首页 | 本学科首页   官方微博 | 高级检索  
   检索      


Complex heterochrony underlies the evolution of Caenorhabditis elegans hermaphrodite sex allocation
Authors:Nausicaa Poullet  Anne Vielle  Clotilde Gimond  Sara Carvalho  Henrique Teotónio  Christian Braendle
Institution:1. Université Nice Sophia Antipolis, CNRS, Inserm, IBV, Parc Valrose, Nice, France;2. Instituto Gulbenkian de Ciência, Oeiras, Portugal;3. Institut de Biologie, école Normale Supérieure, Paris, France
Abstract:Hermaphroditic organisms are key models in sex allocation research, yet the developmental processes by which hermaphrodite sex allocation can evolve remain largely unknown. Here we use experimental evolution of hermaphrodite‐male (androdioecious) Caenorhabditis elegans populations to quantify the developmental changes underlying adaptive shifts in hermaphrodite sex allocation. We show that the experimental evolution of increased early‐life self‐fertility occurred through modification of a suite of developmental traits: increased self‐sperm production, accelerated oogenesis and ovulation, and increased embryo retention. The experimental evolution of increased self‐sperm production delayed entry into oogenesis—as expected, given the sequentially coupled production of self‐spermatogenesis and oogenesis. Surprisingly, however, delayed oogenesis onset did not delay reproductive maturity, nor did it trade‐off with gamete or embryo size. Comparing developmental time dynamics of germline and soma indicates that the evolution of increased sperm production did not delay reproductive maturity due to a globally accelerated larval development during the period of self‐spermatogenesis. Overall, heterochrony in gametogenesis and soma can explain adaptive shifts in hermaphrodite sex allocation.
Keywords:Caenorhabditis elegans  evolution of development  experimental evolution  hermaphrodite  mating system evolution
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号