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Journal of Agriculture ›› 2022, Vol. 12 ›› Issue (10): 6-9.doi: 10.11923/j.issn.2095-4050.cjas2021-0066

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Maize Hybrid Variety ‘Jiyu 228’: Breeding and the New Heterosis Pattern

SONG Wei(), WANG Liwei, ZHANG Quanguo, LI Ronggai, ZHANG Dongmin, WANG Baoqiang, GUO Rui, SONG Liang, WEI Jianfeng, LI Xinghua, GAO Zengyu, ZHANG Wenying, WANG Jianghao()   

  1. Institute of Cereal and Oil Crops of Hebei Academy of Agriculture and Forestry Sciences, Key Laboratory of Crop Genetics and Breeding of Hebei Province, Shijiazhuang 050035, Hebei, China
  • Received:2021-04-14 Revised:2021-08-13 Online:2022-10-20 Published:2023-01-05
  • Contact: WANG Jianghao E-mail:sw1717@126.com;jhw78@163.com

Abstract:

The aim is to breed maize varieties with high and stable yield and lodging resistant. ‘Huangrui’ was used as the basic breeding material in this study. ‘Huangrui’ possesses American germplasm with strong stem and high-planting dense tolerance, and has extensive adaptability in Huang-Huai-Hai Area. The high-planting density, large population, and combination of test and selection were used to select the two elite inbred lines‘Ji42’ and‘Ji1877’, then the new hybrid variety ‘Jiyu228’ was successfully selected by crossing the two inbred lines. In the 2-year multiple regional tests, the average yield of ‘Jiyu228’ was 9778.5 kg/hm2, which was 6.38% higher than that of the control. In the production tests, the yield of ‘Jiyu228’ was 9114.0 kg/hm2, which was 5.8% higher than that of the control. 83.75% of the test sites showed yield increasing. Meanwhile, the average lodging rate was only 2.3% in the multiple regional tests and 2.8% in the production tests, respectively. In 2019, ‘Jiyu228’ was approved by the National Crop Variety Approval Committee of China for the summer maize cultivar registration in the Huang-Huai-Hai Area. In conclusion, ‘Jiyu228’ integrates the advantages of American germplasm with strong stem and lodging resistance and Chinese germplasm with wide adaptation, and it also has the characteristics of good yield and high-density tolerance. Meanwhile, this study proposes a new heterosis pattern of maize variety breeding.

Key words: maize, hybrid variety, ‘Jiyu228’, breeding, heterosis pattern

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