Abstract:

The study aims to breed a new japonica rice variety with high yield, good quality, and multi-resistance suitable for planting in the Huang-Huai rice region. Using ‘Jindao 1007’ as the female parent and ‘Shengdao 18’ as the male parent, a cross was made and pedigree selection was performed. The yield, quality, and resistance traits of ‘Jirudao 1’ were systematically evaluated through multi-year and multi-location trials. In the Shandong Provincial regional trials from 2019 to 2021, ‘Jirudao 1’ achieved an average yield of 10437 kg/hm², which was 8.1% higher than the control variety ‘Lindao 10’. In the production trial, the average yield of ‘Jirudao 1’ was 9129 kg/hm², representing a 9.4% increase over the control. The rice quality of ‘Jirudao 1’ showed a brown rice rate of 84.6%, head milled rice rate of 67.8%, chalkiness degree of 4.0%, amylose content of 15.7%, gel consistency of 73 mm, and alkali spreading value of 6.5; its main quality indicators reached the Grade 3 standard for high-quality paddy issued by the Ministry of Agriculture and Rural Affairs, and it was recognized as a superior taste variety by Jiangsu Province in 2023. KASP marker detection confirmed the presence of blast resistance genes pi35 and Pita. It also exhibited good resistance to rice stripe virus disease, bacterial blight, and sheath blight. ‘Jirudao 1’ achieves coordinated improvement in high yield, good quality, and multi-resistance, making it suitable for popularization and cultivation in the Huang-Huai rice region

Key words: japonica rice, ‘Jirudao 1’, variety breeding, pedigree selection, rice quality, disease resistance