Observation of wild and cultivated rice in the tropics

我们在印度支那地区对栽培稻和野生稻进行了遗传和生态方面的观察。1998-2000年期间，我们去了老挝、泰国北部、柬埔寨、越南和缅甸。在越南，我们在湄公河三角洲下游收集了没有受精种子的黄颡鱼。在老挝北部，我们从旱地采集了糯稻品种，以及野生亲缘品种。这个时候，我们从中国越过边界，所以中老之间的差异是很明显的。在老挝中部，我们穿过越南边境，在老堡（Lao-Bao）来到萨瓦纳基（Savanaket）。这里观察了不同类型的糯稻品种。在泰国，我们对种植在旱地的糯米进行了观察。在泰国，旱地轮作现在正在消失，因此观察是有价值的。在柬埔寨，我们发现了一种罕见的Oryza物种o.r ridleyi。同时，我们发现多年生野生稻和一年生野生稻在洞里萨湖是同域分布的。在缅甸，我们进行了两次观察。在第一次观察中，我们去了巴登，在伊洛瓦底河上看到了野生水稻。在第二次任务中，我们前往缅甸北部的克钦邦。通过这次旅行，我们收集了500多个菌株。这些病毒的一部分一直存在于泰国和日本这两个国家。

We have made observations in Indochina area, for cultivated and wild rice in terms of genetics and ecology. During 1998-2000, we traveled in Laos, Northern Thailand, Camdobia, Vietnam and Myanmar. In Vietnam, we collected O.fufipogon stains having no fertilse seeds in the lower Mekong delta. In northern Laos, we collected glutinous cultivars from upland fields, as well as wild relatives. At this time, we crossed border from China, so that differences between China and Laos is well observed. In the central Laos, we crossed border from Vietnam at Lao-Bao, and traveled to Savanaket. Here, different type of glutinous cultivars were observed. In Thailand, we made observations for glutinous rice that were grown at upland fields. In Thailand, upland shifting cultivation is now being vanishing, so that the observation was valuable. In Cambodia, we discovered O.ridleyi that is a rare species of Oryza species. At the same time, we found perennial and annual wild rice are sympatric in Tonle Sap lake. In Myanmar, we made observations twice. In the first observation, we went to Pathein to see wild rice in Irawadhi river. In the second mission, we traveled in Kachin state, a northern Myanmar. Through the travel, we collected more than 500 strains. A part of those strains have been keeping in each country, Thailand and Japan.