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Conservatoire botanique national des Pyrénées et de Midi-Pyrénées

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Hybridization and Sexual Reproduction in the Invasive Alien Fallopia (Polygonaceae) Complex in Belgium / Marie-Solange Tiébré in Annals of Botany, 99 (2007) 

Public Citation [article]  inAnnals of Botany > 99 (2007) . - 193-203 Titre : Hybridization and Sexual Reproduction in the Invasive Alien Fallopia (Polygonaceae) Complex in Belgium Type de document : Imprimé Auteurs : Marie-Solange Tiébré ; Sonia Vanderhoeven ; Layla Saad ; Grégory Mahy Année de publication : 2007 Article en page(s) : 193-203 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes Mots-clés : Fallopia aubertii  Fallopia x bohemica  Fallopia japonica (Houtt.) Ronse Decr., 1988  Fallopia sachalinensis (F.Schmidt) Ronse Decr., 1988 Résumé : † Background and Aims The knotweed complex, Fallopia spp. (Polygonaceae), belongs to the most troublesome invasive species in Europe and North America. Vegetative regeneration is widely recognized as the main mode of reproduction in the adventive regions. However, the contribution of sexual reproduction to the success of these invasive species has only been detailed for the British Isles. An examination was made as to how hybridization may influence the sexual reproduction of the complex in Belgium and to determine how it may contribute to the dispersal of the species. † Methods Studies were made of floral biology, reproductive success, seed rain, seed bank, germination capacity, seedling survival and dispersal capacity in order to characterize the reproductive biology of the species. Moreover, chromosome counts and flow cytometry were used to assess the hybrid status of seedlings produced by sexual reproduction. † Key Results In the area investigated, extensive sexual reproduction by hybridization within the complex, including one horticultural species, was demonstrated. A small percentage of seeds may be dispersed outside the maternal clone (.16 m) allowing the formation of genetically differentiated individuals. Seed germination was possible even after a winter cold period. †Conclusions The extensive sexual reproduction by hybridization could further contribute to the dramatic invasive success of knotweeds in Belgium and should not be underestimated when considering control and management measures. Identifiant : DOI : 10.1093/aob/mcl242 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=153130 Tiébré, M.S., Vanderhoeven, S., Saad, L., Mahy, G., 2007 . Hybridization and Sexual Reproduction in the Invasive Alien Fallopia (Polygonaceae) Complex in Belgium. Annals of Botany, 99: 193-203.

Documents numériques

Article (2007) Adobe Acrobat PDF

A comparative study of germination ecology of four Papaver taxa / Laila M. Karlsson in Annals of Botany, 99 (2007) 

Public Citation [article]  inAnnals of Botany > 99 (2007) . - 935-946 Titre : A comparative study of germination ecology of four Papaver taxa Type de document : Numérique Auteurs : Laila M. Karlsson ; Per Milberg Année de publication : 2007 Article en page(s) : 935-946 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Ecologie de la germination Mots-clés : Papaver Résumé : Background and aims: Comparative studies of closely related taxa can increase understanding of adaptations and changes in seed dormancy and germination preferences in an evolutionary perspective. For such studies, a method to describe and compare the performance of taxa in a general way is needed. The germination ecology of four Papaver taxa was studied with the aim of describing and comparing their responses to different seasonal temperature regimes. Methods: Germination of Papaver argemone, P. rhoeas, P. dubium ssp. dubium and P. dubium ssp. lecoqii was investigated in three different artificial climates over 2.5 years. Seeds were collected in southern Sweden, and samples from different populations were used as replicates of taxa. Key results: Despite substantial intra-taxa variation, there were clear taxon-specific responses. Most germination occurred in the warmest climate. In general, the warmer the climate the more germination occurred in autumn instead of spring. Papaver argemone, phylogenetically most distant from the other taxa, was, in contrast to the others, restricted to germinating only at lower temperatures. Conclusions: Seed dormancy and germination may be described by dormancy pattern, germination preferences and dormancy strength. The general dormancy pattern was a common feature for these taxa and therefore probably an evolutionary conservative character. Germination preferences varied between taxa, resulting in different temperature optima and intervals for germination, and dormancy strength was to some extent taxon-specific, but highly variable. The dormancy pattern explained how the taxa can perform as winter annuals in warmer climates, but mainly as summer annuals in colder climates. Hence, there is no need to interpret the within-taxon temporal differences in seedling emergence as local adaptations. In the field, an entire seed cohort will not germinate during a single season. Instead, emergence will be distributed over several seasons, regardless of local climate, weather and soil cultivation methods. Identifiant : DOI : 10.1093/aob/mcm045 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=156275 Karlsson, L.M., Milberg, P., 2007 . A comparative study of germination ecology of four Papaver taxa. Annals of Botany, 99: 935-946.

Documents numériques

Article (2007) Adobe Acrobat PDF