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学和生态学的观察。在1998-2000年间，我们在老挝、泰国北部、坎多比亚、越南和缅甸旅行。在越南，我们在湄公河下游三角洲收集到了没有受精种子的O.fufipogon斑点。在老挝北部，我们收集了来自旱地的糯米品种，以及野生近亲。此时，我们从中国越过边界，这样就可以很好地观察到中国和老挝之间的差异。在老挝中部，我们在老堡从越南越过边境，前往萨瓦纳基特。在这里，观察到了不同类型的糯米品种。在泰国，我们对种植在旱地上的糯米进行了观察。在泰国，旱地轮作正在消失，因此这一观察结果很有价值。在柬埔寨，我们发现了Oryza属的稀有物种Oridleyi。同时发现洞里萨湖多年生野生稻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Pathein看了伊拉瓦地河里的野生水稻。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多株菌株。这些菌株中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.