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云南粳稻面积近一千万亩,多为一季中晚粳。尤其滇中北稻区,海拔大部在1800—2200公尺,夏秋气温较低,雨水多,日照少,抽穗扬花期常有低温为害。欲选育适宜该区种植的杂交水稻,并在生产上有利用价值,三系及杂种均需的耐寒、抗病、早熟,杂种应优势强,比推广品种增产20%以上。我们根据这样的气候特点和要求,进行粳稻三系的选育工作。
Yunnan rice area of nearly 10 million mu, mostly for the season of late japonica. In particular, northern Yunnan rice area, most of the elevation of 1800-2200 meters, summer and autumn temperatures are lower, more rain, less sunshine, heading and flowering are often cold damage. To breed hybrid rice suitable for planting in this area, and have the utilization value in production, the cold-resistant, disease-resistant and precocious species needed by the three lines and the hybrids should have stronger advantages and should increase the yield more than 20% than the popularized varieties. According to this climate characteristics and requirements, we carry out the breeding of japonica rice three lines.