title: Difference in flowering time can initiate speciation of nocturnally flowering species.
abstract: Isolation mechanisms that prevent gene flow between populations prezygotically play important roles in achieving speciation. In flowering plants, the nighttime flowering system provides a mechanism for isolation from diurnally flowering species. Although this system has long been of interest in evolutionary biology, the evolutionary process leading to this system has yet to be elucidated because of the lack of good model species. However, the genetic mechanisms underlying the differences in flowering times and the traits that attract pollinators between a pair of diurnally and nocturnally flowering species have recently been identified in a few cases. This identification enables us to build a realistic model for theoretically studying the evolution of a nocturnally flowering species. In this study, based on previous experimental data, we assumed a model in which two loci control the flowering time and one locus determines a trait that attracts pollinators. Using this model, we evaluated the possibility of the evolution of a nocturnally flowering species from a diurnally flowering ancestor through simulations. We found that a newly emerging nighttime flowering flower exhibited a sufficiently high fitness, and the evolution of a nocturnally flowering species from a diurnally flowering species could be achieved when hybrid viability was intermediate to low, even in a completely sympatric situation. Our results suggest that the difference in flowering time can act as a magic trait that induces both natural selection and assortative mating and would play an important role in speciation between diurnally and nocturnally flowering species pairs.
authors: Graduate School of Systems Life Sciences, Kyushu University 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan. Electronic address: tomotakamatsumoto2@gmail.com.
authors: Tomotaka
authors: T
authors: Matsumoto
authors: Department of Biology, Faculty of Sciences, Kyushu University 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan.
authors: Akiko A
authors: AA
authors: Yasumoto
authors: Department of Biology, Faculty of Sciences, Kyushu University 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan.
authors: Kozue
authors: K
authors: Nitta
authors: Graduate School of Systems Life Sciences, Kyushu University 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan.
authors: Shun K
authors: SK
authors: Hirota
authors: Department of Biology, Faculty of Sciences, Kyushu University 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan.
authors: Tetsukazu
authors: T
authors: Yahara
authors: Department of Biology, Faculty of Sciences, Kyushu University 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan.
authors: Hidenori
authors: H
authors: Tachida
mesh_terms: D000818:Animals; D005075:Biological Evolution; D035264:Flowers / Q000235:genetics* / Q000502:physiology*; D049810:Genetic Speciation; D005838:Genotype; D031421:Hemerocallis / Q000235:genetics / Q000502:physiology; D006824:Hybridization, Genetic; D008954:Models, Biological; D010641:Phenotype; D054817:Pollination / Q000502:physiology; D011336:Probability; D019655:Quantitative Trait, Heritable; D012639:Seeds / Q000502:physiology; D013997:Time Factors
keywords: Flowering time; Magic trait; Reproductive isolation; Theoretical study