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Acta Agronomica Sinica ›› 2021, Vol. 47 ›› Issue (3): 462-471.doi: 10.3724/SP.J.1006.2021.04034

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

QTL mapping of salt and drought tolerance related traits in Brassica napus L.

MENG Jiang-Yu(), LIANG Guang-Wei, HE Ya-Jun*(), QIAN Wei   

  1. College of Agronomy and Biotechnology, Southwest University, Chongqing 400716, China
  • Received:2020-02-16 Accepted:2020-10-14 Online:2021-03-12 Published:2020-11-18
  • Contact: HE Ya-Jun E-mail:1131241810@qq.com;hyj790124@163.com
  • Supported by:
    National Key Research and Development Program of China(2016YFD0100202);National Natural Science Foundation of China(31671729);Chongqing Research Program of Basic Research and Frontier Technology(cstc2017jcyjAX0391)

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Abstract:

Salt and drought stresses are main abiotic stresses affecting crop yield. Detecting the QTLs related to salt and drought tolerance can provide theoretical basis for stress resistance breeding in rapeseed. In this study, a doubled haploid population (DH population), which included 261 lines constructed using the German winter rapeseed cultivar ‘Express’ (female) and the Chinese semi-winter line ‘SWU07’ (male), were used to detect QTLs related to salt and drought tolerance. The seeds were germinated in Petri dishes under 1.2% NaCl and 20% PEG-6000, respectively. The control was under the sterile dH2O. Three tolerance related traits, root length, fresh weight and germination rate of each line were measured on the 7th day after planting. The relative value of root length, fresh weight and germination rate under the salt and drought tolerance condition were calculated. Composite interval mapping (CIM) was used to identify the related QTLs according to the constructed genetic map. A total of 12 QTLs were detected for salt tolerance related traits and located on A02, A03, A05, A09, C01, and C09 chromosome, explaining phenotypic variation ranging from 3.61% to 10.59%. Five of these QTLs were persistently expressed in different repetitions. A total of 9 QTLs were detected for drought tolerance related traits and located on A01, A02, A03, A05, A09, A10, and C03 chromosome, explaining phenotypic variation ranging from 3.94% to 12.90%. Two of these QTLs were persistently expressed in different repetitions. In addition, the overlapped QTLs, located on A02 and A03, were detected under salt stress and drought stress. These results provide more genetic information for improving salt and drought tolerance in rapeseed.

Key words: Brassica napus L., salt tolerance, drought tolerance, QTL

Table 1

Phenotypic analysis under different stress environments in parents and the DH population"

胁迫环境
Stress environment		 性状
Trait		 亲本 Parent DH群体 DH population
SWU07 表达
Express		 Pt-test 最小值
Min.		 最大值
Max.		 平均值
Mean		 标准差
SD		 变异系数
CV (%)
1.2% NaCl 发芽率 Germination rate 0.036 0.173 0 0 0.590 0.151 0.130 86.333
根长 Root length 0.046 0.032 0.007 0.019 0.313 0.082 0.048 58.970
鲜重 Fresh weight 0.155 0.184 0.028 0.119 0.773 0.272 0.104 38.206
20% PEG-6000 发芽率 Germination rate 0.894 0.959 0.017 0.120 0.980 0.845 0.172 20.377
根长 Root length 0.402 0.694 0 0.242 0.995 0.583 0.157 26.840
鲜重 Fresh weight 0.960 0.744 0.001 0.304 0.993 0.744 0.162 21.824

Fig. 1

Phenotype frequency distribution of salt tolerance related traits in DH population Figures a, b, and c show the frequency distribution of relative value of germination rate, relative value of root length, and relative value of fresh weight under salt stress, respectively."

Fig. 2

Phenotype frequency distribution of drought tolerance related traits in DH population Figures a, b, and c show the frequency distribution of relative value of germination rate, relative value of root length, and relative value of fresh weight under drought stress, respectively."

Table 2

Correlation analysis of different traits in the DH population"


 性状
Trait		 1.2% NaCl 20% PEG-6000
SGR SRL SFW DGR DRL DFW
1.2% NaCl SGR
SRL 0.2564**
SFW 0.1317* 0.4273**
20% PEG-6000 DGR 0.0439 0.1294 0.1817*
DRL 0.0559 0.0166 0.1267 0.3238**
DFW -0.0433 0.0032 0.1729* 0.4494** 0.2656**

Table 3

Putative QTLs for salt and drought tolerance-related traits detected in DH population"

胁迫环境
Stress
environment		 性状
Trait		 重复
Repetition		 QTL名称
QTL name		 染色体
Chr.		 位置
Position		 加性效应
Additive		 贡献率
R2 (%)		 LOD 值
LOD score		 置信区间
Confidence
interval
1.2% NaCl 发芽率 Germination rate REP1 qSGR-A03-1 A03 27.11 -0.03 7.06 4.13 22.1-32.0
REP1 qSGR-A03-2 A03 35.61 -0.03 4.46 3.07 33.4-38.3
REP1 qSGR-A05 A05 45.11 0.03 3.61 2.53 40.1-52.0
REP1 qSGR-C01-1 C01 37.01 0.04 10.40 4.72 36.0-37.4
REP1 qSGR-C09 C09 8.50 -0.03 3.74 2.61 5.0-16.4
REP 3 qSGR-A03-3 A03 27.11 -0.04 9.37 5.47 22.7-32.0
REP 3 qSGR-A03-4 A03 35.61 -0.03 5.62 3.82 33.4-39.1
REP 3 qSGR-C01-2 C01 37.01 0.04 10.59 4.75 36.0-39.1
根长
Root length		 REP 1 qSRL-A03-1 A03 28.81 -0.01 5.14 3.44 22.3-32.0
REP 1 qSRL-A03-2 A03 35.61 -0.01 3.78 2.50 33.4-39.1
REP 1 qSRL-A09 A09 86.41 -0.01 8.53 5.03 77.8-95.0
REP 1 qSRL-C09-1 C09 7.91 -0.01 6.61 4.31 3.5-11.9
REP 1 qSRL-C09-2 C09 14.91 -0.01 4.99 3.06 11.9-17.5
REP 2 qSRL-C09-3 C09 7.91 -0.03 4.14 2.52 3.0-17.4
REP 3 qSRL-A03-3 A03 30.81 0.26 6.30 3.44 28.4-33.4
鲜重
Fresh weight		 REP 2 qSFW-C09 C09 19.61 0.00 4.64 2.94 17.5-31.8
REP 3 qSFW-A02 A02 46.00 -0.03 5.79 3.52 44.9-50.0
20% PEG-6000 发芽率 Germination rate REP 1 qDGR-A02 A02 47.00 -0.01 4.41 2.57 44.9-51.0
REP 1 qDGR-A03 A03 35.60 0.01 5.45 3.40 33.4-37.0
REP 1 qDGR-A05-1 A05 65.00 0.04 6.05 3.00 59.0-78.6
REP 2 qDGR-A05-2 A05 66.11 0.04 4.90 3.28 59.3-78.1
根长
Root length		 REP 1 qDRL-A02 A02 40.80 0.04 12.90 2.96 40.2-42.1
REP 3 qDRL-A01 A01 10.31 0.16 4.92 2.98 7.9-12.7
REP 3 qDRL-A10 A10 0.51 0.16 4.32 2.62 0-2.7
鲜重
Fresh weight		 REP 1 qDFW-A09 A09 73.41 0.00 7.11 4.43 72.2-74.7
REP 2 qDFW-A01-1 A01 25.50 0.07 3.94 2.51 15.6-37.1
REP 2 qDFW-C03 C03 25.60 -0.06 9.21 3.87 21.4-34.1
REP 3 qDFW-A01-2 A01 25.51 0.07 3.97 2.53 15.6-37.1

Fig. 3

Distribution of salt and drought tolerance-related QTLs detected in DH population on linkage groups The white-filled block diagrams represent the QTLs detected under salt stress and the black-filled block diagrams represent the QTLs detected under drought stress."

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