在选定的<i>Hieracium</i>代表不同倍性水平的物种

IF 1.1 4区 生物学 Q3 PLANT SCIENCES Acta Societatis Botanicorum Poloniae Pub Date : 2023-10-20 DOI:10.5586/asbp/172418
Aleksandra Grabowska-Joachimiak, Dagmara Kwolek, Elżbieta Pięta, Zbigniew Szeląg, Andrzej J. Joachimiak
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引用次数: 0

摘要

<i>山属</i>s.str。是几乎强制性的单合子,能够产生非还原性花粉粒,并与有性二倍体种进行属内杂交。最有可能的是,这样的交配系统导致无杂交植物的独立谱系的出现,这些谱系的倍性水平增加,每个谱系都有一套完整的无杂交亲本基因组(最有可能是三倍体)。这些谱系的正确鉴定可以促进等级科的分类和系统发育研究。在本文中,我们分析了所选的6个<i>Hieracium</i>分类群,代表在属中报告的所有倍性水平;alpinum< / i>2 x, & lt; i> H。alpinum< / i>3 x, & lt; i> H。schustleri< / i>4 x, & lt; i> H。chrysostyloides< / i>5 x (& lt; i> H< / i>。节<i>阿尔卑斯</i>)和<i>H。bifidum< / i>3 x, & lt; i> H。levicaule< / i>3 x (& lt; i> H< / i>。教派。& lt; i> Bifida< / i>)。分析的rDNA标记表明,较高倍性水平的两个类群(4x和5x)属于<i>H</i>教派。& lt; i> Alpina< / i>从三倍体遗传了三个基因组。alpinum</i>,其基因组组成为2:1,其中两个基因组来自二倍体<i>alpinum< / i>另一个基因组带有一条来历不明的非典型5S rdna染色体。& lt; i> H。bifidum< / i>和& lt; i> H。levicaule< / i>rDNA分布格局不同,说明<i>H</i>教派。& lt; i> Bifida< / i>可能是一个不太同质的物种群。
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rDNA-FISH pattern in selected <i>Hieracium</i> species representing different ploidy levels
Polyploid species of Hieracium s.str. are near-obligatory apomicts capable of producing non-reduced pollen grains and intrageneric crossing with sexual diploid species. Most probably, such a mating system leads to the emergence of separate lineages of apomictic plants with increased ploidy levels, each of which has a complete set of genomes of its putative (most probably triploid) apomictic parent. The correct identification of such lineages could facilitate taxonomic and phylogenetic research in Hieracium. In this paper, we analyzed the distribution of the 5S and 45S rDNA segments in the karyotypes of six selected Hieracium taxa, representing all ploidy levels reported in the genus: H. alpinum 2x, H. alpinum 3x, H. schustleri 4x, H. chrysostyloides 5x (H. sect. Alpina) and H. bifidum 3x, H. levicaule 3x (H. sect. Bifida). The analyzed rDNA markers suggest that two taxa of the higher ploidy level (4x and 5x) belonging to H. sect. Alpina inherited three genomes from the triploid H. alpinum, which has 2:1 genomic composition with two genomes from diploid H. alpinum and one genome with an untypical 5S rDNA-bearing chromosome of unknown origin. H. bifidum and H. levicaule differ from each other in the rDNA distribution pattern, which suggests that H. sect. Bifida may be a less homogenous group of species.
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来源期刊
CiteScore
2.00
自引率
10.00%
发文量
18
审稿时长
1 months
期刊介绍: The journal has been published since 1923 and offers Open Access publication of original research papers, short communications, and reviews in all areas of plant science, including evolution, ecology, genetics, plant structure and development, physiology and biochemistry.
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