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Acta Agronomica Sinica ›› 2021, Vol. 47 ›› Issue (11): 2147-2162.doi: 10.3724/SP.J.1006.2021.04271

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

Construction linkage maps and identification of quantitative trait loci associated with important agronomic traits in purple-fleshed sweetpotato

MA Meng(), YAN Hui, GAO Run-Fei, KOU Meng, TANG Wei, WANG Xin, ZHANG Yun-Gang, LI Qiang*()   

  1. Sweetpotato Research Institute, Chinese Academy of Agricultural Sciences / Xuzhou Institute of Agricultural Sciences in Jiangsu Xuhuai District / Key Laboratory of Biology and Genetic Breeding of Sweetpotato, Ministry of Agriculture and Rural Affairs, Xuzhou 221131, Jiangsu, China
  • Received:2020-12-13 Accepted:2021-03-19 Online:2021-11-12 Published:2021-04-12
  • Contact: LI Qiang E-mail:1325428037@qq.com;instrong@163.com
  • Supported by:
    National Key Research and Development Program of China(2019YFD1001300);National Key Research and Development Program of China(2019YFD1001304);China Agriculture Research System(CARS-10, 甘薯)

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Abstract:

Ideal agronomic traits are the important objectives in sweetpotato breeding, but the breeding methods are still lacking. We constructed linkage maps using a mapping population of 274 individuals derived from a cross between the female parent Xuzishu 8 (a purple-fleshed cultivar with many branches, medium vine, and high yield) and the male parent Meiguohong (a white-fleshed cultivar with few branches, long vine, and medium yield) by simple sequence repeats (SSR) markers in this study. The female parent map contained 24 linkage groups, and covered 1325.8 cM with an average marker interval of 9.2 cM. The male parent map contained 21 linkage groups, and covered 1088.6 cM with an average marker interval of 8.2 cM. The maps could increase the density of existing genetic maps. Using the composite interval mapping, we analyzed five important agronomic traits, including branch number, vine diameter, longest vine length, petiole length, and internode length in sweetpotato, thus identified one QTL related to branch number explaining the phenotypic variance of 53.2%, one QTL related to internode diameter explaining the phenotypic variance of 16.7%, two QTLs related to longest vine length explaining the phenotypic variance of 9.5% and 13.7%, two QTLs related to petiole length explaining the phenotypic variance of 8.8% and 11.3%, and five QTLs related to internode length explaining the phenotypic variance of 9.6%-28.1%. The QTLs can be used to develop molecular markers and assist the screening of plants with ideal agronomic traits at early seedling stage, thus improved the efficiency of field selection.

Key words: sweetpotato, the number of branches, vine diameter, the longest vine length, petiole length, internode length, QTLs

Fig. 1

Linkage maps of Xuzishu 8"

Fig. 2

Linkage maps of Meiguohong"

Table 1

Parent values of branch number in sweetpotato and its distribution in F1 population"

年份
Year		 母本(个)
Maternal		 父本(个)
Paternal		 最大值(个)
Max.		 最小值(个)
Min.		 平均值(个)
Mean		 标准差
SD		 偏度
Skewness		 峰度
Kurtosis
2019 14.83 6.67 75.00 7.00 23.00 10.47 1.37 3.29
2020 14.20 8.00 25.80 2.33 11.95 3.70 0.64 1.03
平均Average 14.52 7.33 66.00 6.20 18.14 8.56 2.04 6.41

Fig. 3

Frequency distribution of branch number in F1 population"

Fig. 4

Distribution of QTLs for branch number in genetic linkage map of sweetpotato"

Table 2

Parent values of internode diameter in sweetpotato and their distribution in F1 population"

年份
Year		 母本
Maternal (mm)		 父本
Paternal (mm)		 最大值
Max. (mm)		 最小值
Min. (mm)		 平均值
Mean (mm)		 标准差
SD		 偏度
Skewness		 峰度
Kurtosis
2019 3.93 6.88 7.04 2.52 5.17 0.80 -0.21 0.39
2020 4.19 6.90 7.26 2.80 5.23 0.72 0.06 0.75
平均Average 4.06 6.89 7.19 2.96 5.19 0.72 -0.13 0.54

Fig. 5

Frequency distribution of internode diameter in F1 population"

Fig. 6

Distribution of QTLs for internode diameter in genetic linkage map of sweetpotato"

Table 3

Parent values of the longest vine length in sweetpotato and their distribution in F1 population"

年份
Year		 母本
Maternal (cm)		 父本
Paternal (cm)		 最大值
Max. (cm)		 最小值
Min. (cm)		 平均值
Mean (cm)		 标准差
SD		 偏度
Skewness		 峰度
Kurtosis
2019 178.33 185.00 425.00 75.00 178.09 52.82 0.93 2.41
2020 182.00 195.00 361.00 77.00 172.74 47.83 0.50 0.60
平均Average 180.17 190.00 393.00 75.00 174.68 43.86 0.63 2.20

Fig. 7

Frequency distribution of the longest vine length in F1 population"

Table 4

Mapping QTL for the longest vine length in sweetpotato"

QTL名称
QTL name		 连锁图谱
Linkage group		 QTL位置
QTL location (cM)		 年份
Year		 遗传效应
Genetic effect		 贡献率
R2 (%)
qVLm-1p Meiguohong (2) 5.006 2020 正向Positive 18.0
平均Average 13.7
qVLf-1p Xuzishu 8 (18) 15.775 2019 正向Positive 12.4
平均Average 9.5

Fig. 8

Distribution of QTLs for the longest vine length in genetic linkage map of sweetpotato"

Table 5

Parent values of petiole length in sweetpotato and their distribution in F1 population"

年份
Year		 母本
Maternal (cm)		 父本
Paternal (cm)		 最大值
Max. (cm)		 最小值
Min. (cm)		 平均值
Mean (cm)		 标准差
SD		 偏度
Skewness		 峰度
Kurtosis
2019 14.17 15.48 27.98 5.80 16.74 4.18 0.47 -0.24
2020 17.94 10.92 26.64 8.80 18.60 3.16 -0.05 0.10
平均Average 16.05 13.20 25.24 5.80 17.54 3.38 0.02 -0.14

Fig. 9

Frequency distribution of petiole length in F1 population"

Table 6

Mapping QTL for petiole length in sweetpotato"

QTL名称
QTL name		 连锁图谱
Linkage group		 QTL位置
QTL location (cM)		 年份
Year		 遗传效应
Genetic effect		 贡献率
R2 (%)
qPLf-1p Xuzishu 8 (1) 40.483 2019 正向Positive 6.5
平均Average 11.3
qPLf-2p Xuzishu 8 (18) 41.837 2020 正向Positive 6.5
平均Average 8.8

Fig. 10

Distribution of QTLs for petiole length in genetic linkage map of sweetpotato"

Table 7

Parent values of internode length in sweetpotato and their distribution in F1 population"

年份
Year		 母本
Maternal (cm)		 父本
Paternal (cm)		 最大值
Max. (cm)		 最小值
Min. (cm)		 平均值
Mean (cm)		 标准差
SD		 偏度
Skewness		 峰度
Kurtosis
2019 4.08 3.95 10.35 2.00 4.16 1.45 1.46 2.78
2020 4.98 3.48 9.46 3.10 5.39 1.17 0.63 0.51
平均Average 4.53 3.72 9.55 2.40 4.73 1.23 0.76 1.50

Fig. 11

Frequency distribution of internode length in F1 population"

Table 8

Mapping QTL for internode length in sweetpotato"

QTL名称
QTL name		 连锁图谱
Linkage group		 QTL位置
QTL location (cM)		 年份
Year		 遗传效应
Genetic effect		 贡献率
R2 (%)
qILm-1p Meiguohong (2) 5.006 2020 正向Positive 9.8
平均Average 9.6
qILf-1p Xuzishu 8 (1) 40.483 2019 正向Positive 15.0
平均Average 15.8
qILf-2n Xuzishu 8 (2) 13.470 2019 负向Negative 13.1
平均Average 16.1
qILf-3n Xuzishu 8 (9) 24.405 2019 负向Negative 53.6
平均Average 28.1
qILf-4p Xuzishu 8 (18) 21.380 2019 正向Positive 43.5
平均Average 20.6

Fig. 12

Distribution of QTL for internode length in genetic linkage map of sweetpotato"

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