可用性是否会影响该物种的繁殖。我们比较了4个种群的传粉成功率和结实率，这些种群的种群大小和S等位基因数量不同。我们的结果表明，繁殖可能受到最小人群中低等位基因多样性的负面影响。然而，其他人群的坐果减少也不能仅仅归因于自我不兼容。

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