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首页> 外文期刊>Marine biology >Polymorphism in the brown alga Dictyota dichotoma (Dictyotales, Phaeophyceae) from Korea
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Polymorphism in the brown alga Dictyota dichotoma (Dictyotales, Phaeophyceae) from Korea

机译：来自韩国的褐藻Dictyota dichotoma（Dictyotales，Phaeophyceae）的多态性

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Two morphotypes of Dictyota dichotoma of uncertain taxonomic status have been identified in Korea. The broad thallus type is common on the south and east coasts of Korea, and is similar to European D. dichotoma in gross morphology. The slender thallus type is only found on the west coast. Morphological differences between the two plant types are evident in their thallus width, their terminal bifurcations, the shapes of apices, and their thallus thickness. The differences in the size and shape of the tetrasporangia and tetraspores are also notable. Plants from the east coast exhibit a dominant asexual annual life-cycle involving sporophytes but not gametophytes, and maintain their population by the production of in-situ germlings. In the slender plants from the west coast, a sexual life-cycle dominates. The rbcL, rbcS, psaA and psbA gene sequence differences between the two morphotypes were congruent with morphological, anatomical and phenological characteristics. In spite of these differences, there is no known inbreeding barrier between these two morphotypes. The L-m/L-c values of the second internodes from two types are also within the range of the species criterion specified by Hornig et al. These results suggest that the two types of D. dichotoma from Korea should be classified as a single species and that they may be in the process of speciation due to geographical isolation (allopatric speciation).
机译：在韩国，已经确定了分类状态不确定的双歧双歧杆菌的两种形态。广泛的丘疹类型在韩国的南海岸和东海岸很常见，在总体形态上类似于欧洲的D. dichotoma。细长的丘疹类型仅在西海岸发现。两种植物类型之间的形态学差异在它们的all体宽度，末端分叉，顶点形状和all体厚度上很明显。四孢子囊和四孢子在大小和形状上的差异也很明显。来自东海岸的植物表现出占主导地位的无性年度生命周期，涉及孢子体而不是配子体，并通过就地种苗的生产维持其种群。在西海岸的苗条植物中，性生活周期占主导地位。两种形态型之间的rbcL，rbcS，psaA和psbA基因序列差异在形态，解剖学和物候学特征上是一致的。尽管存在这些差异，但在这两种形态型之间没有已知的近交障碍。来自两种类型的第二节间的L-m / L-c值也在Hornig等人指定的物种标准的范围内。这些结果表明，来自韩国的两种D. dichotoma应归为单一物种，由于地理隔离（异种物种形成），它们可能正在形成物种。

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