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首页> 外文期刊>South African Journal of Botany >Natural hybridization in the orchid flora of South Africa: Comparisons among genera and floristic regions
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Natural hybridization in the orchid flora of South Africa: Comparisons among genera and floristic regions

机译：南非兰花植物群的自然杂交：属于植物区的比较

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Natural hybridization is an important evolutionary process that can act as a bridge for gene flow between species, generate new variation, and even precipitate formation of new species. Orchids are an ideal plant group for assessing the incidence of natural hybridization as they are well-studied and form hybrids that are relatively easy to identify using floral traits. Here I provide an illustrated compendium of the putative natural orchid hybrids recorded in South Africa and ask whether natural hybridization is concentrated in particular lineages or floristic regions. There are 0.082 reported natural hybrids for every orchid species in South Africa, which is similar to the value of 0.09 reported for angiosperms in general. The largest number of putative natural hybrids is found in Disa (17 hybrid combinations involving 25 species) and Satyrium (11 hybrid combinations involving 13 species). The weighted average hybridization propensity (percentage of possible hybrid combinations realized) for South African orchids is estimated to be 0.92%, which is much lower than the value of 6% reported for orchids in seven other mainly temperate northern hemisphere floras. Natural hybridization appears to be more frequent in the Cape Floristic Region (documented for 15% of orchid species) than in the rest of South Africa (documented for 8% of orchid species). The factors that govern variation in the frequency of natural hybridization among orchid species are still largely unknown and require further investigation. (c) 2018 SAAB. Published by Elsevier B.V. All rights reserved.
机译：自然杂交是一种重要的进化过程，可以作为物种之间的基因流动的桥梁，产生新的变异，甚至沉淀地形成新物种。兰花是一种理想的植物组，用于评估自然杂交的发生率，因为它们是良好的研究，并且形成使用花卉特征相对容易识别的杂种。在此，我提供了在南非记录的推定天然兰花杂交种的说明纲要，并询问自然杂交是否浓缩特定的素描或植物区。南非每种兰花种类报告了0.082次自然杂交种，其与一般的Anviosperms报告的值类似。在DIS（涉及25种）和苏里亚姆（涉及13种的11种杂交组合）的DIS（17种杂种组合）中发现了最多的推定天然杂交种。南非兰花的加权平均杂交倾向（实现的可能的混合组合的百分比）估计为0.92％，远低于七个主要温带北半球群体兰花报告的6％的值。植物区植物区（兰花物种的15％）似乎比在南非的其他地区（记录了8％的兰花物种），自然杂交似乎更频繁。控制兰花物种自然杂交频率变异的因素仍然很大程度上是未知的并且需要进一步调查。 （c）2018 Saab。 elsevier b.v出版。保留所有权利。

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