Breeding and Application of Hybrid Late-cropping Rice Guliangyou 6915 with High Quality and Disease Resistance

Guliangyou 6915 is a new two-line hybrid rice variety developed by the Rice Research Institute of Fujian Academy of Agricultural Sciences through the combination of the self-bred two-line sterile line Gu S and the self-bred restorer line Fuhui 6915. It was certified by the National Crop Variety Appraisal Committee in 2022. From 2020 to 2021, it participated in the test of photoperiod-sensitive late indica group of the South China Rice Area Science and Technology Enterprise Rice Consortium. The average whole growth period in the regional test was 117.8 days, which was 0.8 days earlier than that of the control Jifengyou 1002, and the average yield was 7707.90 kg·hm⁻², which was 2.58% higher than that of the control Jifengyou 1002. In the production test, the average whole growth period was 114.8 days, which was 0.2 days later than that of the control Jifengyou 1002, and the average yield was 7792.5 kg·hm⁻², which was 5.10% higher than that of the control Jifengyou 1002. It was moderately resistant (MR) to rice blast, and the rice quality reached the 3rd level of high quality. The average seed production yield over 5 years from 2019 to 2023 reached 3163.86 kg·hm⁻². The breeding process, characteristics, and key points of cultivation and seed production technology of Guliangyou 6915 were introduced, aiming to provide reference for the promotion and application of Gu Liangyou 6915.