Catégories
Documents disponibles dans cette catégorie (48)
![](./images/expand_all.gif)
![](./images/collapse_all.gif)
![Tris disponibles](./images/orderby_az.gif)
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, Jean-Louis (1936-) 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, A.J., 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)URLFloral dimorphism, pollination, and self-fertilization in gynodioecious Geranium richardsonii (Geraniaceae) / C.F. Williams in American Journal of Botany, 87 (5) (05/2000)
![]()
[article]
Titre : Floral dimorphism, pollination, and self-fertilization in gynodioecious Geranium richardsonii (Geraniaceae) Type de document : Imprimé Auteurs : C.F. Williams ; Margaret A. Kuchenreuther ; A. Drew Année de publication : 2000 Article en page(s) : 661-669 Langues : Anglais (eng) Catégories : [CBNPMP-Thèmes] Biologie de la reproduction
[CBNPMP-Thèmes] Biologie florale, floraisonMots-clés : Geranium Geranium richardsonii Résumé : The selective maintenance of gynodioecy depends on the relative fitness of the male-sterile (female) and hermaphroditic morphs. Females may compensate for their loss of male fitness by reallocating resources from male function (pollen production and pollinator attraction) to female function (seeds and fruits), thus increasing seed production. Females may also benefit from their inability to self-fertilize if selfing and inbreeding depression reduce seed quality in hermaphrodites. We investigated how differences in floral resource allocation (flower size) between female and hermaphroditic plants affect two measures of female reproductive success, pollinator visitation and pollen receipt, in gynodioecious populations of Geranium richardsonii in Colorado. Using emasculation treatments in natural populations, we further examined whether selfing by autogamy and geitonogamy comprises a significant proportion of pollen receipt by hermaphrodites. Flowers of female plants are significantly smaller than those of hermaphrodites. The reduction in allocation to pollinator-attracting structures (petals) is correlated with a significant reduction in pollinator visitation to female flowers in artificial arrays. The reduction in attractiveness is further manifested in significantly less pollen being deposited on the stigmas of female flowers in natural populations. Autogamy is rare in these protandrous flowers, and geitonogamy accounts for most of the difference in pollen receipt between hermaphrodites and females. Female success at receiving pollen was negatively frequency dependent on the relative frequency of females in populations. Thus, two of the prerequisites for the maintenance of females in gynodioecious populations, differences in resource allocation between floral morphs and high selfing rates in hermaphrodites, occur in G. richardsonii. Lien pérenne : DOI : 10.2307/2656852 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=137575
in American Journal of Botany > 87 (5) (05/2000) . - 661-669Williams, C.F., Kuchenreuther, Margaret A., Drew, A. 2000 Floral dimorphism, pollination, and self-fertilization in gynodioecious Geranium richardsonii (Geraniaceae). American Journal of Botany, 87(5): 661-669.Documents numériques
Consultable
article (2000)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)URLFlowering 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)
![]()
PermalinkFruit-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)
PermalinkMale sterility, protogyny, and pollen-pistil interference in Plantago maritima (Plantaginaceae), a wind-pollinated, self-incompatible perennial / Patrik Dinnétz in American Journal of Botany, 84 (11) (1997)
![]()
Permalink