Geographical parthenogenesis, genome size variation and pollen production in the arctic-alpine species Hieracium alpinum
Hieracium alpinum L. (Asteraceae) is an arctic-alpine species distributed throughout Europe with both diploid and triploid cytotypes. We determined the ploidy levels of plants from 23 populations from Austria, Bosnia and Herzegovina, Finland, Italy, Norway, Romania, Slovakia, Switzerland and Ukraine...
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ftreroch:oai:doc.rero.ch:20091201111014-KA 2023-05-15T14:57:19+02:00 Geographical parthenogenesis, genome size variation and pollen production in the arctic-alpine species Hieracium alpinum Mráz, Patrik Chrtek, Jindřich Šingliarová, Barbora 2009-12-01T10:11:30Z http://doc.rero.ch/record/13116/files/Botanica_Helvetica_2009.pdf eng eng http://doc.rero.ch/record/13116/files/Botanica_Helvetica_2009.pdf 2009 ftreroch 2023-02-16T17:22:49Z Hieracium alpinum L. (Asteraceae) is an arctic-alpine species distributed throughout Europe with both diploid and triploid cytotypes. We determined the ploidy levels of plants from 23 populations from Austria, Bosnia and Herzegovina, Finland, Italy, Norway, Romania, Slovakia, Switzerland and Ukraine. Data showed a non- overlapping pattern of cytotype distribution: sexually reproducing diploids (2n = 2x = 18) occur solely in the Eastern and Southern Carpathians, while apomictic triploids (2n = 3x = 27) cover the rest of the range. Such clear-cut allopatry is rather rare in vascular plants with geographical parthenogenesis. Comparison of absolute genome size indicates genome downsizing (by on average 3.7%) of haploid DNA amount in triploids relative to diploids. Genome size further correlated with longitude and latitude in the Alps, with decreasing absolute DNA content from west to east, and from south to north. While previously published data indicated complete male sterility of triploid plants, we found that plants from the Alps and Bosnia and Herzegovina commonly produced some pollen, whereas populations from the Western Carpathians and Scandinavia seemed to be almost completely pollen sterile. Scenarios about the evolution of geographical parthenogenesis in H. alpinum are discussed. Other/Unknown Material Arctic RERO DOC Digital Library Arctic Norway |
institution |
Open Polar |
collection |
RERO DOC Digital Library |
op_collection_id |
ftreroch |
language |
English |
description |
Hieracium alpinum L. (Asteraceae) is an arctic-alpine species distributed throughout Europe with both diploid and triploid cytotypes. We determined the ploidy levels of plants from 23 populations from Austria, Bosnia and Herzegovina, Finland, Italy, Norway, Romania, Slovakia, Switzerland and Ukraine. Data showed a non- overlapping pattern of cytotype distribution: sexually reproducing diploids (2n = 2x = 18) occur solely in the Eastern and Southern Carpathians, while apomictic triploids (2n = 3x = 27) cover the rest of the range. Such clear-cut allopatry is rather rare in vascular plants with geographical parthenogenesis. Comparison of absolute genome size indicates genome downsizing (by on average 3.7%) of haploid DNA amount in triploids relative to diploids. Genome size further correlated with longitude and latitude in the Alps, with decreasing absolute DNA content from west to east, and from south to north. While previously published data indicated complete male sterility of triploid plants, we found that plants from the Alps and Bosnia and Herzegovina commonly produced some pollen, whereas populations from the Western Carpathians and Scandinavia seemed to be almost completely pollen sterile. Scenarios about the evolution of geographical parthenogenesis in H. alpinum are discussed. |
author |
Mráz, Patrik Chrtek, Jindřich Šingliarová, Barbora |
spellingShingle |
Mráz, Patrik Chrtek, Jindřich Šingliarová, Barbora Geographical parthenogenesis, genome size variation and pollen production in the arctic-alpine species Hieracium alpinum |
author_facet |
Mráz, Patrik Chrtek, Jindřich Šingliarová, Barbora |
author_sort |
Mráz, Patrik |
title |
Geographical parthenogenesis, genome size variation and pollen production in the arctic-alpine species Hieracium alpinum |
title_short |
Geographical parthenogenesis, genome size variation and pollen production in the arctic-alpine species Hieracium alpinum |
title_full |
Geographical parthenogenesis, genome size variation and pollen production in the arctic-alpine species Hieracium alpinum |
title_fullStr |
Geographical parthenogenesis, genome size variation and pollen production in the arctic-alpine species Hieracium alpinum |
title_full_unstemmed |
Geographical parthenogenesis, genome size variation and pollen production in the arctic-alpine species Hieracium alpinum |
title_sort |
geographical parthenogenesis, genome size variation and pollen production in the arctic-alpine species hieracium alpinum |
publishDate |
2009 |
url |
http://doc.rero.ch/record/13116/files/Botanica_Helvetica_2009.pdf |
geographic |
Arctic Norway |
geographic_facet |
Arctic Norway |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
http://doc.rero.ch/record/13116/files/Botanica_Helvetica_2009.pdf |
_version_ |
1766329397430714368 |