Abstract:

High yield and high quality are the key goals of the rice industry, but there is an obvious contradiction between these two traits, and it is very difficult to gather the two traits on the same variety by conventional breeding techniques. Our research team successfully bred an ultra-high-yielding and high-quality early-maturing indica-japonica hybrid rice Zheyou 915 by combining molecular breeding technology with indica-japonica heterosis utilization method. This variety has shown very high yield potential in regional trials and production trials. The quality of rice is in line with the third grade of the ministry standard of edible rice, and the other indicators in the evaluation index are in line with the first grade of the ministry standard except for the alkali elimination value. The whole growth period was 146.5-156.5 days, and it was 0.3-0.9 days earlier than Jiayou 5. In 2023, it will pass the national variety approval and is suitable for promotion and application in southern japonica rice planting areas such as Zhejiang, Shanghai, Anhui, Hubei, and southern Jiangsu. According to the characteristics of Zheyou 915, this paper proposes a key high-yield cultivation technology to improve the effective panicle and increase the number of grains per panicle.

Key words: indica-japonica hybrid rice, breeding, ultra-high yield, high quality, cultivation technology