雌雄異株植物においては、雄株は花粉の、雌株は種子の散布を通じて自身の遺伝子を分散させる。また、個体の適応度を決める選択圧は、雌雄間で異なるだろう。これらの違いは、種内の対立遺伝子組成や遺伝的多様性の雌雄間の違いを生む可能性があるが、これを検討した事例はまったく見られない。本研究では、近畿地方における4種の雌雄異株樹種、ナギ、アカメガシワ、カゴノキ、シロダモを対象として、RADシーケンス法により、雌雄6個体ずつの1塩基多型 をゲノムワイドに検出した。個体群内の塩基多様度Piは、順に、0.0020、0.0027、0.0046、0.0046と種間で差が見られ、特に、国内外来種であるナギでは、遺伝的多様性が低かった。本研究ではさらに、集団遺伝学的情報の雌雄の個体群間での比較を試みる。

In dioecious plants, males and females disperse their genes through pollen and seed dispersal, respectively. Furthermore, selective pressures that determine their fitness will be different between males and females. Although these differences would induce the differences of allelic composition and genetic diversity between sexes, they are not studied yet. Here, four dioecious tree species, SNPs were detected by RAD-sequence for four dioecious  tree species, Nageia nagi, Mallotus japonica, Litsea coreana and Neolitsea sericea in Kinki Region, Japan. The values of nucleotide diversity, Pi, were 0.0020, 0.0027, 0.0046 and 0.0046, respectively. The values were different among species. In particular, N. nagi, an alien species, had lower genetic diversity than other native dioecious trees. In this study, we will try to compare the information of population genetics between males and females.