Molecular Improvement of Rice Blast Resistance in a Rice Maintainer Line Ruanhua B Based on MAS
Zhe ZHAO, Yujiang WANG, Jiecai LIANG, Yongzhu LIU, Jiyong ZHOU, Xionghui CHEN, Keqin LIANG, Wuming XIAO
Molecular Improvement of Rice Blast Resistance in a Rice Maintainer Line Ruanhua B Based on MAS
In order to improve blast resistance of the maintainer line Ruanhua B,to carry rice blast resistance genes Pi46 and Pi2 high-quality Indica H281 as the donor parent,Ruanhua B as recurrent parent,using marker-assisted selection(MAS)technology combined with pedigree breeding method,polymerization of two foreign genes with improved maintenance line Ruanhua B resistance,Ruanhua B was carried out on the characteristics of stable strain identification of resistance to rice blast,rice quality analysis,etc.Two BC1F6 populations,two BC2F5 populations and two BC3F4 populations with two homozygous target genes were obtained by backcrossing,multi-generation self-crossing and molecular marker detection.Field naturally induced identification showed that the improved lines of different backcrossing generations were resistant to rice blast.The sterility of backcross generation to sterile lines ranged from 52.7% to 100.0%.Agronomic traits and rice quality analysis showed that the improved lines basically conserved the main agronomic characters and rice quality characteristics of Ruanhua B.The results of SNP gene chip analysis showed that the background response rate of BC1F6 was 74.42%—77.77%,that of BC2F5 was 86.42%—87.75%,and that of BC3F4 was 92.27%—92.59%.Multiple resistance genes can be effectively polymerized by continuous backcross,self-cross and marker-assisted selection techniques to obtain a new maintainer line resistant to rice blast,and achieve rapid molecular improvement of maintainer line Ruanhua B.
Rice / Maintainer line / Rice blast / Molecular marker-assisted selection / Rice quality / Genetic background {{custom_keyword}} /
Tab.1 Information of molecular markers RM224 and Pi2-23表1 分子标记RM224与Pi2-23的相关信息 |
引物名称 Marker | 类型 Marker type | 染色体 Chromosome | 正向引物序列(5'—3') Forward primer sequence(5'—3') | 反向引物序列(5'—3') Reverse primer sequence(5'—3') | 退火温度/℃ Annealing temperature | 分离方法 Separation |
---|---|---|---|---|---|---|
RM224 | SSR | 11 | ATCGATCGATCTTCACGAGG | TGCTATAAAAGGCATTCGGG | 56 | 8% PAGE |
Pi2-23 | InDel | 6 | CGGTAAGAGTAACACCAAGC | GACGTGCGAGTTGTGACAGCT | 56 | 8% PAGE |
Tab.2 Results of R genes Pi46 and Pi2 in different populations by MAS表2 不同世代抗性基因Pi46与Pi2的分子标记选择结果 |
株系 Lines | 株数 No. of plants | Pi46 | Pi2 | 双基因杂合单株 Plants with two heterozygous R genes | 双基因纯合单株 Plants with two homozygous R genes | ||||
---|---|---|---|---|---|---|---|---|---|
+ | - | H | + | - | H | ||||
BC1F1 | 86 | — | 42 | 44 | — | 45 | 41 | 21 | — |
BC2F1 | 72 | — | 38 | 34 | — | 37 | 35 | 17 | — |
BC3F1 | 67 | — | 32 | 35 | — | 33 | 34 | 15 | — |
BC1F2 | 104 | 28 | 54 | 22 | 24 | 52 | 28 | 25 | 7 |
BC2F2 | 125 | 27 | 68 | 30 | 30 | 66 | 29 | 30 | 8 |
BC3F2 | 216 | 52 | 116 | 48 | 56 | 115 | 45 | 56 | 14 |
注:+.阳性纯合基因型;-.表示阴性纯合基因型;H.杂合基因型;R.抗性。 | |
Note:+.Positive homozygous genotype;-.Negative homozygous genotype;H.Sheterozygous genotype;R.Resistance. |
Tab.3 Number of polymorphic SNPs on each chromosome between two parents表3 两亲本各染色体上的多态性 SNP 数目 |
染色体 Chromosome | 多态性标记数 Number of polymorphic markers |
---|---|
1 | 331 |
2 | 386 |
3 | 414 |
4 | 407 |
5 | 183 |
6 | 167 |
7 | 897 |
8 | 394 |
9 | 108 |
10 | 782 |
11 | 479 |
12 | 771 |
Tab.4 The percentage of genome recovery of the six improved lines by SNP chip %表4 6个改良系的背景回复率 |
株系 Lines | 受体背景 回复率 RP genome | 理论背景 回复率 Theoretical recovery rate | 供体背景 回复率 DP genome | 杂合度 Residual heterozygosity |
---|---|---|---|---|
L1 | 77.77 | 75.00 | 19.04 | 3.19 |
L2 | 74.42 | 75.00 | 21.91 | 3.67 |
L3 | 87.75 | 87.50 | 7.78 | 4.47 |
L4 | 86.42 | 87.50 | 8.83 | 4.75 |
L5 | 92.59 | 93.75 | 2.32 | 5.09 |
L6 | 92.27 | 93.75 | 2.47 | 5.26 |
平均值Mean | 84.77 | 85.42 | 10.39 | 4.41 |
注:RP.轮回亲本;DP.受体亲本。 | |
Note:RP.Recurrent parent;DP.Donor parent. |
Fig.2 Genetic structures of the six improved lines analyzed by Rice20K SNP microarrayWhite.Indicating the same as the RP;Light green.The same as the DP;Dark red.The heterozygous sites.Black and blue dots.Location of Pi2 and Pi46 on chromosome 6 and 11,respectively.图2 6个改良株系的RICE20K 遗传背景图 白色.与受体皆相同;浅绿色.与供体相同;深红色.杂合位点;黑色圆点.Pi2在6号染色体上的位置;蓝色圆点.Pi46在11号染色体上的位置。 |
Tab.5 Results of rice blast resistance under the field condition表5 自然苗圃下的稻瘟病抗性鉴定结果 |
株系 Lines | 叶瘟等级 Rating of infected leaves | 穗瘟等级 Rating of infected panicles | 抗病等级 Rating of resistance level |
---|---|---|---|
软华B | 8 | 9 | 高感 |
Ruanhua B | |||
H281 | 3 | 3 | 抗 |
L1 | 3 | 5 | 抗 |
L2 | 3 | 5 | 抗 |
L3 | 3 | 5 | 抗 |
L4 | 3 | 3 | 抗 |
L5 | 3 | 3 | 抗 |
L6 | 3 | 3 | 抗 |
Tab.6 Results of sterility pollen rate and self-setting rate of F1 plants derived from improved lines表6 各改良株系对应不育系的不育花粉率及自交结实率 |
编号株系 Lines | 不育花粉率/% Sterility pollen rate | 自交结实率/% Self-setting rate | 不育等级 Rating of sterility |
---|---|---|---|
L1 | 52.7±0.18c | 32.3±0.33b | 部分不育 |
L2 | 67.3±0.19bc | 29.7±0.17bc | 部分不育 |
L3 | 78.0±0.23b | 21.7±0.26c | 部分不育 |
L4 | 100.0±0.17a | 0.0±0.41a | 全不育 |
L5 | 100.0±0.08a | 0.0±0.27a | 全不育 |
L6 | 100.0±0.14a | 0.0±0.34a | 全不育 |
注:同一列平均值±标准差后的小写字母表示在 5% 水平上差异显著。 | |
Note:Different lowercase letters after the mean ±s in the same column show significantly different at 5%.The same as |
Tab.7 Main agronomic characters of the improved lines表7 改良株系的主要农艺性状 |
株系 Lines | 株高/cm Plant Height | 剑叶长/cm Flag-leaf length | 剑叶宽/cm Flag-leaf width | 单株穗质量/g Panicle weight per plant | 有效穗数/ (穗/株) Panicle number | 穗长/cm Panicle length | 粒长/cm Grain length | 粒宽/cm Grain width | 谷粒长宽比 Grain length to width ratio | 千粒质量/g TGW |
---|---|---|---|---|---|---|---|---|---|---|
软华B Ruanhua B | 117.00±3.20a | 57.80±0.17a | 2.13±0.25a | 25.47±2.65b | 7.33±1.15c | 22.58±2.18bc | 9.73±0.10ab | 2.22±0.41b | 4.39±0.14a | 21.57±2.18b |
H281 | 108.13±6.18b | 38.60±7.43d | 1.72±0.10b | 27.17±4.36ab | 9.67±1.73a | 23.55±0.43ab | 9.23±0.11c | 2.69±0.26a | 4.03±0.04b | 23.55±0.43a |
L1 | 109.67±3.05b | 52.80±7.71b | 1.93±0.23ab | 28.39±10.29a | 8.33±2.31b | 24.84±0.75a | 10.09±0.16a | 2.52±0.04ab | 4.00±0.02b | 22.84±0.75ab |
L2 | 107.07±1.01b | 50.47±3.10ab | 2.05±0.06a | 27.37±5.45ab | 8.00±1.73b | 22.41±0.98bc | 9.39±0.12bc | 2.65±0.35a | 3.55±0.09c | 22.41±0.98ab |
L3 | 103.33±1.52c | 51.23±1.62b | 1.83±0.12b | 24.77±3.10b | 7.33±0.58c | 22.90±1.41ab | 10.15±0.48a | 2.45±0.07ab | 4.15±0.27ab | 22.90±1.41ab |
L4 | 108.57±2.29b | 47.50±4.68c | 1.94±0.15ab | 23.17±3.96b | 8.67±1.52b | 21.92±1.08c | 9.30±0.06bc | 2.58±0.57ab | 4.00±0.12b | 21.92±1.08b |
L5 | 116.75±0.17a | 39.30±4.80d | 2.05±0.07a | 28.75±0.78a | 9.00±1.41ab | 21.76±0.72c | 9.69±0.09b | 2.35±0.49b | 4.12±0.06ab | 21.76±0.72b |
L6 | 110.75±1.76b | 39.95±3.89d | 1.98±0.13ab | 23.84±2.05b | 8.00±1.41b | 23.01±0.55b | 9.79±0.11ab | 2.35±0.49b | 4.16±0.04ab | 22.01±0.55b |
Tab.8 Rice quality parameters of improved lines表8 改良株系的稻米品质分析 |
株系 Strain | 糙米率/% Brown rice rate | 精米率/% Milled rice rate | 整精米率/% Head milled rice rate | 垩白度/% Chalkiness degree | 垩白粒率/% Chalky rice rate | 直链淀粉含量/% Amylose content | 胶稠度/mm Gel consistency | 糊化温度/℃ Gelatinization temperature |
---|---|---|---|---|---|---|---|---|
软华B Ruanhua B | 78.69±0.47ab | 75.83±8.79a | 68.11±3.81a | 0.94±0.19bc | 0.87±0.33c | 14.28±0.37c | 78.66±1.57a | 79.61±1.27ab |
H281 | 76.00±1.09c | 73.11±1.44c | 65.77±7.03b | 1.54±0.80ab | 1.42±0.58a | 16.06±0.51a | 73.17±2.02bc | 76.88±2.53bc |
L1 | 77.62±0.31b | 73.70±3.08bc | 63.39±1.87bc | 1.37±0.31b | 1.33±0.88ab | 15.87±0.20ab | 71.12±1.53c | 76.51±1.98c |
L2 | 77.91±3.95b | 75.73±7.95a | 57.95±4.03c | 1.66±0.08a | 1.47±0.57a | 15.57±0.33ab | 72.26±1.27bc | 78.88±2.12b |
L3 | 79.16±4.81a | 75.71±2.60a | 58.23±2.53c | 0.89±0.34c | 1.05±0.34b | 15.17±0.44b | 75.32±3.12b | 77.61±2.32bc |
L4 | 76.29±2.81bc | 74.28±1.04b | 57.67±2.26c | 1.11±0.10bc | 1.00±0.58b | 15.27±0.39b | 75.23±2.11b | 79.91±2.41a |
L5 | 76.51±4.31bc | 73.27±2.87c | 67.28±5.67ab | 1.04±0.65bc | 1.35±0.05ab | 14.76±0.32bc | 77.33±1.33ab | 80.16±1.75a |
L6 | 75.98±3.30c | 73.83±3.14bc | 64.58±1.73bc | 0.97±0.23bc | 0.91±0.11bc | 15.47±0.25ab | 74.47±1.04bc | 79.12±2.53ab |
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