Molecular Breeding of Zheyou810, an Indica–Japonica Hybrid Rice Variety with Superior Quality and High Yield

Jian Song, Yongtao Cui, Honghuan Fan, Liqun Tang and Jianjun Wang ()
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Jian Song: Zhejiang Academy of Agricultural Sciences, Hangzhou 310022, China
Yongtao Cui: Zhejiang Academy of Agricultural Sciences, Hangzhou 310022, China
Honghuan Fan: Zhejiang Academy of Agricultural Sciences, Hangzhou 310022, China
Liqun Tang: Zhejiang Academy of Agricultural Sciences, Hangzhou 310022, China
Jianjun Wang: Zhejiang Academy of Agricultural Sciences, Hangzhou 310022, China

Agriculture, 2023, vol. 13, issue 9, 1-11

Abstract: Rice heterosis has played a significant role in improving rice yields in China since the 1970s. The utilization of heterosis between the indica and japonica subspecies of rice is especially important in this regard. However, inter-subspecies hybridization between indica and japonica rice is hampered by the inadequate seed-setting rate and inferior rice quality of hybrid offspring, which has limited its development. The discovery and cloning of wide-compatibility gene S5-n and the granular starch synthase gene Wx have provided a solution to this problem, paving the way for the breeding of inter-subspecies hybrid rice. Here we demonstrated the breeding process of Zheyou810 and its performances in regional trials. Employing marker-assisted selection through the utilization of KASP (Kompetitive Allele-Specific PCR), a high-yielding and superior-quality indica–japonica hybrid rice variety named Zheyou810 was developed. Zheyou810 achieved an average yield of 10,737.75 kg/ha (12.58% higher than control Jiayou5) in the national regional trials across 2019 and 2020, and 11,777.25 kg/ha (13.36% higher than Jiayou5) in the production trial in 2020, respectively. The quality of rice has also been improved, reaching the standards set by the Ministry of Agriculture of the People’s Republic of China for Grade 3 premium rice (NY/T593). In 2021, Zheyou810 was approved by the national examination showing broad application prospects.

Keywords: indica–japonica hybrid rice; quality; yield; marker-assisted selection; molecular breeding; KASP marker (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2023
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