中国农业科学 ›› 2025, Vol. 58 ›› Issue (16): 3304-3316.doi: 10.3864/j.issn.0578-1752.2025.16.013

• 作物遗传育种·种质资源·分子遗传学 • 上一篇    下一篇

兼抗白粉病和条锈病的小麦-中间偃麦草7JS附加系CH71的分子细胞学鉴定

张树伟1(), 史文宇1, 李冰洁1, 常松鹤1, 乔麟轶1, 李欣1, 常利芳1, 陈芳1, 郭慧娟1, 畅志坚1, 张晓军1,2,*()   

  1. 1 山西农业大学农学院(作物科学研究所),太原 030031
    2 农业农村部有机旱作农业重点实验室(部省共建),太原 030031
  • 收稿日期:2025-02-25 接受日期:2025-04-22 出版日期:2025-08-11 发布日期:2025-08-11
  • 通信作者:
    张晓军,E-mail:
  • 联系方式: 张树伟,E-mail:zshuwei@sxau.edu.cn。
  • 基金资助:
    山西省小麦育种联合攻关项目(NYGG26); 山西农业大学优秀博士启动项目(2024BQ49); 山西省自然科学基金(202103021224140); 山西农业大学农学院育种工程专项(YZ2021-0)

Molecular Cytogenetic Characterization of Wheat-Thinopyrum intermedium 7JS Addition Line CH71 with Resistance to Both Powdery Mildew and Stripe Rust

ZHANG ShuWei1(), SHI WenYu1, LI BingJie1, CHANG SongHe1, QIAO LinYi1, LI Xin1, CHANG LiFang1, CHEN Fang1, GUO HuiJuan1, CHANG ZhiJian1, ZHANG XiaoJun1,2,*()   

  1. 1 College of Agriculture (Institute of Crop Sciences), Shanxi Agricultural University, Taiyuan 030031
    2 Key Laboratory of Sustainable Dryland Agriculture (Co-Construction by Ministry and Province), Ministry of Agriculture and Rural Affairs, Taiyuan 030031
  • Received:2025-02-25 Accepted:2025-04-22 Published:2025-08-11 Online:2025-08-11

摘要:

【目的】中间偃麦草是小麦的三级基因库,利用远缘杂交将中间偃麦草含优异基因的染色体导入小麦背景创制新型种质资源,探究其对小麦抗病性及农艺性状的影响,为小麦育种改良提供理论依据。【方法】以普通小麦烟农999与小麦-中间偃麦草部分双二倍体TAI8047杂交BC1F6代选育的小麦新品系CH71为试验材料,利用Oligo-pSc119.2、Oligo-pTa535、Oligo-B11、Oligo-pDb12H等探针通过非变性荧光原位杂交(non-denaturing fluorescence in situ hybridization,ND-FISH)进行核型分析,明确CH71及其亲本的染色体组成;通过Synt探针的Oligo-FISH painting技术,鉴定CH71外源染色体同源群归属,并结合中间偃麦草特异STS标记进行PCR扩增验证;利用国内流行的白粉菌小种E09和条锈菌混合小种CYR32、CYR33、CYR34对CH71进行抗病性鉴定,并测定其株高、穗长、小穗数、千粒重、粒长、粒宽等农艺性状。【结果】小麦亲本烟农999含有21对小麦染色体;部分双二倍体亲本TAI8047含有58条染色体,包括21对小麦染色体和8对外源染色体;CH71含有44条染色体,包括21对小麦染色体和1对外源染色体JS-1;利用Synt7探针对CH71进行Oligo-FISH painting鉴定,表明CH71附加的JS-1染色体可能为中间偃麦草7JS染色体;进一步利用中间偃麦草第7同源群的183对STS引物对CH71进行PCR扩增,筛选到12个可以同时在中间偃麦草、TAI8047和CH71中扩增出特异条带的STS标记,表明JS-1为中间偃麦草7JS染色体;人工接种我国广泛流行的白粉菌小种E09和条锈菌混合小种CYR32、CYR33、CYR34,抗性鉴定表明,CH71中抗白粉病、免疫条锈病,遗传分析表明,其对白粉病和条锈病的抗性可能均来自中间偃麦草7JS染色体;农艺性状调查表明,CH71的株高比小麦亲本烟农999增加24.0 cm、穗长增加3.44 cm、小穗数增加1.6个、粒长增加0.68 mm,但千粒重降低6.78%、粒宽减少2.70%。【结论】新品系CH71为小麦-中间偃麦草7JS异附加系,兼抗小麦白粉病和条锈病,可作为有价值的种质资源用于小麦抗病育种及外源抗病基因克隆;筛选到12个STS标记可为小麦背景下中间偃麦草7JS染色体的快速鉴定提供便捷。

关键词: 小麦, 中间偃麦草, 异附加系, 荧光原位杂交, STS标记

Abstract:

【Objective】Thinopyrum intermedium, a tertiary gene pool of wheat, harbors valuable genetic resources for wheat improvement. This study aimed to develop novel wheat germplasms by transferring elite chromosomes from Thinopyrum intermedium into wheat via distant hybridization, investigating their impacts on disease resistance and agronomic traits to establish a theoretical foundation for wheat breeding. 【Method】A wheat-Thinopyrum intermedium disomic addition line, CH71 (2n=44), was developed from the BC1F6 progeny of a cross between common wheat cultivar Yannong 999 and the partial amphidiploid TAI8047 (2n=58). Non-denaturing fluorescence in situ hybridization (ND-FISH) with oligonucleotide probes (Oligo-pSc119.2, Oligo-pTa535, Oligo-B11, Oligo-pDb12H) was employed for karyotype analysis. Synteny-based (Synt) Oligo-FISH painting and Th. intermedium-specific STS markers were utilized to identify the homologous group and validate the origin of the alien chromosome. Disease resistance to powdery mildew (race E09) and stripe rust (mixed races CYR32, CYR33, CYR34) was evaluated under artificial inoculation. Agronomic traits, including plant height, spike length, spikelet number, thousand-grain weight, grain length, and grain width, were systematically measured.【Result】The wheat parent Yannong 999 exhibited a standard karyotype of 21 wheat chromosome pairs. TAI8047 contained 58 chromosomes (21 wheat pairs + 8 alien pairs), while CH71 harbored 44 chromosomes (21 wheat pairs + 1 alien pair, JS-1). Synt-FISH and PCR amplification using 183 STS primers specific to Th. intermedium chromosome 7JS confirmed JS-1 as a 7JS-derived chromosome. Twelve STS markers consistently amplified diagnostic bands in Th. intermedium, TAI8047, and CH71. CH71 displayed moderate resistance to powdery mildew and immunity to stripe rust, with genetic analysis indicating both resistances were conferred by the 7JS chromosome. Compared to Yannong 999, CH71 exhibited significant increases in plant height (+24.0 cm), spike length (+3.44 cm), spikelet number (+1.6), and grain length (+0.68 mm), but reductions in thousand-grain weight (-6.78%) and grain width (-2.70%). 【Conclusion】The novel disomic addition line CH71 (wheat-Th. intermedium 7JS) demonstrates dual resistance to powdery mildew and stripe rust, serving as a valuable germplasm resource for disease-resistant breeding and the cloning of alien resistance genes. The 12 STS markers identified herein provide an efficient molecular tool for rapid tracking of the 7JS chromosome in wheat backgrounds.

Key words: wheat, Thinopyrum intermedium, alien addition line, fluorescence in situ hybridization, STS markers