Hybridization and the origin of the arctic grass Poa hartzii (Poaceae): evidence from morphology and chloroplast DNA restriction site data
The hypothesized hybrid origin of Poa hartzii Gand. (Poaceae) was investigated by analysis of morphological and molecular data. This endemic nearctic caespitose grass has been considered to be a hybrid between two of the three sympatric arctic species, Poa glauca M. Vahl, Poa arctica R. Br., and Poa...
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Online Access: | http://dx.doi.org/10.1139/b97-910 http://www.nrcresearchpress.com/doi/pdf/10.1139/b97-910 |
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crcansciencepubl:10.1139/b97-910 2023-12-17T10:24:34+01:00 Hybridization and the origin of the arctic grass Poa hartzii (Poaceae): evidence from morphology and chloroplast DNA restriction site data Gillespie, Lynn J. Consaul, Laurie L. Aiken, Susan G. 1997 http://dx.doi.org/10.1139/b97-910 http://www.nrcresearchpress.com/doi/pdf/10.1139/b97-910 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Botany volume 75, issue 11, page 1978-1997 ISSN 0008-4026 Plant Science journal-article 1997 crcansciencepubl https://doi.org/10.1139/b97-910 2023-11-19T13:38:24Z The hypothesized hybrid origin of Poa hartzii Gand. (Poaceae) was investigated by analysis of morphological and molecular data. This endemic nearctic caespitose grass has been considered to be a hybrid between two of the three sympatric arctic species, Poa glauca M. Vahl, Poa arctica R. Br., and Poa abbreviata R. Br. Field observations and morphological studies indicate that Poa hartzii is a morphologically distinct apomictic species that reproduces and disperses by seed. Restriction enzyme analysis of polymerase chain reaction amplified chloroplast DNA revealed the presence in Poa hartzii of two very different haplotypes. One haplotype is identical to the dominant type found in Poa glauca, while the second is identical to the haplotype of Poa secunda J. Presl., located south of the arctic region. These results are consistent with an hypothesis of ancient hybrid origin involving Poa glauca and Poa secunda, but not Poa arclica nor Poa abbreviata. They are also consistent with an hypothesis of cytoplasmic transfer via hybridization and introgression from Poa glauca to an ancestral Poa hartzii in the Poa secunda complex. Direction of transfer is suggested by the widespread occurrence of the Poa secunda haplotype in Poa hartzii and by closer morphological similarity with Poa secunda than Poa glauca. The origin of Poa hartzii provides an excellent example of reticulate evolution and the importance of hybridization in the speciation of arctic grasses. Key words: Poa hartzii, arctic Poa, chloroplast DNA, restriction enzyme analysis, hybridization, introgression. Article in Journal/Newspaper Arctic Canadian Science Publishing (via Crossref) Arctic Gand ENVELOPE(-62.850,-62.850,-64.400,-64.400) Canadian Journal of Botany 75 11 1978 1997 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Plant Science |
spellingShingle |
Plant Science Gillespie, Lynn J. Consaul, Laurie L. Aiken, Susan G. Hybridization and the origin of the arctic grass Poa hartzii (Poaceae): evidence from morphology and chloroplast DNA restriction site data |
topic_facet |
Plant Science |
description |
The hypothesized hybrid origin of Poa hartzii Gand. (Poaceae) was investigated by analysis of morphological and molecular data. This endemic nearctic caespitose grass has been considered to be a hybrid between two of the three sympatric arctic species, Poa glauca M. Vahl, Poa arctica R. Br., and Poa abbreviata R. Br. Field observations and morphological studies indicate that Poa hartzii is a morphologically distinct apomictic species that reproduces and disperses by seed. Restriction enzyme analysis of polymerase chain reaction amplified chloroplast DNA revealed the presence in Poa hartzii of two very different haplotypes. One haplotype is identical to the dominant type found in Poa glauca, while the second is identical to the haplotype of Poa secunda J. Presl., located south of the arctic region. These results are consistent with an hypothesis of ancient hybrid origin involving Poa glauca and Poa secunda, but not Poa arclica nor Poa abbreviata. They are also consistent with an hypothesis of cytoplasmic transfer via hybridization and introgression from Poa glauca to an ancestral Poa hartzii in the Poa secunda complex. Direction of transfer is suggested by the widespread occurrence of the Poa secunda haplotype in Poa hartzii and by closer morphological similarity with Poa secunda than Poa glauca. The origin of Poa hartzii provides an excellent example of reticulate evolution and the importance of hybridization in the speciation of arctic grasses. Key words: Poa hartzii, arctic Poa, chloroplast DNA, restriction enzyme analysis, hybridization, introgression. |
format |
Article in Journal/Newspaper |
author |
Gillespie, Lynn J. Consaul, Laurie L. Aiken, Susan G. |
author_facet |
Gillespie, Lynn J. Consaul, Laurie L. Aiken, Susan G. |
author_sort |
Gillespie, Lynn J. |
title |
Hybridization and the origin of the arctic grass Poa hartzii (Poaceae): evidence from morphology and chloroplast DNA restriction site data |
title_short |
Hybridization and the origin of the arctic grass Poa hartzii (Poaceae): evidence from morphology and chloroplast DNA restriction site data |
title_full |
Hybridization and the origin of the arctic grass Poa hartzii (Poaceae): evidence from morphology and chloroplast DNA restriction site data |
title_fullStr |
Hybridization and the origin of the arctic grass Poa hartzii (Poaceae): evidence from morphology and chloroplast DNA restriction site data |
title_full_unstemmed |
Hybridization and the origin of the arctic grass Poa hartzii (Poaceae): evidence from morphology and chloroplast DNA restriction site data |
title_sort |
hybridization and the origin of the arctic grass poa hartzii (poaceae): evidence from morphology and chloroplast dna restriction site data |
publisher |
Canadian Science Publishing |
publishDate |
1997 |
url |
http://dx.doi.org/10.1139/b97-910 http://www.nrcresearchpress.com/doi/pdf/10.1139/b97-910 |
long_lat |
ENVELOPE(-62.850,-62.850,-64.400,-64.400) |
geographic |
Arctic Gand |
geographic_facet |
Arctic Gand |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Canadian Journal of Botany volume 75, issue 11, page 1978-1997 ISSN 0008-4026 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/b97-910 |
container_title |
Canadian Journal of Botany |
container_volume |
75 |
container_issue |
11 |
container_start_page |
1978 |
op_container_end_page |
1997 |
_version_ |
1785567768048828416 |