caa a22 4500 475806468 CHVBK 20180406123748.0 cr unu---uuuuu 170329e20000901xx s 000 0 eng 10.1007/BF00985276 doi (NATIONALLICENCE)springer-10.1007/BF00985276 The evolution of pollen heteromorphism in Viola [Elektronische Daten] A phylogenetic approach [S. Nadot, H. Ballard Jr, J. Creach, I. Dajoz] Pollen heteromorphism, defined here as the production within all flowers of a plant of several pollen morphs differing in aperture number, is common in angiosperms. We have focused on the evolution of pollen heteromorphism in the genusViola, in which about 1/3 of the species are pollen-heteromorphic. We have studied the distribution of pollen heteromorphism in the genusViola using a molecular phylogeny based on ITS sequence data. We show that pollen heteromorphism has evolved independently at least six times inViola. A comparative analysis shows that the occurrence of pollen heteromorphism is correlated with sporophytic polyploidy in all sections of the genus apart from sectionMelanium. This section differs from all other sections on several aspects such as flower morphology, absence of cleistogamous flowers, and a high proportion of heteromorphic species. We discuss the possible adaptiveness of pollen heteromorphism in this section. Springer-Verlag, 2000 Pollen heteromorphism nationallicence Viola (Violaceae) nationallicence phylogeny nationallicence comparative analysis nationallicence sporophytic ploidy level nationallicence Nadot S. Laboratoire Evolution et Systématique, Université Paris-Sud, Orsay, France aut Ballard Jr H. Department of Environmental and Plant Biology, Porter Hall, Ohio University, Athens, OH, USA aut Creach J. Laboratoire Evolution et Systématique, Université Paris-Sud, Orsay, France aut Dajoz I. Laboratoire d'Ecologie, Ecole Normale Supérieure, Paris, France aut Plant Systematics and Evolution Springer-Verlag 223/3-4(2000-09-01), 155-171 0378-2697 223:3-4<155 2000 223 606 https://doi.org/10.1007/BF00985276 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00985276 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nadot S. Laboratoire Evolution et Systématique, Université Paris-Sud, Orsay, France aut NATIONALLICENCE 700 1- Ballard Jr H. Department of Environmental and Plant Biology, Porter Hall, Ohio University, Athens, OH, USA aut NATIONALLICENCE 700 1- Creach J. Laboratoire Evolution et Systématique, Université Paris-Sud, Orsay, France aut NATIONALLICENCE 700 1- Dajoz I. Laboratoire d'Ecologie, Ecole Normale Supérieure, Paris, France aut NATIONALLICENCE 773 0- Plant Systematics and Evolution Springer-Verlag 223/3-4(2000-09-01), 155-171 0378-2697 223:3-4<155 2000 223 606 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer