Catégories
Documents disponibles dans cette catégorie (44)
Affiner la recherche
Etudes sur les cycadales - I Méiose et mégasporogenèse chez Encephalartos poggei Asch. / Jean-Louis De Sloover (1961)
Titre : Etudes sur les cycadales - I Méiose et mégasporogenèse chez Encephalartos poggei Asch. Type de document : Tiré à part de revue Auteurs : Jean-Louis De Sloover (1936-) Année de publication : 1961 Importance : 104-116 Langues : Français (fre) Catégories : [CBNPMP-Thèmes] Gymnospermes
[CBNPMP-Thèmes] Biologie de la reproductionPermalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=130237 De Sloover, J.L. 1961. Etudes sur les cycadales - I Méiose et mégasporogenèse chez Encephalartos poggei Asch. La Cellule, 52(1) : 104-116.Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 8100 6260 Tiré à part Centre de documentation Bibliothèque Consultable Fitness constraints on flower number, seed number and seed size in the dimorphic species Primula farinosa L. and Armeria maritima (Miller) Willd. / K. Baker in New Phytologist, 128 (3) (1994)
[article]
Titre : Fitness constraints on flower number, seed number and seed size in the dimorphic species Primula farinosa L. and Armeria maritima (Miller) Willd. Type de document : Imprimé Auteurs : K. Baker ; A.J. Richards ; M. Tremayne Année de publication : 1994 Article en page(s) : 563-570 Langues : Anglais (eng) Catégories : [CBNPMP-Thèmes] Biologie de la reproduction
[CBNPMP-Thèmes] Stratégie de production de semences (fécondité)Mots-clés : Armeria maritima Willd. [1809] Primula farinosa L. Résumé : Using two dimorphic species with diallelic incompatibility, Primula farinosa L. and Armeria maritima (Miller) Willd., we tested the hypothesis that an association of seedling performance with seed size, and an inverse association of seed size with seed number, might, contrary to most fitness models, select for plants which set relatively few seeds. In P. farinosa we discovered positive relationships between seed number per capsule and capsule number per inflorescence. As capsules are formed in most flowers, scapes with few flowers set the fewest seeds per capsule. This suggests that conspicuousness to pollinators and/or plant resource play an important role in reproductive success in this species. Seed size and seedling performance were also positively associated. For P. farinosa, which has multi-seeded fruits, we discovered an inverse association between seed size and seed number for capsules containing more than 65 seeds. We suggest that stabilizing selection may occur for flower number per inflorescence in this species, as inflorescences with 8–11 capsules tend to set many seeds which may be inefficiently small. This tends to confirm our hypothesis. However, for A. maritima there is a positive association between seed size and seed number per inflorescence. For such plants with single-seeded fruits there should be directional selection for large flower number pet-inflorescence, a trend which may have led to the evolution of the capitulum. Lien pérenne : DOI : 10.1111/j.1469-8137.1994.tb03002.x Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=137387
in New Phytologist > 128 (3) (1994) . - 563-570Baker, K., Richards, AJ., Tremayne, M. 1994. Fitness constraints on flower number, seed number and seed size in the dimorphic species Primula farinosa L. and Armeria maritima (Miller) Willd. New Phytologist, 128(3): 563-570.Documents numériques
Consultable
Article (1994)URL
Titre : Floral sex ratios and gynomionoecy in Aster (Asteraceae) Type de document : Tiré à part de revue Auteurs : R. Bertin ; M. Kerwin Année de publication : 1998 Importance : 235-244 Langues : Anglais (eng) Catégories : [CBNPMP-Thèmes] Biologie de la reproduction Mots-clés : Aster Résumé : Gynomonoecy is the sexual system in which female and bisexual flowers occur on the same plant. This system has received little attention despite the considerable work on other plant sexual systems in the past few decades. Our study examines one hypothesized advantage of having two flower types on a plant, namely that this arrangement permits flexibility in allocation of resources to male and female reproductive functions. We examined 16 species of Aster (Asteraceae), a genus of gynomonoecious, perennial herbs. Plants in this genus produce heads consisting of a whorl of female flowers around a cluster of bisexual flowers. Among field-grown plants we found no evidence that plant size, date, position of heads, rainfall, or shade influenced the proportion of female flowers. A series of greenhouse experiments likewise revealed no large or consistent effects of light, nutrients, or position of heads on the proportion of ray flowers. While floral ratios proved very stable in the face of environmental and physiological variables, they exhibited significant variation among plants and among sibships in most species. We conclude that the presence of two flower types in gynomonoecious asters is not advantageous in permitting flexibility in allocation of resources to male and female functions. We believe that the advantage of the female flowers in aster heads lies either in reducing pollen-pistil interference or in attracting pollinators. Lien pérenne : DOI : 10.2307/2446311 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=130808 Bertin, R., Kerwin, M. 1998. Floral sex ratios and gynomionoecy in Aster (Asteraceae). American Journal of Botany, 85(2) : 235-244.Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 11512 B Tiré à part Centre de documentation Tirés à part Consultable Documents numériques
Consultable
Article (1998)URL Flowering and fruiting phenology and breeding system of Cistus albidus L. / S. Blasco in Acta botanica gallica, 142 (3) (1995)
[article]
Titre : Flowering and fruiting phenology and breeding system of Cistus albidus L. Type de document : Imprimé Auteurs : S. Blasco ; I. Mateu Année de publication : 1995 Article en page(s) : 245-251 Langues : Anglais (eng) Catégories : [CBNPMP-Thèmes] Biologie florale, floraison
[CBNPMP-Thèmes] Biologie de la reproduction
[CBNPMP-Thèmes] PhénologieMots-clés : Cistus albidus L. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=137517
in Acta botanica gallica > 142 (3) (1995) . - 245-251Blasco, S., Mateu, I. 1995. Flowering and fruiting phenology and breeding system of Cistus albidus L. Acta botanica gallica, 142(3): 245-251.Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité R207 P-286 Revue Centre de documentation Revues Consultable Flowering phenology and reproductive effort of the invasive alien plant Heracleum mantegazzianum / Irena Perglova in Preslia, 78 (2006)
[article]
Titre : Flowering phenology and reproductive effort of the invasive alien plant Heracleum mantegazzianum Type de document : Électronique Auteurs : Irena Perglova ; Jan Pergl (1977-) ; Petr Pyšek Année de publication : 2006 Article en page(s) : 265-285 Langues : Anglais (eng) Catégories : [CBNPMP-Thèmes] Biologie de la reproduction
[CBNPMP-Thèmes] Plantes subspontanées, naturalisées, envahissantesMots-clés : Heracleum mantegazzianum Sommier & Levier Résumé : Heracleum mantegazzianum is one of the most invasive species in the Czech flora. The present study describes its flowering phenology and assess the effectiveness of protandry in preventing selfing in this self-compatible species, describes the timing of flowering in a heavily invaded area of Slavkovský les (Czech Republic) and estimates fruit set in a large sample of plants, which provides reliable data on the often exaggerated fecundity of this species. The study of flowering phenology revealed that protandry is always effective only within individual flowers, where male and female flowering phases are completely separated. In contrast, anther dehiscence in some flowers can occasionally overlap with stigma receptivity in other flowers in the same umbel, providing an opportunity for geitonogamous (i.e. between-flower) selfing. Nevertheless, the potential for selfing in H. mantegazzianum is determined mainly by an overlap in the male and female flowering phases between umbels on the same plant; at least a short overlap between some umbels was observed in 99% of the plants at the Slavkovský les. Although the degree of protandry in H. mantegazzianum favours outcrossing, the opportunity to self may be of crucial importance for an invasive plant, especially if a single plant colonizes a new location. At Slavkovský les, flowering started within one week (from 20 to 27 June 2002) at all 10 sites. The duration of flowering of an individual plantwas on average 36 days,with maximum of 60 days, and increased significantly with the number of umbels on a plant. In the second half of August, the majority of the fruits were ripe and had started to be shed. The beginning of flowering of a plant was significantly negatively correlated with the number of umbels it had – the earlier a plant started to flower the more umbels it had produced. A significant negative relationship was also found between basal diameter and beginning of flowering; plants with large basal diameters started to flower earlier. An average plant at Slavkovský les produced 20,671 fruits. Of these, 44.6% were produced by the terminal umbel, 29.3% by secondary umbels on satellites, 22.6% by secondary umbels on branches and only 3.5% by tertiary umbels. The estimated fruit number of the most fecund plant was 46,470 – compared to an average plant, the proportional contribution of tertiary umbels increased relative to the primary umbel. This study revealed a significant positive relationship between fecundity and plant basal diameter. Although the results of this study indicate that the fecundity of this species is often overestimated in the literature, the number of fruits produced by H. mantegazzianum provides this invasive species with an enormous reproductive capacity. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=142552
in Preslia > 78 (2006) . - 265-285Perglova, I., Pergl, J., Pyšek, P. 2006. Flowering phenology and reproductive effort of the invasive alien plant Heracleum mantegazzianum. Preslia, 78: 265-285.Documents numériques
Consultable
Article (2006)Adobe Acrobat PDF Fruit-set and recruitment in populations of Cypripedium calceolus L. in Estonia / Tiiu Kull in Botanical journal of the Linnean Society, 126 (1-2) (1998)
PermalinkGamétophytes et gamétogenèse dans le genre Marsilea / M.J. Demalsy-Feller (1957)
PermalinkLe genre Serapias Linné 1773 / Gérard Joseph in Isatis, 1 (2001)
PermalinkPermalinkHay-meadows production and weed dynamics as influenced by management / Danièle Magda (2003)
PermalinkII Congreso de biología de la conservación de plantas : programa y libro de resúmenes / Jardín botánico atlántico (2005)
PermalinkInbreeding depression in two populations of Arenaria uniflora (caryophyllaceae) with contrasting mating systems / Lila Fishman in Heredity, 86 (2) (02/2001)
PermalinkIncidences conservatoires et systématiques d'une étude morphologique, biologique et cytogénétique de l'Eryngium viviparum Gay, taxon au bord de l'extinction / Stéphane Buord in Bulletin de la Société botanique du Centre-ouest. Numéro spécial, 19 (n.s.) (1999)
PermalinkMating system of yellow starthistle (Centaurea solstitialis), a successful colonizer in North America / M. Sun in Heredity, 80 (2) (02/1998)
PermalinkLes mouvements des végétaux / Paul-Emile Pilet (1953)
Permalink