The Schedonorus-Lolium complex of the subtribe Loliinae (Poaceae) includes several economically important forage and turf grasses. This complex encompasses Lolium Linnaeus, 1753, Festuca Linnaeus, 1753 subgenus Schedonorus (P. Beauvois, 1824) Petermann, 1849 and Micropyropsis Romero Zarco et Cabezudo, 1983. New FISH results of 5S and 18S–26S rDNA sequences are presented for three species and the results are interpreted in a review of distribution patterns of 5S and 18S–26S rDNA sequences among other species in the complex. Micropyropsis tuberosa Romero Zarco et Cabezudo, 1983 (2n = 2x = 14) displayed a distribution pattern of rDNA sequences identical to that of F. pratensis Hudson, 1762, supporting a close phylogenetic relationship at the bottom of the phylogenetic tree. “Lolium multiflorum” Lamarck, 1779 accessions sourced from Morocco showed a different pattern from European L. multiflorum and could be a unique and previously uncharacterised taxon. North African Festuca simensis Hochstetter ex A. Richard, 1851 had a marker pattern consistent with allotetraploidy and uniparental loss of one 18S–26S rDNA locus. This allotetraploid has previously been suggested to have originated from a hybrid with Festuca glaucescens (Festuca arundinacea var. glaucescens Boissier, 1844). However, the distribution patterns of the two rDNA sequences in this allotetraploid do not align with F. glaucescens, suggesting that its origin from this species is unlikely. Furthermore, comparisons with other higher alloploids in the complex indicate that F. simensis was a potential donor of two sub-genomes of allohexaploid Festuca gigantea (Linnaeus) Villars, 1787. In the overall complex, the proximal locations of both rDNA markers were conserved among the diploid species. Two types of synteny of the two markers could, to a considerable extent, distinguish allo- and autogamous Lolium species. The ancestral parentage of the three Festuca allotetraploids has not yet been determined, but all three appear to have been sub-genome donors to the higher allopolypoids of sub-genus Schedonorus. Terminal locations of both the markers were absent from the diploids but were very frequently observed in the polyploids.

中文翻译：

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Schedonorus-Lolium复合体（禾本科）中rDNA位点的分布模式

 Loliinae（禾本科）亚族的 Schedonorus-Lolium 复合体包括几种经济上重要的牧草和草坪草。该复合体包括 Lolium Linnaeus, 1753, Festuca Linnaeus, 1753 Schedonorus 亚属 (P. Beauvois, 1824) Petermann, 1849 和 Micropyropsis Romero Zarco et Cabezudo, 1983。针对三个物种和对复合体中其他物种中 5S 和 18S-26S rDNA 序列分布模式的回顾解释了这些结果。Micropyropsis tuberosa Romero Zarco et Cabezudo, 1983 (2n = 2x = 14) 显示了与 F. pratensis Hudson, 1762 相同的 rDNA 序列分布模式，支持系统发育树底部的密切系统发育关系。“黑麦草”拉马克，来自摩洛哥的 1779 年种质显示出与欧洲多花 L. multiflorum 不同的模式，并且可能是一个独特且以前未表征的分类单元。北非 Festuca simensis Hochstetter ex A. Richard, 1851 的标记模式与异源四倍体和一个 18S-26S rDNA 基因座的单亲缺失一致。这种异源四倍体以前被认为起源于与 Festuca glaucescens 的杂种（Festuca arundinacea var. glaucescens Boissier，1844）。然而，该异源四倍体中两个 rDNA 序列的分布模式与 F. glaucescens 不一致，这表明其起源于该物种的可能性不大。此外，与复合体中其他更高的异倍体的比较表明，苦瓜是异源六倍体巨羊茅 (Linnaeus) Villars, 1787 的两个亚基因组的潜在供体。在整个复合体中，两个 rDNA 标记的近端位置在二倍体物种中是保守的。两种标记的两种类型的同线性可以在很大程度上区分同种异体和自体黑麦草物种。三个羊茅异源四倍体的祖先血统尚未确定，但所有三个似乎都是 Schedonorus 亚属的高级异源多体的亚基因组供体。二倍体中不存在两个标记的末端位置，但在多倍体中非常频繁地观察到。三个羊茅异源四倍体的祖先血统尚未确定，但所有三个似乎都是 Schedonorus 亚属的高级异源多体的亚基因组供体。二倍体中不存在两个标记的末端位置，但在多倍体中非常频繁地观察到。三个羊茅异源四倍体的祖先血统尚未确定，但所有三个似乎都是 Schedonorus 亚属的高级异源多体的亚基因组供体。二倍体中不存在两个标记的末端位置，但在多倍体中非常频繁地观察到。