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首页> 外文期刊>African Journal of Biotechnology >Karyomorphotypic variation in Eriospermum abyssinicum Baker
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Karyomorphotypic variation in Eriospermum abyssinicum Baker

机译：赤豆面包的核型变异。

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摘要

The karyomorphology of the cotton seed lily,?Eriospermum abyssinicum?Baker (family Eriospermaceae)?was investigated through mitotic and meiotic studies. The chromosome complement was karyotypically analysed based on chromosome arm ratio and centromeric indices. The somatic chromosome complement of 2n = 24 recorded at metaphase I and the 12 bivalents at prophase I of meiosis suggested x = 6 basic chromosome number and paleopolyploidization process in the evolution of this species. There was no evidence of B chromosome or nucleolar-organizer in the complements. Variation in position of centromere ranged from the median to sub-median and sub-terminal. We found slight variation between some homologues in terms of lengths which suggest hybrid origin (allopolyploidy) of the genome. The microspore mother cell had normal meiosis with subsequent formation of 4 daughter nuclei and normal spores suggesting that the changes in chromosome behaviour occurred at very low frequency and these changes were transient with no evidence of phenotypic and genomic instability (aneuploidy) consequences. It was therefore inferred that the population of?E. abyssinicum?studied might have evolved through changes in chromosome structure or through natural hybridisation between closely related populations.
机译：通过有丝分裂和减数分裂研究，研究了棉籽百合的核型学，即“ Eriospermum abyssinicum？Baker”（“ Eeriospermaceae”科）。基于染色体臂比和着丝粒指数对染色体补体进行核型分析。在减数分裂的中期I记录的体染色体互补为2n = 24，在减数分裂前期I的记录为12个二价体，提示该物种进化过程中x = 6个基本染色体数和古多倍体化过程。补体中没有B染色体或核仁组织者的迹象。着丝粒位置的变化范围从中位数到次中位数和次末端。我们发现一些同源物之间的长度略有差异，这表明基因组的杂种起源（多倍体）。小孢子母细胞具有正常的减数分裂作用，随后形成4个子核和正常的孢子，这表明染色体行为的改变以非常低的频率发生，并且这些改变是短暂的，没有证据表明表型和基因组不稳定（非整倍性）。因此，推断出E人口。研究的bysssinicum？可能是通过染色体结构的变化或密切相关的种群之间的自然杂交而进化的。

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