Floral biology and pollination mechanisms of four Mexico-endemic Fuchsia species with contrasting reproductive systems  

作　　者：Clementina González Anai Alvarez-Baños Eduardo Cuevas 

机构地区：[1]CONACYT-Instituto de Investigaciones sobre los Recursos Naturales,Universidad Michoacana de San Nicolás de Hidalgo,Av.San Juanito Itzícuaro s/n,Col.Nueva Esperanza,Morelia Michoacán 58330,México [2]Facultad de Biología,Universidad Michoacana de San Nicolás de Hidalgo,Av.Francisco J.Mújica S/N,Ciudad Universitaria,Morelia,Michoacán 58030,México [3]Departamento de Biología Vegetal y Ecología,Universidad de Sevilla,Apartado 1095,41080 Sevilla,Spain

出　　处：《Journal of Plant Ecology》2018年第1期123-135,共13页植物生态学报（英文版）

基　　金：This work was funded by a masters scholarship to A.A.-B.(no.270296);a research grant to E.C.from the Consejo Nacional de Ciencia y Tecnología(CONACyT grant no.105952);from the Universidad Michoacana de San Nicolás de Hidalgo.

摘　　要：Aims The evolution of the outstanding variation of reproductive systems in angiosperms has been considered an important driver of line-age diversification.Closely related hermaphroditic and dioecious species with biotic pollination provide the opportunity to study and compare traits related to pollinator attraction and their con-sequences on reproductive components.A higher predictability of pollination syndromes is expected in dioecious species,which are dependent on pollinators,than in self-compatible hermaphroditic taxa.Dioecious species may suffer pollen limitation depending on the quality of floral rewards and the kind and abundance of pollina-tors,whereas no pollen limitation is expected in hermaphroditic spe-cies with autonomous self-pollination.Additionally,in the absence of pollen limitation,more or better seeds are expected in dioecious species,according to the sexual specialization hypothesis.Methods In natural populations of the hermaphroditic Fuchsia fulgens and Fuchsia arborescens and dioecious Fuchsia parviflora and Fuchsia obconica,all endemic to Mexico,we first described flower phenol-ogy,flower production and longevity and nectar volume and concen-tration.Then,we evaluated the correspondence between floral visitors and pollination syndromes.In hermaphrodite plants,we determined the level of herkogamy and the potential for autonomous self-pollina-tion.Finally,we evaluated the effect of pollen limitation on fruit set and seed number and assessed seed germination for all species.Important Findings In contrast to our prediction,dioecious species did not show a higher correspondence between pollination syndromes and floral visitors than did hermaphrodites;however,male flowers exhib-ited a higher correspondence than female flowers.No pollen limitation was detected in dioecious species,for which visitation rate did not differ between male and female flowers.The her-maphroditic F.fulgens showed pollen limitation for seed number,despite the presence of autonomous selfing.Fruit set from auton-omous pollin

关 键 词：DIOECY HERKOGAMY HERMAPHRODITISM pollen limitation pollination syndromes 

分 类 号：R31[医药卫生—基础医学]