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我国五十年代育成的矮秆籼稻,就株型而言,当时在世界上是领先的.继之,1962年国际水稻研究所育成了IR_8,它的株型经该所前任所长Chandler总结,引起了育种家的重视.目前,一般仍认为IR_8的株型是一个比较理想的株型.在丰产栽培条件下,它的叶面积系数可达11以上.东南亚报导,认为它没有最适叶面积.以后,国际水稻所的水稻育种基本上是以此株型为基础的.粳稻育种,我国和日本、朝鲜、西班牙均取得了良好成果,但就生产潜力而言,尚不及IR_8、IR_(24)、IR_(661)等品种.看来,目前粳稻的株型是一个突出的限制因素.
In the 1950s, the dwarf indica rice bred in our country was the leading one in the world in terms of plant type.After that, the International Rice Research Institute (IRRI) bred IR_8 in 1962. Its plant type was summarized by Chandler, former director of the institute, Has attracted the attention of breeders.At present, it is generally still believed that the plant type of IR_8 is an ideal plant type.It has a leaf area coefficient of more than 11 under high yield cultivation conditions.A Southeast Asia reported that it does not have the optimum leaf area Since then, rice breeding by the International Rice Research Institute has basically been based on this type of plant type. Japonica rice breeding has yielded good results in China, Japan, North Korea and Spain, but it is still below the production potential of IR_8 and IR_24 ), IR_ (661), etc. It seems that the current plant type of japonica is a prominent limiting factor.