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Inter- and intra- variability of seed germination traits of Carpobrotus edulis N.E.Br. and its hybrid C. affine acinaciformis L. / Lina Podda in Plant biology, vol. 20, n°6 (Année 2018)

Public [article]  inPlant biology > vol. 20, n°6 (Année 2018) . - pp. 1059-1067 Titre : Inter- and intra- variability of seed germination traits of Carpobrotus edulis N.E.Br. and its hybrid C. affine acinaciformis L. Type de document : texte imprimé Auteurs : Lina Podda, Auteur ; Andrea Santo, Auteur ; Efisio Mattana, Auteur ; Olga Mayoral, Auteur ; Gianluigi Bacchetta, Auteur Année de publication : 2018 Article en page(s) : pp. 1059-1067 Langues : Anglais (eng) Catégories : [habitats/milieux] 1 - Habitats littoraux et halophile [Espèces (in biblio)] Carpobrotus [Espèces (in biblio)] Carpobrotus edulis [Thèmes] Flore vasculaire (phanérogames et cryptogames vasculaires) [Thèmes] Germination des graines Mots-clés : écosystème  NaCl  plante invasive  hybride Résumé : "Invasions by alien Carpobrotus spp. have been recognized as one of the most severe threats to Mediterranean‐climate coastal ecosystems and Carpobrotus is considered one of the most widespread invasive alien genera in the Mediterranean Basin. The aims of this study were to characterize seed germination of both C. edulis and its hybrid C. affine acinaciformis, in terms of photoperiod, temperature and salinity. Inter‐ and intra‐specific variability in the responses to photoperiod (12/12 h light and total darkness), constant temperatures (5, 10, 15, 20, 25°C) and an alternating temperature regime (25/10°C), salt stress (0, 125, 250, 500 mM NaCl) and the recovery of seed germination were evaluated for two seed lots of C. edulis and two of its hybrid C. affine acinaciformis. All the tested seed lots achieved higher germination percentages in the light, respect to total darkness. In relation to temperature, the two C. edulis seed lots did not show a preference, while the two C. affine acinaciformis seed lots differed in their germination response, one germinating more at the lowest temperatures (5 and 10°C) and one at the highest (20 and 25°C). For all the seed lots, highest germination occurred without NaCl (0 mM) and germination decreased with increasing salinity. Different germination requirements in saline substrate were not detected for C. edulis, while were observed for C. affine acinaciformis. Marked differences were detected in recovery responses between the two taxa. C. edulis demonstrated to have the ability to germinate in a wide time window during the year. This study identified significant differences in seed production, seed mass, germination requirements (temperature) and salinity tolerance for both C. edulis and C. affine acinaciformis. Our results indicated the extreme versatility of the hybrid forms to germinate in a wide range of natural conditions and habitats." (source : auteurs) Type de publication : périodique Référence biblio : Podda L., Santo A., Mattana E., Mayoral O., Bacchetta G., 2018 - Inter- and intra- variability of seed germination traits of Carpobrotus edulis N.E.Br. and its hybrid C. affine acinaciformis L. Plant biology, 20 (6) : 1059-1067. ID PMB : 69836 DOI : 10.1111/plb.12867 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=69836 [article]

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