Catégories
Documents disponibles dans cette catégorie (16)



Titre : Biogéographie de la graine de "Petrocoptis" Type de document : Tiré à part de revue Auteurs : Pedro Montserrat Recoder (1918-2017) Année de publication : 1977 Importance : 523-527 Langues : Français (fre) Catégories : [Thématique] Graines Mots-clés : Petrocoptis Lien pérenne : Handle : 10261/73206 / DOI : 10.1080/00837792.1979.10670193
Montserrat Recoder, P. 1977. Biogéographie de la graine de "Petrocoptis". Webbia, 34(1) : 523-527.Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 1928 Montserrat-Recoder P. Tiré à part Centre de documentation Tirés à part Consultable Documents numériques
Consultable
Article (1977)URLDormancy breaking and germination of Enterolobium contortisiliquum (Vell.) Morong seed / Marlene de Matos Malavasi (2004)
![]()
Titre : Dormancy breaking and germination of Enterolobium contortisiliquum (Vell.) Morong seed Type de document : Tiré à part de revue Auteurs : Marlene de Matos Malavasi ; Marlene de Matos Malavasi ; Ubirajara Contro Malavasi Année de publication : 2004 Importance : 1 p. Langues : Anglais (eng) Catégories : [Thématique] Graines
[Thématique] Physiologie de la germinationRésumé : Enterolobium contortisiliquum (Vell.) Morong. is a Mimosaceae tropical tree species recommended for heterogeneous reforestation of degraded tropical areas. "Timburi" seeds present low germination due to the high degree of seed dormancy. Different methods to overcome seed dormancy was compared: sanding, sanding followed by 24 hours water (25ºC) soaking, imbibition in boiling water followed by exposure to water at room temperature (28ºC), and concentrated sulfuric acid (5, 15, 30, 60, 120 or 180 minutes) followed by washing with tap water. All seeds were germinated in rolled towels at 25ºC and 12 hours photoperiod. Total germination, first count of germination test and germination velocity index were recorded. Mechanical scarification (sanding), chemical scarification (treatment with acid for 30, 60, 120 or 180 minutes) and mechanical scarification followed by cold water imbibition were efficient in promoting germination. For practical purposes, mechanical scarification is highly recommended for forest nurseries. Lien pérenne : DOI : 10.1590/S1516-89132004000600003 Malavasi, M.d.M., Malavasi, M.d.M., Malavasi, U.C. 2004. Dormancy breaking and germination of Enterolobium contortisiliquum (Vell.) Morong seed. Brazilian Archives of Biology and Technology, 47(6) : 1 p..Documents numériques
Consultable
Article (2004)URLEvolution during seed production for ecological restoration ? / Malte Conrady in Journal of applied ecology, 59 (5) (May 2022)
![]()
[article]
Titre : Evolution during seed production for ecological restoration ? : A molecular analysis of 19 species finds only minor genomic changes Type de document : Électronique Auteurs : Malte Conrady ; Christian Lampei ; Oliver Bossdorf ; Walter Durka ; Anna Bucharova Année de publication : 2022 Article en page(s) : 1-11 Catégories : [Thématique] Graines
[Thématique] Restauration des écosystèmes
[Thématique] Revégétalisation
[Thématique] Diversité génétiqueRésumé : A growing number of restoration projects require large amounts of seeds. As harvesting natural populations cannot cover the demand, wild plants are often propagated in large-scale monocultures. There are concerns that this cultivation process may cause genetic drift and unintended selection, altering the genetic properties of the cultivated populations and reducing their genetic diversity. Such changes could reduce the pre-existing adaptation of restored populations and limit their adaptability to environmental change. We used single nucleotide polymorphism (SNP) markers and a pool-sequencing approach to test for genetic differentiation and changes in gene diversity during cultivation in 19 wild grassland species, comparing source populations and up to four consecutive cultivation generations. We linked the magnitudes of genetic changes to the species' breeding systems and seed dormancy to understand the roles of these traits in genetic change. Cultivation changed the genetic composition across cultivated generations only moderately. The genetic differentiation resulting from cultivation was much lower than the natural genetic differentiation between different source regions. The propagated generations harboured even higher gene diversity than wild-collected seeds. Genetic change was stronger in self-compatible than self-incompatible species, probably due to increased outcrossing in monocultures. Synthesis and applications. Our study suggests that large-scale seed production maintains the genetic integrity of natural populations. Increased genetic diversity may even indicate increased adaptive potential of propagated seeds, which would make them especially suitable for ecological restoration. Yet, it remains to be tested whether these molecular patterns will be mirrored also by plant phenotypes. Further, we used seeds from Germany and Austria, where the seed production is regulated and certified, and we do not know yet whether other seed production systems perform equally well.
Lien pérenne : DOI : 10.1111/1365-2664.14155
in Journal of applied ecology > 59 (5) (May 2022) . - 1-11Conrady, M., Lampei, C., Bossdorf, O., Durka, W., Bucharova, A. 2022. Evolution during seed production for ecological restoration ? : A molecular analysis of 19 species finds only minor genomic changes. Journal of applied ecology, 59(5): 1-11.Documents numériques
Consultable
Article (2022)URLLes graines : de grandes voyageuses / Anne Möller
Titre : Les graines : de grandes voyageuses Type de document : Imprimé Auteurs : Anne Möller Editeur : Nantes : Gulf Stream Importance : 36 p. ISBN/ISSN/EAN : 978-2-909421-53-7 Langues : Français (fre) Catégories : [Thématique] Graines
[Thématique] Coadaptation, coévolution, symbiose (dissémination, pollinisation)
[Thématique] Régime et stratégie de reproduction (allogamie, autogamie, apomixie, reproduction asexué)Möller, A. . Les graines : de grandes voyageuses. Gulf Stream, Nantes. 36 pp.Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 18710 4410 Livre Centre de documentation Bibliothèque Consultable Increasing spring temperatures favor oak seed production in temperate areas / Thomas Caignard in Scientific reports, (17 August 2017)
![]()
[article]
Titre : Increasing spring temperatures favor oak seed production in temperate areas Type de document : Électronique Auteurs : Thomas Caignard ; Antoine Kremer (1951-) ; Cyril Firmat ; Manuel Nicolas ; Samuel Venner ; Sylvain Delzon (1977-) Année de publication : 2017 Article en page(s) : 1-8 Langues : Anglais (eng) Catégories : [Thématique] Global change, écosystème, évolution
[Thématique] Graines
[Thématique] Reproduction végétative
[Thématique] Système de reproductionMots-clés : Quercus L., 1753 Résumé : The changes in reproductive phenology (i.e. timing of flowering and fruiting) observed in recent decades demonstrate that tree reproduction has already been altered by climate change. However, understanding the impact of these changes in reproductive success and fitness remains a major challenge for ecologists. We describe here a previously unreported phenomenon: a significant increase in the reproductive effort (seed production) of temperate oaks with increasing spring temperature, observed over the last decade. In contrast, no relationship was found between seed production and precipitation. This sensitivity of seed production to temperature was confirmed by a “space-for-time” substitution based on elevation gradients. Our findings suggest that global warming may enhance oak reproductive effort in temperate ecosystems. Nevertheless, while fitness can be enhanced by higher levels of seed production, it also depends on the frequency and synchronization of mast seeding production, which may also be influenced by climate change. Lien pérenne : DOI : 10.1038/s41598-017-09172-7
in Scientific reports > (17 August 2017) . - 1-8Caignard, T., Kremer, A., Firmat, C., Nicolas, M., Venner, S., Delzon, S. 2017. Increasing spring temperatures favor oak seed production in temperate areas. Scientific reports: 1-8.Documents numériques
Consultable
Article (2017)URLMaturation et dormance des graines d'Impatiens parviflora DC. / Marie-France Jouret (1974)
PermalinkMesure directe des flux de gènes en forêt / Sophie Gerber (2003)
PermalinkMise en place de mesures de gestion ou de réhabilitation des milieux tourbeux du bassin du Drugeon / Isabelle Diana (2005)
![]()
PermalinkMorphologie des graines des espèces ibéro-baléariques du genre Euphorbia L. (Euphorbiaceae), II. subgen. Esula Pers., I. / Joan Carles Baiges (1989)
PermalinkMorphologie des graines de gymnospermes / Yvette de Ferré in Bulletin de la Société d'histoire naturelle de Toulouse, 76 (2) (1941)
![]()
PermalinkOn the variability among seeds within long pod-like fruits / Sandra Malaval (1996)
PermalinkLe plaisir de faire ses graines / Jérôme Goust (2005)
PermalinkLes ravageurs des cônes et des graines des cyprès dans le pourtour Méditerrannéen : cas de Cyprès de l'Atlas (Cupressus atlantica Gaussen) / My Ahmed El Alaoui El Fels in Naturalia Maroccana, 2 (1-2) (01/2004)
PermalinkRestituer les pratiques agraires par la carpologie archéologique / Laurent Bouby in Études rurales, 153-154 (2000)
![]()
PermalinkRestoration of high altitudes grasslands with indigenous seed mixtures / Bernhard Krautzer (2002)
Permalink