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首页> 外文期刊>Genetic Resources and Crop Evolution >Karyotype characterization reveals an up and down of 45S and 5S rDNA sites in Crotalaria (Leguminosae-Papilionoideae) species of the section Hedriocarpae subsection Macrostachyae
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Karyotype characterization reveals an up and down of 45S and 5S rDNA sites in Crotalaria (Leguminosae-Papilionoideae) species of the section Hedriocarpae subsection Macrostachyae

机译：核型鉴定表明在杂果类科Macrostachyae的猪屎豆科（Leguminosae-Papilionoideae）物种中有一个向上和向下的45S和5S rDNA位点。

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摘要

The genus Crotalaria is one of the largest within the family Leguminosae-Papilionoideae, with more than 600 species. However, few karyotypes have been described. In the present paper, five species belonging to the section Hedriocarpae were studied (subsection Machrostachyae), in order to better understand chromosomal evolution in Crotalaria. The results reveals that all species presented 2n = 2x = 16 with symmetrical karyotypes, and slight differences in the chromosome morphology. A secondary constriction was identified at short arm of the pair 1. The 45S rDNA was mapped in the secondary constriction and adjacent heterochromatin (NOR-heterochromatin) and a minor site was identified in C. ochroleuca. The 5S rDNA was mapped linked to 45S rDNA at chromosome 1 short arm in all species. Additional sites for 5S rDNA were identified in C. pallida, C. striata and C. mucronata. Heterochromatin blocks around the centromeres are not CMA(+) neither DAPI(+). The karyotypes of the subsection Macrostachyae are characterized by an inversion at chromosome pair one in relation to previous specialized floral species analyzed. Additional sites of 45S and 5S rDNA were assumed to be a result of transposition events by different ways. The results suggest heterochromatin differentiation and the position of ribosomal genes indicates chromosomal rearrangements during evolution. Karyotype characteristics corroborate the morphological infrageneric classification.
机译：猪屎豆属是豆科-凤蝶科中最大的属之一，有600多种。但是，很少描述核型。在本文中，为了更好地了解猪屎豆属的染色体进化，研究了属于果皮科的五个物种（Machrostachyae子科）。结果表明，所有物种都呈现出2n = 2x = 16的对称核型，并且染色体形态略有不同。在一对1的短臂处发现了次级颈缩。将45S rDNA定位在次级颈缩和邻近的异染色质（NOR-heterochromatin）中，并在Ch.ochroleuca中鉴定了一个次要位点。在所有物种中，将5S rDNA与45S rDNA连锁位于1号染色体短臂上。 5S rDNA的其他位点被确认为在C. pallida，C。striata和C. mucronata中。着丝粒周围的异染色质阻滞既不是CMA（+）也不是DAPI（+）。 Macrostachyae小节的核型的特征是，在第一个染色体对上与先前分析的特殊花种有关。假定另外的45S和5S rDNA位点是通过不同方式发生的转座事件的结果。结果表明异染色质分化和核糖体基因的位置表明进化过程中染色体重排。核型特征证实了形态上的次基因分类。

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