Dissemination and population dynamics of rice in the tropics

热带地区水稻的传播和种群动态

• 批准号: 06041124
• 负责人: SATO Yoichiro
• 金额: $ 8.64万
• 依托单位: Shizuoka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06041124/
• 关键词: wild rice; cultivated rice; origin; evolution; genetic resources; in-situ conservation; Laos; Thailand; 野性稲; 集団の動態; 地理的分布; 生態遺伝; 哉培稲

To know the origin of rice in the tropics, we investigated population dynamics and dissemination of natural populations of wild ancestor of rice (Oryza rufipogon). Also, we investigated genetic feature of cultivated rice in various areas in the tropical Asia. Data obtained were as follows.1. Wild rice is separated in annual and perennial types based on the morphological and physiological features. In the present study, we revealed that most population of annual type had high similarity of indica cultivars, while those of perennial type had that of japonica cultivars. Japonica-like populations were frequently seen in Mekong delta area. People in the area calls wild rich "ghost rice', because such type shows low seed fertility in the natural stand.2 I the present survey, we discovered new populations of wild rice in the north western part of Laos. They were seemingly belonging to perennial type. In the previous survey that was performed in 1983, we observed annual populations in north Thailand that is neighbored to north western Laos. It is interesting why perennial type was seen in Laos while annual was seen in Thailand.3 We attempted to set up four permanent observation sites for in situ conservation of wild rice. One of them was set at Prachinburi Rice Research Center, while other three were set up in Laos. We made observations for population size (density and area), flux and dynamics of the populations.4 In China, recent archaeological works reveals a possibility of the birth of rice and rice cultivation. We attempted to gather such works in the field of archaeology and biology in China.We strongly feels a necessity of the continuous survey of the present project for wild rice in Asia in the future, in order to reach comprehensive understanding of the origin of rice.

为了了解热带地区水稻的起源，我们调查了水稻野生祖先（Oryza rufipogon）自然群体的种群动态和传播。此外，我们还调查了亚洲热带不同地区栽培稻的遗传特征。所得数据如下：1.根据形态和生理特征，将野生稻分为一年生和多年生类型。结果表明，大多数一年生类型群体与籼稻品种具有较高的相似性，而多年生类型群体与粳稻品种具有较高的相似性。在湄公河三角洲地区，粳稻样种群是常见的。该地区的人们称野生丰富的“鬼稻”，因为这种类型显示在自然林低种子肥力。2我目前的调查，我们发现了新的野生稻种群在老挝西北部。它们似乎属于多年生类型。在1983年进行的上一次调查中，我们观察到泰国北部的年度人口，这些人口分布在老挝西北部。有趣的是，为什么在老挝看到多年生类型，而在泰国看到一年生。3我们试图建立四个永久观察点，原位保护野生稻。其中一个设在巴钦布里水稻研究中心，另外三个设在老挝。我们观察了人口规模（密度和面积），人口流动和动态。4在中国，最近的考古工作揭示了水稻和水稻种植诞生的可能性。我们试图收集中国考古学和生物学领域的此类作品，我们强烈认为未来有必要继续对当前亚洲野生稻项目进行调查，以全面了解水稻的起源。

项目成果

佐藤洋一郎: "DNAが語る稲作文明" 日本放送出版協会, 227 (1996)

佐藤洋一郎：《DNA讲述的稻作文明》日本广播出版协会，227（1996）