Dépouillements

No evidence for genetic differentiation in juvenile traits between Belgian and French populations of the invasive tree Robinia pseudoacacia / Xavier Bouteiller in Plant Ecology and Evolution, vol. 151, n°1 (Année 2018)

Public [article]  inPlant Ecology and Evolution > vol. 151, n°1 (Année 2018) . - pp. 5-17 Titre : No evidence for genetic differentiation in juvenile traits between Belgian and French populations of the invasive tree Robinia pseudoacacia Type de document : texte imprimé Auteurs : Xavier Bouteiller, Auteur ; Frédéric Barraquand, Auteur ; Pauline Garnier-Géré, Auteur ; Noémie Harmand, Auteur ; Yec'han Laizet, Auteur ; Alexandre Raimbault, Auteur ; Raphaël Segura, Auteur ; Ludivine Lassois, Auteur ; Arnaud Monty, Auteur ; Cindy Verdu, Auteur ; Stéphanie Mariette, Auteur ; Annabel Porté, Auteur Année de publication : 2018 Article en page(s) : pp. 5-17 Langues : Anglais (eng) Mots-clés : plante invasive  local adaptation  qst - fst comparisons  Robinia pseudoacacia  sélection  température Résumé : "Background – The role of evolution in biological invasion studies is often overlooked. In order to evaluate the evolutionary mechanisms behind invasiveness, both quantitative and population genetics studies are underway on Robinia pseudoacacia L., one of the worst invasive tree species in Europe. Methods – A controlled experiment was set up using 2000 seeds from ten populations in Southern France and ten populations in Belgium. Seedlings were cultivated in two climatic chambers set at 18°C and 22°C. Early development life history traits (e.g. seedling phenology) and functional traits (e.g. growth rates) were monitored. Genotyping using SNP markers was used to evaluate the genetic differentiation among the populations and a QST – FST comparison was done in order to test for the role of selection. Results – Populations exhibited a strong plasticity to temperature for all measured traits, the warmer environment being generally more suitable, irrespective of their origin. No significant departure from neutral evolution was evidenced by the QST – FST comparisons, although we found a slightly significant differentiation at the molecular level. Conclusion – Plasticity for the functional and life history traits was evidenced but no genetic interaction suggesting no possible evolution of plasticity at those traits. Moreover, no support for genetic differentiation and local adaptation was found among studied populations within invasive range, raising two main questions: first, what is the role of selection on functional and life-history traits; and second, is the elapsed time since first introduction sufficient to allow evolution and local adaptation?. © 2018 Botanic Garden Meise and Royal Botanical Society of Belgium." Type de publication : périodique Référence biblio : Bouteiller X., Barraquand F., Garnier-Géré P., Harmand N., Laizet Y., Raimbault A., Segura R., Lassois L., Monty A., Verdu C., Mariette S., Porté A., 2018 - No evidence for genetic differentiation in juvenile traits between Belgian and French populations of the invasive tree Robinia pseudoacacia. Plant Ecology and Evolution, 151 (1) : 5-17. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=67621 [article]

Exemplaires(1)

Cote	Localisation	Disponibilité
P0179-2	Brest	Exclu du prêt

Morphophysiological dormancy, germination, and cryopreservation in Aristolochia contorta seeds / Nina Voronkova in Plant Ecology and Evolution, vol. 151, n°1 (Année 2018)

Public [article]  inPlant Ecology and Evolution > vol. 151, n°1 (Année 2018) . - pp. 77-86 Titre : Morphophysiological dormancy, germination, and cryopreservation in Aristolochia contorta seeds Type de document : texte imprimé Auteurs : Nina Voronkova, Auteur ; Alla Kholina, Auteur ; Marina Koldaeva, Auteur ; Olga Nakonechnaya, Auteur ; Vitaly Nechaev, Auteur Année de publication : 2018 Article en page(s) : pp. 77-86 Langues : Anglais (eng) Mots-clés : Aristolochia contorta  embryo development  embryo form  germination  seed cryopreservation  seed dormancy Résumé : "Background and aims – Aristolochia contorta is a valuable medicinal plant, a relict of the Tertiary flora. Little is known about the germination biology of Aristolochia. The specific objectives of the present study were to (1) determine the type of dormancy in seeds of A. contorta, (2) describe the embryo development, and (3) explore the influence of deep freezing of the seeds in liquid nitrogen on their germinability. Methods – Seeds were germinated in Petri dishes in sand previously sterilised at high temperature; germination experiments were carried out at 27±2°C under natural light. All measurements of seeds and embryos were done using light microscopy (LM). For cryopreservation, fresh seeds were placed in aluminium foil bags, immersed into liquid nitrogen (-196°C), and stored for twelve months. Key results – The seeds of Aristolochia contorta have non-deep simple morphophysiological dormancy. A variety of embryo forms were revealed for Aristolochia species for the first time. Two cases of polyembryony were noted in A. contorta. The seeds of A. contorta are resistant to cryopreservation in liquid nitrogen. Conclusions – High variability in dormancy depth and the extended germination period of A. contorta seeds can be considered as adaptive strategies for survival in unfavourable conditions and renewal of germination under optimal conditions. Cryopreservation helped maintain the viability of A. contorta seeds but did not lead to the breaking of the dormancy; hence, for successful germination, it is necessary to use methods of breaking dormancy after freezing." Type de publication : périodique Référence biblio : Voronkova N., Kholina A., Koldaeva M., Nakonechnaya O., Nechaev V., 2018 - Morphophysiological dormancy, germination, and cryopreservation in Aristolochia contorta seeds. Plant Ecology and Evolution, 151 (1) : 77-86. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=67627 [article]

Exemplaires(1)

Cote	Localisation	Disponibilité
P0179-2	Brest	Exclu du prêt