关键词: 浙江省, 常规早籼稻, 审定, 推广面积, 系谱关系

Abstract:

In order to screen the excellent conventional early indica rice varieties in Zhejiang province in recent years, guide the breeding and application of early indica rice. In this paper, the yield, resistance, rice quality, growth period, grain structure, promotion areas and genetic relationship of 65 conventional early indica rice varieties registered in Zhejiang province during 2001-2015 were compared and analyzed. The results showed that, the cultivars registered during the 12th five year plan period showed a higher plant height, less effective panicles, bigger spike, increased 1 000-grain weight, decreased seed setting rate and delayed growth period compared to the cultivars registered in the 11th and the 10th five-year plan period. All cultivars registered in the three periods showed good resistance to rice blast disease. The number of high quality edible rice cultivars tend to decrease, while that of the processing cultivars tend to increase. The accumulative promoting areas of the 62 cultivars listed in the statistics of Ministry of Agriculture was   9 215 khm2. The cultivars Jiayu 253, Zhou 903 and Zhefu 802 made important contribution to the production. The cultivars registered during the 12th five-year plan period showed problems such as cultivar homogeneity, over-long growth period and small promotion areas. In conclusion, to keep ahead in the conventional early indica rice breeding, Zhejiang province should make more efforts in the germplasm resources creation, continuously adjust breeding aim and increase cultivar popularization.

Key words: Zhejiang province, conventional early indica rice, cultivar registration, promotion areas, genetic relationship