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首页> 外文期刊>Conservation Biology >Spontaneous Interspecific Hybridization and Patterns of Pollen Dispersal in Ex Situ Populations of a Tree Species (Sinojackia xylocarpa) that is Extinct in the Wild
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Spontaneous Interspecific Hybridization and Patterns of Pollen Dispersal in Ex Situ Populations of a Tree Species (Sinojackia xylocarpa) that is Extinct in the Wild

机译：自然灭绝的野生树种（Sinojackia xylocarpa）异地种群的自发种间杂交和花粉分散模式

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Abstract: For endangered plants interspecific hybridization occurring in ex situ collections may lead to failure of reintroduction actions. We used Sinojackia xylocarpa, a well documented Chinese endemic species that is extinct in the wild, as a model case to address this concern. We used paternity analyses to assess the spontaneous hybridization and patterns of pollen flow between S. xylocarpa and its congener species, S. rehderiana, in conserved populations in Wuhan Botanic Garden. Interspecific hybridization events were detected in seven out of eight maternal trees of S. xylocarpa, and an average of 32.7% seeds collected from maternal trees of S. xylocarpa were hybrids. The paternity of 93 out of 249 seedlings from S. xylocarpa assigned to S. rehderiana provided convincing evidence that spontaneous interspecific hybridization occurred extensively in the living garden collection we studied. Different patterns of pollen dispersal (predominantly short-distance vs. long-distance pollination) were observed between intra- and interspecific hybridization events in the garden. Pollen dispersal within the ex situ populations was not restricted by distance, as evidenced by a lack of significant correlations between the average effective pollen dispersal distance (δ) and the geographic distances (d1 and d2) between maternal and paternal trees. The interspecific pollen-dispersal distance ranged from 10 to 620.1 m (mean 294.4 m). Such extensive hybridization in ex situ collections could jeopardize the genetic integrity of endangered species and irrevocably contaminate the gene pool if such hybrids are used for reintroduction and restoration. We recommend strongly that measures be taken to minimize the genetic risks of this kind of hybridization, including establishing buffer zones in ex situ collections, manipulating flowering phenology, testing seed lots before use in reintroduction programs, and controlling pollination for seed purity.
机译：摘要：对于濒临灭绝的植物，在异地采集中发生种间杂交可能会导致重新引入作用的失败。为了解决这一问题，我们使用了木薯中华jack（Sinojackia xylocarpa）（一个在野生环境中灭绝的中国特有物种）进行了示范。我们利用亲子关系分析来评估武汉植物园保护种群中木薯与其同源物种S. rehderiana之间的自然杂交和花粉流动模式。在八角参的八株母树中有七种检测到种间杂交事件，并且从八角参的母树收集的平均32.7％的种子是杂种。隶属于雷氏假单胞菌的来自249个木薯的93个父本提供了令人信服的证据，表明自发种间杂交在我们研究的生活花园中广泛发生。在花园内种间和种间杂交事件之间观察到了不同的花粉散布模式（主要是近距离授粉和远距离授粉）。花粉散布在异地种群中不受距离的限制，这证明了平均有效花粉散布距离（δ）与母树和父树之间的地理距离（d1和d2）之间没有显着的相关性。种间花粉分散距离为10到620.1 m（平均294.4 m）。如果将此类杂种用于再引入和恢复，那么这种在异地收集物中的广泛杂交可能会危及濒临灭绝物种的遗传完整性，并不可避免地污染基因库。我们强烈建议采取措施以最小化这种杂交的遗传风险，包括在异地收集物中建立缓冲带，操纵开花物候，在重新引入程序中使用之前测试种子批次以及控制授粉的种子纯度。

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