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的遗传和生态进行了观察。在1998-2000年期间，我们去了老挝、泰国北方、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O.fufipogon菌株。在老挝北方，我们收集了来自高地的糯品种，以及野生亲缘。在这个时候，我们从中国越过边境，所以中国和老挝之间的差异是很好的观察。在老挝中部，我们从越南的Lao-Bao越过边境，前往Savanaket。在这里，不同类型的糯品种进行了观察。在泰国，我们对生长在高地的糯米进行了观察。在泰国，高地轮垦现在正在消失，因此观察是有价值的。在柬埔寨，我们发现了稻属中的一种稀有物种--里德利稻（O.ridleyi）。同时，我们发现洞里萨湖的多年生和一年生野生稻是同域分布的。在缅甸，我们进行了两次观察。在第一次观察中，我们去了Pathein，看了位于瓦底河的野生稻。在第二次使命中，我们在缅甸北方的克钦邦旅行。通过旅行，我们收集了500多个菌株。这些菌株的一部分一直保持在每个国家，泰国和日本。

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.