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Acta Agronomica Sinica ›› 2022, Vol. 48 ›› Issue (10): 2427-2434.doi: 10.3724/SP.J.1006.2022.13065

• REVIEW •     Next Articles

Insights on developing modern corn ecological breeding in southwest China

PAN Guang-Tang(), YANG Ke-Cheng, GAO Shi-Bin   

  1. National Key Laboratory for the Exploration and Utilization of Genetic Resources of Crops in Southwest China / Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, Sichuan, China
  • Received:2021-11-15 Accepted:2022-04-24 Online:2022-10-12 Published:2022-05-07
  • Contact: PAN Guang-Tang E-mail:pangt@sicau.edu.cn
  • Supported by:
    China Agriculture Research System of MOF and MARA(CARS-02);Sichuan Science and Technology Support Project(2016NYZ029);Sichuan Science and Technology Support Project(2021YFFZ0017)

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Abstract:

Based on the principle of interaction between genotype and environment (G × E), we analyze the ecological zoning characteristics of maize breeding in southwest China, the development demand of national economy, the development trend of maize industry, the change of breeding target demand, the innovation of breeding technology system and so on. We focus on the systematic summary and explanation of the connotation of maize ecological breeding in southwest China in the new period. Further condensed with “full attention and utilization of (G × E) interaction” as the core, “industrialization of breeding objectives, diversification of variety types, special identification of variety selection, regionalization of variety layout, and collectivization of variety promotion.” the development concept of “modern ecological breeding” in Southwest corn region with the main content of “model of variety cultivation” systematically put forward the breeding goal of “low risk and high efficiency new hybrid” in the new period, which is characterized by “stable yield, high efficiency, environment-friendly, high quality and safety, easy seed production and harvest by machine ”. In order to promote the sustainable and healthy development of maize production and industry in southwest China, we proposed the following aspects should be emphasized in breeding technology system: 1) the path is to improve disease resistance and stress resistance of new varieties based on the premise of fine exploration and accurate identification of excellent and specific breeding resources; 2) the key is to utilize different heterotic groups, especially the cultivation of excellent inbred lines of tropical germplasm groups urgently needed in different ecological regions, and the identification of new hybrid combinations in specific ecological regions under multi-point biotic and abiotic strong stress for multi-year; 3) the guarantee is to popularize new varieties with stable yield, high yield and high efficiency guaranteed by efficient utilization of resources in specific ecological regions, environment-friendly and sustainable development of maize production.

Key words: maize, southwest China, traditional ecological breeding, modern ecological breeding

Fig. 1

The model about three-tier classification of the heterotic groups on maize germplasm in Southwest China"

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