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Acta Agronomica Sinica ›› 2026, Vol. 52 ›› Issue (5): 1352-1364.doi: 10.3724/SP.J.1006.2026.53086

• CROP GENETICS & BREEDING·GERMPLASM RESOURCES·MOLECULAR GENETICS • Previous Articles     Next Articles

Genetic diversity analysis of nationally approved maize varieties in different ecological regions

Yang Yang(), Chang Shi-Hui(), Tian Hong-Li(), Yi Hong-Mei, Wang Lu, Ren Jie, Fan Ya-Ming, Liu Ya-Wei, Wang Feng-Ge*(), Zhao Jiu-Ran*()   

  1. Maize Research Institute, Beijing Academy of Agriculture and Forestry Sciences / Key Laboratory of Crop DNA Fingerprinting Innovation and Utilization of the Ministry of Agriculture and Rural Affairs (Co-construction by Ministry and Province) / Beijing Key Laboratory of Maize DNA Fingerprinting and Molecular Breeding, Beijing 100097, China
  • Received:2025-10-31 Accepted:2026-01-22 Online:2026-05-12 Published:2026-02-05
  • Contact: *Zhao Jiu-Ran, E-mail: maizezhao@126.com; Wang Feng-Ge, E-mail: gege0101@163.com
  • About author:First author contact:**Contributed equally to this work
  • Supported by:
    Biological Breeding-National Science and Technology Major Project(2022ZD04019);Science and Technology Innovation Capacity Building Project of BAAFS(KJCX20230303);Beijing Scholars Program(BSP041)

Abstract:

Analyzing the genetic diversity of maize varieties approved at the national level across different ecological regions reveals patterns of genetic differentiation among regional germplasms. This provides a theoretical basis for elite germplasm screening and region-specific variety breeding. In this study, 273 nationally approved common maize varieties were analyzed. Sixteen field phenotypic traits and genetic variation parameters based on 40 SSR markers were statistically evaluated. Cluster analysis and association analysis of phenotypic and genotypic data were conducted to explore the relationships among phenotypes, genotypes, and environmental factors in common maize. The results showed significant differences in growth period and regional trial yield across ecological regions, with F values of 2484.95 and 472.83, respectively. Genetic diversity was relatively high in the Xi-Nan spring-sowing region (XN), with a gene diversity index of 0.72. Phenotypic clustering divided 325 variety records into four groups: Group X1 mainly included varieties from the Dong-Hua-Bei (DHB) and Xi-Bei (XB) spring-sowing regions; Group X2 was dominated by varieties from the Bei-Fang (BF) early-maturity spring-sowing region; Group X3 included varieties from the XN region; and Group X4 mostly comprised varieties from the Huang-Huai-Hai (HHH) summer-sowing and Dong-Nan (DN) spring-sowing regions. Phenotypic differentiation among ecological regions followed clear trends: DHB and XB varieties were characterized by medium-late maturity and tall stalks; BF by early maturity and medium short stalks; XN by medium maturity and medium stalks; and HHH and DN by early maturity and medium stalks. Notably, XN, HHH, and DN regions experienced relatively high disease pressure. Principal component analysis (PCA) of phenotypic traits showed that the first two components explained 69.0% of the total variance, with clear group separation, supporting the validity of the phenotypic classifications. Genotypic clustering also divided the 273 varieties into four groups. In Group Y1, the predominant heterosis patterns were Reid × X and Improved Reid × X; in Group Y2, X × Tangsipingtou (Huangzaosi-derived lines); and in Group Y4, Improved Reid × Tangsipingtou. Genotypic PCA demonstrated a cumulative contribution of 57.9% from the first two components, with clear intra-group cohesion and significant inter-group differentiation, confirming the reliability of the genotypic groupings. Association analysis between genotypes and phenotypes revealed a weak correlation, likely due to the design objectives of molecular marker selection. Maize varieties from different ecological regions in China exhibit distinct regional differentiation in field performance and parental heterosis groups, resulting in a well-defined correspondence among ecological zones, trait expression, and genetic background. This pattern reflects region-specific breeding goals that prioritize yield stability and efficient resource utilization.

Key words: maize, nationally approved varieties, ecological regions, phenotypic data, genotypic data, genetic diversity

Fig. 1

Differences in the statistical distribution of phenotypes of nationally approved maize varieties in different ecological regions A-P represent the statistical distribution of growth period, plant height, ear height, number of leaves, anther color, planting density, ear length, hundred kernel weight, grain yield in regional trials, seed capacity, crude fat content, crude protein content, lysine content, crude starch content, stalk rot resistance and ear rot resistance across different ecological regions. The horizontal axis represents ecological regions. BF: Bei-Fang early-maturity spring-sowing region; DHB: Dong-Hua-Bei spring-sowing region; HHH: Huang-Huai-Hai summer-sowing region; XB: Xi-Bei spring-sowing region; XN: Xi-Nan spring-sowing region; DN: Dong-Nan spring-sowing region. In Figures 1-O and 1-P, vertical axis values 1 to 5 represent highly susceptible, susceptible, moderately resistant, resistant, and highly resistant, respectively."

Table 1

Comparison of genetic variation diversity in nationally approved maize varieties across different ecological regions"

生态区
Ecological region
样本数
Sample number
基因型总数
Total number of
genotypes
等位变异总数
Total number of alleles
基因多样性
Gene
diversity
杂合度
Heterozygosity
(%)
多态性信息含量
PIC
北方早熟春播区
Northern early-maturity spring-sowing region
10 248 219 0.66 68 0.62
东华北春播区
Northeast and North spring-sowing region
108 672 342 0.63 68 0.59
黄淮海夏播区
Huang-Huai-Hai summer-sowing region
103 586 325 0.64 69 0.59
西北春播区
Northwest spring-sowing region
24 337 238 0.61 68 0.57
西南春播区
Southwest spring-sowing region
25 503 327 0.72 67 0.69
东南春播区
Southeast spring-sowing region
3 97 133 0.59 72 0.53

Fig. 2

Cluster analysis of phenotypic data of nationally approved maize varieties A: phylogenetic tree based on phenotypic data; B: principal component analysis based on the Euclidean distance matrix. Branch labels from the innermost to the outer circle represent: ecological region (ER), growth period (C1), plant height (C2), ear height (C3), number of leaves (C4), anther color (C5), planting density (C6), ear length (C7), hundred kernel weight (C8), grain yield in regional trials (C9), seed capacity (C10), crude fat content (C11), crude protein content (C12), lysine content (C13), crude starch content (C14), stalk rot resistance (C15), and ear rot resistance (C16). C: circle. Abbreviations are the same as those given in Fig. 1."

Table 2

Summary of the number of variety records grouped by phenotypic clustering in different ecological regions"

生态区
Ecological region
X1组
Group X1
X2组
Group X2
X3组
Group X3
X4组
Group X4
北方早熟春播区
Northern early-maturity spring-sowing region
9 1
东华北春播区
Northeast and North spring-sowing region
119
黄淮海夏播区
Huang-Huai-Hai summer-sowing region
4 1 118
西北春播区
Northwest spring-sowing region
38
西南春播区
Southwest spring-sowing region
1 27 3
东南春播区
Southeast spring-sowing region
4

Fig. 3

Cluster analysis of genotypic data of nationally approved maize varieties A: phylogenetic tree based on genotypic data; B: principal component analysis based on Rogers’s 1972 distance matrix. Branch labels from the inner circle to the outer circle are: ecological region (ER), parental heterosis group 1 (PG1), parental heterosis group 2 (PG2); the parental heterosis groups include Tangsipingtou, P group, Reid, Improver Reid, X group, Lancaster, Lvda red cob, Mixed 1 and Mixed 2. Abbreviations are the same as those given in Fig. 1."

Table 3

Summary of the number of varieties grouped by genotypic clustering in different ecological regions"

生态区
Ecological region
Y1组
Group Y1
Y2组
Group Y2
Y3组
Group Y3
Y4组
Group Y4
北方早熟春播区
Northern early-maturity spring-sowing region
1 9
东华北春播区
Northeast and North spring-sowing region
75 14 18 1
黄淮海夏播区
Huang-Huai-Hai summer-sowing region
59 20 11 13
西北春播区
Northwest spring-sowing region
19 3 1 1
西南春播区
Southwest spring-sowing region
3 20 2
东南春播区
Southeast spring-sowing region
1 2

Fig. 4

Phylogenetic tanglegram of phenotypic versus genotypic data The left side shows the phylogenetic tree based on phenotypic data, and the right side shows the tree based on genotypic data. Groups X1-X4 are phenotypic clustering groups, and groups Y1-Y4 are genotypic clustering groups."

Fig. 5

Correlation between phenotypic and genotypic data GP: growth period; PH: plant height; EH: ear height; LN: number of leaves; AC: anther color; PD: planting density; EL: ear length; HKW: hundred kernel weight; RGY: grain yield in regional trials; SC: seed capacity; CFC: crude fat content; CPC: crude protein content; LC: lysine content; CSC: crude starch content; SRR: stalk rot resistance; ERR: ear rot resistance. P01-P40 represent the 40 SSR markers of genotypic data."

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