rDNA-FISH pattern in selected Hieracium 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,...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Polish Botanical Society
2023-10-01
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| Series: | Acta Societatis Botanicorum Poloniae |
| Subjects: | |
| Online Access: | https://www.journalssystem.com/asbp/rDNA-FISH-pattern-in-selected-Hieracium-species-representing-different-ploidy-levels,172418,0,2.html |
| Summary: | 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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| ISSN: | 0001-6977 2083-9480 |