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1.温带地区粳稻育种成果:日本全国有16个地方从事水稻育种工作,由农林省统一领导。“农林”编号的水稻品种有228个,陆稻50个,平均每年约可提出10个新品种。过去一个品种栽种10～15年,甚至20年。1965年开始按计划每3年更换一次新品种。日本的水稻育种,目前仍是以集团和系谱相结合的杂交育种为主要方法,同时也开展一些其它有关的选育方法的探索和基础理论研究。育种目标着重于生态类型的选育,一般除要
1. Temperate japonica rice breeding results: There are 16 places in Japan engaged in rice breeding work, unified by the Ministry of Agriculture and Forestry leadership. There are 228 rice varieties numbered “Agriculture and Forestry”, and 50 are paddy soils. On average, about 10 new varieties can be proposed each year. In the past a species planted 10 to 15 years, or even 20 years. In 1965 began to be replaced every three years as planned new varieties. Japan’s rice breeding is still the main method of hybrid breeding based on the combination of group and pedigree. At the same time, some other related breeding methods and basic theoretical researches are also carried out. Breeding objectives focus on the ecological type of breeding, in addition to the general