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Ajouter le résultat dans votre panierDistance-dependent performance of asexual progeny in Allium vineale (Liliaceae) / Margaret L. Ronsheim in American Journal of Botany, 84 (9) (1997)
Titre : Distance-dependent performance of asexual progeny in Allium vineale (Liliaceae) Type de document : Imprimé Auteurs : Margaret L. Ronsheim Année de publication : 1997 Article en page(s) : 1279-1284 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Régime et stratégie de reproduction (allogamie, autogamie, apomixie, reproduction asexué) Mots-clés : Allium vineale L. Allium Résumé : Local adaptation within and among populations may have an impact on processes ranging from speciation to the evolution of mixed breeding systems and dispersal strategies. It is also one potential factor that could favor the production of asexual over sexual propagules. This field experiment tested whether asexually produced bulbils of Allium vineale demonstrate local adaptation to the parental microsite at the scale of natural dispersal from the parent (5, 25, 50, 100, and 1000 cm). Both “home” and randomly chosen “away” genotypes were planted at each location to determine the relative performance of the “home” genotype. Overall, bulbil performance declined with distance from the parent. In particular, “home” bulbils outperformed “away” bulbils at a distance of 25 cm from the parent, indicating that local adaptation has occurred at the scale of natural dispersal in this species. The variance in propagule performance also increased at farther distances from the parent, indicating that the predictability of offspring performance decreases with distance. Fine-scale local adaptation within the range of seed dispersal in this population may be one factor favoring asexual reproduction in Allium vineale. Lien pérenne : DOI : 10.2307/2446053 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=137602
in American Journal of Botany > 84 (9) (1997) . - 1279-1284Ronsheim, Margaret L. 1997 Distance-dependent performance of asexual progeny in Allium vineale (Liliaceae). American Journal of Botany, 84(9): 1279-1284.Documents numériques
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Article (1997)URL
Titre : Reproductive allocation and resource compensation in male-sterile and hermaphroditic plants of Plantago lanceolata (Plantaginaceae) Type de document : Imprimé Auteurs : Pieter Poot Année de publication : 1997 Article en page(s) : 1256-1265 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Génétique et écologie (dynamique, démographique, sélection) Mots-clés : Plantago Plantago lanceolata L. Résumé : Gynodioecy is a breeding system in which hermaphrodites coexist with male steriles. Theoretical models predict that without any compensation in female fitness male steriles will disappear from a population due to their reproductive disadvantage. In the present study I investigated whether male-sterile (MS), partially male-sterile (IN), and hermaphroditic (H) plants of Plantago lanceolata differed in reproductive growth and allocation. Offspring of three interpopulation crosses segregating all three sex morphs were grown under nitrogen-limited conditions in a growth chamber. Independent of the genetic background MS plants attained a higher vegetative and reproductive dry mass and a higher reproductive output than H plants, whereas IN plants had intermediate values. When corrected for the mass of the pollen, the dry mass differences between the sex morphs were much reduced but still present. However, when whole-plant allocation was expressed on the basis of nitrogen, the differences between the sex morphs disappeared. Thus the sex morphs took up similar amounts of nitrogen but distributed them differently. The MS and IN plants used the nitrogen saved by not producing pollen for additional vegetative as well as reproductive growth. The data presented in this study suggest that resource compensation is one of the main mechanisms responsible for the maintenance of MS and IN plants in gynodioecious P. lanceolata. Lien pérenne : DOI : 10.2307/2446050 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=137648
in American Journal of Botany > 84 (9) (1997) . - 1256-1265Poot, Pieter 1997 Reproductive allocation and resource compensation in male-sterile and hermaphroditic plants of Plantago lanceolata (Plantaginaceae). American Journal of Botany, 84(9): 1256-1265.Documents numériques
Article (1997)URL
