Basic studies on in situ conservation of plant genetic resources

近年来，人们对植物遗传资源就地保护的需求越来越高。但是，缺乏执行该计划所需的基本资料。在本研究中，我们旨在通过实验和理论方法探索自然生境植物遗传多样性保护的基础研究。在过去的10年里，我们一直在监测曼谷郊区的7个野生水稻种群。根据这一时期积累的观测和实验数据，对如何选择和管理该物种的自然保护种群进行了思考。多年生型和一年生型野生稻的生活史、人口统计学和遗传群体结构的差异表明，多年生型的种群数量少而多，一年生型的种群数量少而多，但可能是合适的。在理论研究中，阐明了在不同的异交率和迁移率下的边缘效应（种群中心和外围基因频率和遗传多样性的差异）。有效种群大小是指通过有性繁殖和无性繁殖两种方式繁殖的种群。

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.