Basic studies on in situ conservation of plant genetic resources

近年来，人们越来越重视植物遗传资源的就地保护。然而，缺乏执行该计划所需的基本信息。本研究旨在通过实验和理论相结合的方法，探索自然生境中植物遗传多样性保护的基础研究.在过去的10年里，我们一直在监测七个野生稻（Oryza rufipogon）人口在曼谷郊区。在此期间积累的观测和实验数据的基础上，如何选择和如何管理自然种群在该物种的保护进行了思考。多年生和一年生野生稻的生活史、种群统计学和遗传群体结构的差异表明，多年生野生稻的种群数量少但数量大，一年生野生稻的种群数量少但数量多是适宜的.在理论研究中，阐明了不同异交率和迁移率下的边缘效应（群体中心和边缘基因频率和遗传多样性的差异）。此外，有效种群大小是通过有性和无性方式繁殖的种群。

Recently the need for in situ conservation of plant genetic resources is more and more anticipated. However, basic information necessary for its implementation is lacking. In the present study, we aimed to explore basic research on conservation of plant genetic diversity in natural habitants through experimental as well as theoretical approaches.1. During the last 10 years, we have been monitoring seven wild rice (Oryza rufipogon) populations in the suburbs of Bangkok. Based on the observational and experimental data accumulated during this period, how to select and how to manage natural populations to be conserved in this species was considered. Differential life history, demography and genetic population structure found between perennial and annual types of this wild rice species suggested that a few but large populations for perennials, and small many populations for annuals but may be appropriate.2. In theoretical study, edge effect (difference in gene frequency and genetic diversity between center and periphery of a population) was elucidated under the different rates of outcrossing and migration. Further, effective population size was the population which propagates by both sexual and asexual means.