caa a22 4500 475817494 CHVBK 20180406123812.0 cr unu---uuuuu 170329e20000101xx s 000 0 eng 10.1007/s004970050009 doi (NATIONALLICENCE)springer-10.1007/s004970050009 Dioecious Silene at the X-road: the reasons Y [Elektronische Daten] [F. Monéger, N. Barbacar, I. Negrutiu] Abstract : Among the variety of breeding systems developed by flowering plants, those based on heteromorphic sex chromosomes are the most intellectually challenging in evolutionary terms. This is because, among other things, they enable us to compare sex determination processes between plants and animals. White campion (Silene latifolia, also named Lychnis or Melandrium) is dioecious and, much like us, females are homogametic (XX) and males are heterogametic (XY). Sexual dimorphism in white campion is controlled by two independent developmental pathways operating from the Y chromosome at very early developmental stages and within distinct regions of the flower. In addition, all basic steps in the evolution from the bisexual to the dioecious condition with heteromorphic sex chromosomes are known and available to experimentation in the genus Silene. This group of species has been under scrutiny for more than a century. Such an ideal experimental system enables us to tackle, with novel methodological tools, several classical questions in biology. These include the question of how sexual dimorphism evolved and how dimorphic development is controlled, as well as questions of how sex chromosomes evolve in the absence of meiotic recombination or how male-female genetic conflicts are generated. At the turn of the century, the time is now ripe to have a closer look. Springer-Verlag Berlin Heidelberg, 2000 Key words Sex chromosomes nationallicence Dioecy nationallicence Sex chromosome evolution nationallicence Silene latifolia nationallicence Monéger F. Ecole Normale Supérieure de Lyon, Reproduction et Développement des Plantes, 46 Allée d'Italie, 69364 Lyon Cedex 07, France e-mail: Ioan.Negrutiu@ens-lyon.fr Fax: +33-04-72-72-8600, FR aut Barbacar N. Ecole Normale Supérieure de Lyon, Reproduction et Développement des Plantes, 46 Allée d'Italie, 69364 Lyon Cedex 07, France e-mail: Ioan.Negrutiu@ens-lyon.fr Fax: +33-04-72-72-8600, FR aut Negrutiu I. Ecole Normale Supérieure de Lyon, Reproduction et Développement des Plantes, 46 Allée d'Italie, 69364 Lyon Cedex 07, France e-mail: Ioan.Negrutiu@ens-lyon.fr Fax: +33-04-72-72-8600, FR aut https://doi.org/10.1007/s004970050009 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s004970050009 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Monéger F. Ecole Normale Supérieure de Lyon, Reproduction et Développement des Plantes, 46 Allée d'Italie, 69364 Lyon Cedex 07, France e-mail: Ioan.Negrutiu@ens-lyon.fr Fax: +33-04-72-72-8600, FR aut NATIONALLICENCE 700 1- Barbacar N. Ecole Normale Supérieure de Lyon, Reproduction et Développement des Plantes, 46 Allée d'Italie, 69364 Lyon Cedex 07, France e-mail: Ioan.Negrutiu@ens-lyon.fr Fax: +33-04-72-72-8600, FR aut NATIONALLICENCE 700 1- Negrutiu I. Ecole Normale Supérieure de Lyon, Reproduction et Développement des Plantes, 46 Allée d'Italie, 69364 Lyon Cedex 07, France e-mail: Ioan.Negrutiu@ens-lyon.fr Fax: +33-04-72-72-8600, FR aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer