Scientia Agricultura Sinica ›› 2023, Vol. 56 ›› Issue (3): 405-415.doi: 10.3864/j.issn.0578-1752.2023.03.001


Breeding and Application of a New Thermo-Tolerance Rice Germplasm R203

LIU Gang1(), XIA KuaiFei2, WU Yan1, ZHANG MingYong2, ZHANG ZaiJun1, YANG JinSong1, QIU DongFeng1()   

  1. 1Food Crop Institute, Hubei Academy of Agricultural Sciences/Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Wuhan 430064
    2South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650
  • Received:2022-09-08 Accepted:2022-11-08 Online:2023-02-01 Published:2023-02-14
  • Contact: QIU DongFeng;


【Objective】 The global warming has led to the increasingly serious heat damage on the heading and flowering stage of rice. To reduce the impact of heat damage on rice production and to ensure food security in China and even the world, new rice germplasms with thermo-tolerance on heading stage should be identified and new thermo-tolerance varieties need be bred. 【Method】Guanghui 128 (Qiguizao/Ce64//Minghui 63) was used as the heat resistant parent, through hybridization, multiple crossing and pedigree selection, the lines with high seed setting rate and small variation on heading and flowering stage during the high temperature were screened out for several generations’ breeding process. Then the selected higher generation lines were identified to create new thermos-tolerance rice germplasms in artificial climate chamber (The treated plants will be moved into the chamber on the flowering day, high temperature treatment is 9:00-15:00, 38℃, 15:01-8:59 28℃, the relative humidity is 75%, and the treatment lasts for 7 days), with analysis of agronomic trait. 【Result】The new germplasm R203 has stronger thermo-tolerance and higher seed setting rates under both normal and high temperature conditions (94.5% at normal temperature, 81.9% at high temperature, and 86.7% at relative). Its agronomic traits, quality and comprehensive resistance all meet the production standards. Above all, R203 has the potential to breed new thermos-tolerance hybrid rice varieties. The seed setting rates of 7 hybrid combinations with R203 as the male parent and seven three-line male sterile lines as the female parent were between 83.4%-99.4% under natural high temperature conditions. Among them, Taiyou 203, a new three-line medium indica hybrid rice has good qualities, the seed setting rate was 87.9%, the comprehensive relative heat resistance coefficient was 1.11, and the heat resistance reached level 1. In the production test, the yield increased by 5.36% compared with the control, and the yield increase point accounted for 85.71%. It has good high and stable yield, and the rice quality reached the second level of the ministerial standard. Thus Taiyou 203 has good promotion and application value. 【Conclusion】Currently, basic research on heat resistance is not enough to support the breeding of new practical heat resistant varieties, the rice resources in areas prone to high temperature and humidity are preferred as materials for breeding new heat tolerance lines, a new heat-resistant rice variety R203 was created by phenotypic selection, and a practical heat-resistant rice variety Taiyou 203 was developed by using heterosis.

Key words: rice, thermo-tolerance, germplasm enhancement, evaluation of germplasm

Fig. 1

Pedigree of R203"

Table 1

Yield and yield related traits of the hybrid combination of R203 and different male sterile lines"

Name of combination
Effective panicle number (万/hm2)
<BOLD>S</BOLD>pikelets per panicle
Seed setting rate (%)
Thousand grain weight (g)
Yield per plant
Theoretical yield (t·hm-2)
1 641A×R203 264 290.59 82.47 20.80 44.30 13.16**
2 泰优203 Taiyou203 264 175.76 89.03 23.80 33.20 9.83**
3 1803A×R203 252 170.63 89.44 25.50 32.70 9.81**
4 2280A×R203 255 206.49 89.04 20.80 33.10 9.75**
5 扬籼9A×R203 Yangxian9 A×R203 249 181.45 84.38 25.30 32.90 9.64**
6 663A×R203 279 190.99 77.44 23.00 32.10 9.49**
7 泰香A×R203 Taixiang A×R203 276 200.35 83.11 20.30 31.70 9.33*
8 1070A×R203 276 157.70 90.24 23.60 31.40 9.27*
9 丰两优四号 Fengliangyousihao 270 144.17 83.58 27.60 26.60 8.98
10 平A×R203 Ping A×R203 294 146.33 81.59 25.30 30.10 8.88
11 282A×R203 255 190.32 81.10 21.20 28.10 8.34**
12 畅A×R203 Chang A×R203 216 181.46 84.40 24.90 28.00 8.24**
13 2361A×R203 315 149.98 86.12 19.80 26.90 8.06**
14 229A×R203 246 190.94 85.28 19.80 32.50 7.93**
15 1511A×R203 276 141.79 83.15 24.10 26.90 7.84**
16 广福A×R203 Guangfu A×R203 225 187.56 78.66 23.60 26.80 7.83**
17 667A×R203 231 190.32 76.77 23.00 26.40 7.76**
18 沪旱7A×R203 Huhan7 A×R203 276 138.73 84.95 23.60 25.90 7.68**

Table 2

List of partial functional genes in R203"

Order No.
Representative cultivar
1 Gn1a 产量 Yield 1 9311 每穗粒数增加 Increased grains per spike
2 OsSPL16 产量 Yield 8 HJX74 高产 High yield
3 SKC1 抗非生物逆境 Anti abiotic stress 1 Nona Bokra 耐盐 Salt tolerance
4 NRT1.1B 抗非生物逆境 Anti abiotic stress 10 9311 增强氮吸收 Enhanced nitrogen absorption
5 Rymv1 抗生物逆境 Anti biotic stress 4 日本晴
Resistance to yellow mottle virus disease
6 STV11 抗生物逆境 Anti biotic stress 11 Kasalath 抗水稻条叶枯病毒 Resistance to rice stripe virus
7 Pi5 抗生物逆境 Anti Biotic Stress 9 抗稻瘟病 Resistance to rice blast
8 Pia 抗生物逆境 Anti biotic stress 11 抗稻瘟病 Resistance to rice blast
9 Pid2 抗生物逆境 Anti biotic stress 6 抗稻瘟病 Resistance to rice blast
10 Pid3 抗生物逆境 Anti biotic stress 6 抗稻瘟病 Resistance to rice blast
11 Xa21 抗生物逆境 Anti biotic stress 11 抗白叶枯 Resistance to rice bacterial blight
12 OsAAP6 品质 Quality 1 9311 高蛋白 High protein
13 GW2 品质 Quality 2 Oochikara 大粒 Large grain
14 GS3/TT2 品质 Quality 3 明恢63 Minghui63 长粒、耐热 Long grain, thermos-tolerance
15 OsCYP704A3 品质 Quality 4 IR 24 长粒 Long grain
16 Chalk5 品质 Quality 5 H94 垩白度低,高质量 Low chalkiness, Good quality
17 Waxy 品质 Quality 6 日本晴
In case of non waxy, increase the content of amylopectin
18 ALK 品质 Quality 6 明恢 63
Increase the content of medium long amylopectin and gelatinization temperature
29 Os01g62780 生育期 Heading date 1 Haplotype B 延迟抽穗 Delayed heading
20 Hd17 生育期 Heading date 6 Koshihikari 延迟开花 Delayed flowering
21 Hd3a 生育期 Heading date 6 日本晴
Photoperiod sensitivity
22 S5 育性 Fertility 6 珍汕97 Zhenshan97 广亲和(籼稻亲和) Wide-compatibility
23 qNGR9 株型 Plant type 9 O. rufipogon 直穗 Erect panicle
24 TAC1 株型 Plant type 9 IR24 分蘖角度增大 Increased tillering angle
25 sh4 其他 Other type 4 日本晴 Nipponbare 非落粒 Non seed shattering

Fig. 2

Seed setting of different hybrid combinations under high temperature in 2022 A: 1070A×R203; B: Ken2001S×R203; C: EK2S×R203; D: N25S×R203; E: Taixiang A×R203; F: Yexiang A×R203; G: Taiyou203; H: Taifeng A×Yuanhui 236 (CK)"

Table 3

Heading date and seed setting rate under high temperature of different hybrid combinations in 2022"

Field No.
Name of combination
Initial heading stage (M/D)
Full heading stage (M/D)
Seed setting rate
1 220038 1070A×R203 7/26 8/2 88.32
2 220148 1070A×R18 7/26 7/31 65.11
3 220146 泰优203 Taiyou203 8/4 8/9 87.89
4 220126 泰丰A×元恢236(CK) Taifeng A×Yuanhui236(CK) 7/30 8/5 50.00
5 220128 EK2S×R203 7/29 8/3 89.39
6 220135 EK2S×Z-3 7/31 8/4 64.55
7 220129 N25S×R203 8/5 8/10 93.58
8 220132 N25S×Z-3 8/2 8/6 73.85
9 220130 泰香A×R203 Taixiang A×R203 8/3 8/8 83.43
10 220131 野香A×R203 Yexiang A×R203 8/1 8/6 91.64
11 220127 垦2001S×R203 Ken2001S×R203 8/4 8/9 90.20

Table 4

Identification results of high temperature tolerance of rice varieties participated in production test of late maturing group of Huifeng enterprise consortium in the middle and lower reaches of the Yangtze River"

Field No.
Variety No.
Name of variety
大田条件 Field condition 盆栽条件 Potting condition 综合相对
Comprehensive relative heat resistance coefficient
Heat resistance rating
Seed setting rate at normal condition (%)
Seed setting rate at high temperature condition (%)
Relative seed setting rate (%)
Relative heat resistance coefficient
Seed setting rate at normal condition (%)
Seed setting rate at high temperature condition (%)
Relative seed setting rate (%)
Relative heat resistance coefficient
BZE211555 1 利两优3822 Liliangyou3822 86.72 76.35 88.04 1.03 84.95 55.53 65.37 1.02 1.02 3 2021
BZE211556 2 95优1号 95you1hao 88.68 68.35 77.07 0.92 83.47 50.97 61.06 0.94 0.93 3
BZE211557 3 果两优桂花丝苗
85.84 71.7 83.53 0.96 84.36 55.47 65.75 1.02 0.99 3
BZE211558 4 竹两优珍25 Zhuliangyouzhen25 87.58 69.22 79.04 0.93 81.17 49.65 61.17 0.91 0.92 3
BZE211559 5 丰两优四号(CK)
Fengliangyousihao (CK)
87.8 74.36 84.69 1.00 83.55 54.47 65.19 1.00 1.00 3
BZE191281 6 两优新月丝苗
81.32 65.45 80.48 0.92 80.63 45.25 56.12 0.93 0.93 3 2019
BZE191286 7 桂香优086 Guixiangyou086 86.85 65.78 75.74 0.93 82.27 47.39 57.60 0.97 0.95 3
BZE191288 8 泰优203 Taiyou203 86.47 76.74** 88.75 1.08** 82.64 55.31** 66.93 1.14** 1.11** 1
BZE191255 9 丰两优四号(CK)
Fengliangyousihao (CK)
88.65 70.83 79.90 1.00 8365 48.64 58.15 1.00 1.00 3

Table 5

Performance of yield and major traits of Taiyou 203 in the regional trials"

Name of variety
Compared with CK (%)
Point ratio compared with CK (%)
Entire growth period (d)
Effective panicle number (万/hm2)
Spikelets per panicle
Seed setting rate (%)
Rice quality
Comprehensive resistance index of rice blast
2019 泰优203 Taiyou 203 9.99 6.70 100.00 131.8 256.50 187.1 88.10 - 4.4 1
Fengliangyousihao (CK)
9.36 135.1 228.00 192.8 85.40 - 7.4 3
2020 泰优203 Taiyou 203 9.30 3.35 94.12 130.9 249.00 198.9 88.20 2 3.7
Fengliangyousihao (CK)
8.99 134.4 213.00 207.0 87.40 - 6.6
汇总 泰优203 Taiyou 203 9.65 5.12 97.06 131.4 252.75 193.0 88.15 2 4.4 1
Fengliangyousihao (CK)
9.18 134.8 220.5 199.9 86.40 - 7.4 3
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