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水稻常常因为不良自然环境与栽培条件的影响、天然串花与机械混杂以及自然变异与自然选择结果等原因,使品种良好的经济性状发生退化,产生坏的变异。原种繁育的目的,在于消除坏变异,将良种固有的特性及在发展中的好变异、好特性积累起来,繁殖下去,使其不断提高,向前发展。一句话,原种繁育工作,就是反退化的工作。因此,它不只是单纯地保持良种纯度与性状,而是要通过各种技术措施,促使良种不断提高,增强高产性能。实践证明,保持和提高良种种性,一般能增产3—20％。 近年来,在世界范围内,水稻原种繁育工作,
Rice is often due to adverse natural environment and the impact of cultivation conditions, natural crosses and mechanical hybrid and natural variation and natural selection results and other reasons, so that varieties of good economic traits degenerate, resulting in bad variation. The purpose of the original breeding is to eliminate bad variation, the inherent characteristics of good varieties and in the development of good variation, the accumulation of good features, multiply, make it continue to improve and move forward. In short, the original breeding work is anti-degeneration work. Therefore, it not only simply maintain the purity and traits of elite, but through a variety of technical measures to promote improved varieties and enhance high yield performance. Practice has proved that to maintain and improve good seed variety, generally increase yield of 3-20%. In recent years, in the world, rice seed breeding work,