Objectives A new blast-resistant lines of rice suitable for cultivation in Fujian province was generated with an efficient breeding method.
Methods Applying the EMS chemical mutagenesis, Hang 2 with excellent agronomic traits except blast-resistance was selected to breed a hybrid restorer line through directional cultivations in areas with varied ecological conditions. Disease-resistance of the lines was verified to finalize the process and hybrid selection.
Results The hybrid Indica restorer line, Fuhui 7076, not only inherited the desirable agronomic traits of Hang 2, such as wide compatibility, strong resilience, and high combining ability, but also performed superior on the quality and yield as well as an MR (medium resistance) rating on blast. Utilizing Fuhui 7076 to cross with Ganxiang A, Ganyou 7076 gave a 2-year average yield of 10,711.5 kg/hectare at the 2015 and 2016 Yunnan Provincial Indica Hybrid Rice Trials. The yield was 3.24%, and the rate of increase 68.42%, higher than control, F You 498. In 2017 , Ganyou 7076 was certified by the Crop Certification Committee of Yunnan Province (Certificate No. 2017009).
Conclusions With the EMS chemical mutagenesis, the agronomically desirable Hang 2 was bred to be blast-resistant. Through years of continued directional selection in blast-prone rice farming regions of varied ecosystems, the time required for natural mutation process was significantly shortened in the breeding of the disease-resistant variety.
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