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首页> 外文期刊>Mycologia >TAXONOMIC AND PHYLOGENETIC DIVERGENCE AMONG FIVE SCUTELLOSPORA SPECIES BASED ON COMPARATIVE DEVELOPMENTAL SEQUENCES
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TAXONOMIC AND PHYLOGENETIC DIVERGENCE AMONG FIVE SCUTELLOSPORA SPECIES BASED ON COMPARATIVE DEVELOPMENTAL SEQUENCES

机译：基于比较发育序列的五个SC类物种的分类学和植物学发散

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Morphological characters synthesized from differentiation of mycorrhizae and spores were defined developmentally and their stability examined among eight organisms of five Scutellospora species (Glomales, Zygomycetes). Morphology and architecture of fungal hyphae at entry points in Sudan-grass roots were similar to that observed in other Scutellospora species. Surface topology of extraradical auxiliary cell were similar among the taxa studied, and intermediate between that of Gigaspora and other Scutellospora species. Spore differentiation was partitioned into four discrete stages: differentiation of layers in the spore wall (stages 1 and 2), subsequent formation of a bilayered flexible inner wall (stage 3), and lastly, the synthesis of a germination shield (stage 4). Spore growth (expansion) was coupled only with stages 1 and 2. Stages of differentiation could be homologized among taxa because of their division and stability in ontogenesis. Stage 3 was shared by all five Scutellospora species, thus uniting them, together with S. castanea, in a monophyletic group. Species-level divergence in this group was expressed only in properties of spore wall layers. Stages 1-3 were homologous with the first three of five stages in differentiation of S. heterogama spores. These shared stages suggest a pattern of Haecklian recapitulation in the evolution of flexible inner walls and both a historical and a contemporaneous link between all flexible inner walls and germination events. Thus, developmentally defined morphological characters provide a causal linkage between the taxonomic hierarchy and a hierarchy in evolution of spore subcellular structure and also suggest causal relationships between form and function. [References: 30]
机译：通过菌根和孢子的分化合成的形态学特征得到了发展定义，并在五种盾形菌（Glomales，Zygomycetes）的八种生物中检测了它们的稳定性。苏丹草根部入口处的真菌菌丝的形态和结构与其他Scutellospora物种中观察到的相似。在研究的分类单元中，自由基外辅助细胞的表面拓扑相似，并且在长臂猿和其他盾形菌物种之间。孢子的分化被分为四个离散的阶段：孢子壁中各层的分化（阶段1和2），双层柔性内壁的形成（阶段3），最后是发芽盾的合成（阶段4）。孢子的生长（扩展）只与第1和第2阶段有关。由于它们的分裂和在个体发生中的稳定性，分化的阶段可以在类群之间同源。所有5个Scutellospora物种共有3期，因此将它们与S. castanea一起归为一类。该组中物种水平的差异仅在孢子壁层的性质中表达。 1-3阶段与异源沙门氏菌孢子分化的五个阶段中的前三个同源。这些共同的阶段表明了在柔性内壁演变过程中哈克利安重述的模式，以及所有柔性内壁和萌发事件之间的历史和当代联系。因此，发育定义的形态特征提供了分类学层次和孢子亚细胞结构进化层次之间的因果关系，也暗示了形式和功能之间的因果关系。 [参考：30]

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