What do chloroplast sequences tell us about the identity of the commonly named Guineagrass, an invasive Poaceae in the southern United States?
The commonly named Guinea grass of the Poaceace family is a native African grass that has been extensively and successfully introduced as a source of animal fodder to other tropical areas of both hemispheres. On a global scale but particularly in the southern United States, the Caribbean and Hawaii, it is becoming a serious threat to biodiversity not only due to its invasiveness but also because it produces high fuel loads for fires. For the first time, a biological control program is being attempted in Texas. Source populations of the Texan invasion have to be identified in the native range in order to facilitate the search for potential biological control agents. This raises the critical issue of a proper taxonomic identification for this taxon with a history of taxonomic revisions, multiple scenarios of massive introductions and hybridization and polyploidisation events. Guinea grass in the strict sense should refer to Megathyrsus maximus (Jacq.), also known as Panicum maximum and Urochloa maxima. To unravel the taxonomic identification and the evolutionary history of this controversial taxon, we have begun to analyze sequences of two chloroplast regions in modern African and Texan samples as well as historical specimens in the CIRAD collection, some dating back to 1944, prior all extensive improvement programs in Africa. None of the sequences matched the sequence of a voucher specimen of Megathyrsus maximus (Jacq.). Results provided evidence of two different maternal lineages, one distributed from eastern Africa to southeastern Africa and Texas that fully matched the sequence of a voucher specimen of Megathyrsus infestus (Andersson) and one distributed across western/central Africa and French Guiana that do not belong to Megathyrsus genus. Future programs of exploration and collection of natural enemies are to be reviewed in light of these findings.
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dig-cirad-fr-5613172019-09-04T12:07:48Z http://agritrop.cirad.fr/561317/ http://agritrop.cirad.fr/561317/ What do chloroplast sequences tell us about the identity of the commonly named Guineagrass, an invasive Poaceae in the southern United States? Bon Marie-Claude, Goolsby John, Mercadier Guy, Le Bourgeois Thomas, Poilecot Pierre, Jeanneau Mélanie, Kirk Alan A.. 2011. In : Proceedings of the XIII International Symposium on Biological Control of Weeds, September 11- 16, 2011, Waikoloa, USA. Wu Yun (ed.), Johnson Tracy (ed.), Sing Sharlene (ed.), Raghu S. (ed.), Wheeler Greg (ed.), Pratt Paul (ed.), Warner Keith (ed.), Center Ted (ed.), Goolsby John (ed.), Reardon Richard (ed.). Hawaii : FHTET, 322. International Symposium on Biological Control of Weeds. 13, Hawaï, États-Unis, 11 Septembre 2011/16 Septembre 2011.https://www.invasive.org/publications/xiiisymposium/Session-7.pdf <https://www.invasive.org/publications/xiiisymposium/Session-7.pdf> Researchers What do chloroplast sequences tell us about the identity of the commonly named Guineagrass, an invasive Poaceae in the southern United States? Bon, Marie-Claude Goolsby, John Mercadier, Guy Le Bourgeois, Thomas Poilecot, Pierre Jeanneau, Mélanie Kirk, Alan A. eng 2011 FHTET Proceedings of the XIII International Symposium on Biological Control of Weeds, September 11- 16, 2011, Waikoloa, USA H60 - Mauvaises herbes et désherbage F70 - Taxonomie végétale et phytogéographie F30 - Génétique et amélioration des plantes The commonly named Guinea grass of the Poaceace family is a native African grass that has been extensively and successfully introduced as a source of animal fodder to other tropical areas of both hemispheres. On a global scale but particularly in the southern United States, the Caribbean and Hawaii, it is becoming a serious threat to biodiversity not only due to its invasiveness but also because it produces high fuel loads for fires. For the first time, a biological control program is being attempted in Texas. Source populations of the Texan invasion have to be identified in the native range in order to facilitate the search for potential biological control agents. This raises the critical issue of a proper taxonomic identification for this taxon with a history of taxonomic revisions, multiple scenarios of massive introductions and hybridization and polyploidisation events. Guinea grass in the strict sense should refer to Megathyrsus maximus (Jacq.), also known as Panicum maximum and Urochloa maxima. To unravel the taxonomic identification and the evolutionary history of this controversial taxon, we have begun to analyze sequences of two chloroplast regions in modern African and Texan samples as well as historical specimens in the CIRAD collection, some dating back to 1944, prior all extensive improvement programs in Africa. None of the sequences matched the sequence of a voucher specimen of Megathyrsus maximus (Jacq.). Results provided evidence of two different maternal lineages, one distributed from eastern Africa to southeastern Africa and Texas that fully matched the sequence of a voucher specimen of Megathyrsus infestus (Andersson) and one distributed across western/central Africa and French Guiana that do not belong to Megathyrsus genus. Future programs of exploration and collection of natural enemies are to be reviewed in light of these findings. conference_item info:eu-repo/semantics/conferenceObject Conference info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/561317/1/document_561317.pdf application/pdf Cirad license info:eu-repo/semantics/openAccess https://agritrop.cirad.fr/mention_legale.html https://www.invasive.org/publications/xiiisymposium/Session-7.pdf info:eu-repo/semantics/altIdentifier/purl/https://www.invasive.org/publications/xiiisymposium/Session-7.pdf |
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H60 - Mauvaises herbes et désherbage F70 - Taxonomie végétale et phytogéographie F30 - Génétique et amélioration des plantes H60 - Mauvaises herbes et désherbage F70 - Taxonomie végétale et phytogéographie F30 - Génétique et amélioration des plantes |
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H60 - Mauvaises herbes et désherbage F70 - Taxonomie végétale et phytogéographie F30 - Génétique et amélioration des plantes H60 - Mauvaises herbes et désherbage F70 - Taxonomie végétale et phytogéographie F30 - Génétique et amélioration des plantes Bon, Marie-Claude Goolsby, John Mercadier, Guy Le Bourgeois, Thomas Poilecot, Pierre Jeanneau, Mélanie Kirk, Alan A. What do chloroplast sequences tell us about the identity of the commonly named Guineagrass, an invasive Poaceae in the southern United States? |
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The commonly named Guinea grass of the Poaceace family is a native African grass that has been extensively and successfully introduced as a source of animal fodder to other tropical areas of both hemispheres. On a global scale but particularly in the southern United States, the Caribbean and Hawaii, it is becoming a serious threat to biodiversity not only due to its invasiveness but also because it produces high fuel loads for fires. For the first time, a biological control program is being attempted in Texas. Source populations of the Texan invasion have to be identified in the native range in order to facilitate the search for potential biological control agents. This raises the critical issue of a proper taxonomic identification for this taxon with a history of taxonomic revisions, multiple scenarios of massive introductions and hybridization and polyploidisation events. Guinea grass in the strict sense should refer to Megathyrsus maximus (Jacq.), also known as Panicum maximum and Urochloa maxima. To unravel the taxonomic identification and the evolutionary history of this controversial taxon, we have begun to analyze sequences of two chloroplast regions in modern African and Texan samples as well as historical specimens in the CIRAD collection, some dating back to 1944, prior all extensive improvement programs in Africa. None of the sequences matched the sequence of a voucher specimen of Megathyrsus maximus (Jacq.). Results provided evidence of two different maternal lineages, one distributed from eastern Africa to southeastern Africa and Texas that fully matched the sequence of a voucher specimen of Megathyrsus infestus (Andersson) and one distributed across western/central Africa and French Guiana that do not belong to Megathyrsus genus. Future programs of exploration and collection of natural enemies are to be reviewed in light of these findings. |
format |
conference_item |
topic_facet |
H60 - Mauvaises herbes et désherbage F70 - Taxonomie végétale et phytogéographie F30 - Génétique et amélioration des plantes |
author |
Bon, Marie-Claude Goolsby, John Mercadier, Guy Le Bourgeois, Thomas Poilecot, Pierre Jeanneau, Mélanie Kirk, Alan A. |
author_facet |
Bon, Marie-Claude Goolsby, John Mercadier, Guy Le Bourgeois, Thomas Poilecot, Pierre Jeanneau, Mélanie Kirk, Alan A. |
author_sort |
Bon, Marie-Claude |
title |
What do chloroplast sequences tell us about the identity of the commonly named Guineagrass, an invasive Poaceae in the southern United States? |
title_short |
What do chloroplast sequences tell us about the identity of the commonly named Guineagrass, an invasive Poaceae in the southern United States? |
title_full |
What do chloroplast sequences tell us about the identity of the commonly named Guineagrass, an invasive Poaceae in the southern United States? |
title_fullStr |
What do chloroplast sequences tell us about the identity of the commonly named Guineagrass, an invasive Poaceae in the southern United States? |
title_full_unstemmed |
What do chloroplast sequences tell us about the identity of the commonly named Guineagrass, an invasive Poaceae in the southern United States? |
title_sort |
what do chloroplast sequences tell us about the identity of the commonly named guineagrass, an invasive poaceae in the southern united states? |
publisher |
FHTET |
url |
http://agritrop.cirad.fr/561317/ http://agritrop.cirad.fr/561317/1/document_561317.pdf |
work_keys_str_mv |
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