Identification and Characterization of Wheat–Aegilops comosa 7M (7A) Disomic Substitution Lines with Stripe Rust and Powdery Mildew Resistance

Author:

Zuo Yuanyuan1,Dai Shoufen12,Song Zhongping1,Xiang Qin1,Li Wenjia1,Liu Gang1,Li Jian1,Xu Donghe3,Yan Zehong12ORCID

Affiliation:

1. Triticeae Research Institute, Sichuan Agricultural University, Chengdu, Sichuan 611130, P.R. China

2. State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Chengdu, Sichuan 611130, P.R. China

3. Japan International Research Center for Agricultural Sciences, Tsukuba, Ibaraki 305-8686, Japan

Abstract

Aegilops comosa (MM, 2n = 2x = 14), an important diploid species from the wheat tertiary gene pool, contains many unique genes/traits of potential use for wheat breeding, such as disease resistance. In this study, three sister lines, NAL-32, NAL-33, and NAL-34, were identified from a wheat–A. comosa distant cross using fluorescence in situ hybridization, simple sequence repeat markers, and PCR-based unique gene markers combined with single nucleotide polymorphism (SNP) array analysis. Genetically, NAL-32 contained neither an alien nor translocation chromosome, whereas NAL-33 and NAL-34 had disomic 7M (7A) substitution chromosomes but differed in the absence or presence of the 1BL/1RS translocation chromosomes, respectively. The absence of 7A in NAL-33 and NAL-34 and the unusual 1B in the latter were verified by wheat 55K SNP arrays. The two 7M (7A) substitution lines had similar levels of resistance to stripe rust and powdery mildew, but better than that of NAL-32 and their common wheat parents, suggesting that the stripe rust and powdery mildew resistance of NAL-33 and NAL-34 were derived from the 7M of A. comosa. This research provides important bridge materials that can potentially be used for transferring stripe rust and powdery mildew resistance.

Funder

Natural National Science Foundation of China

Technology Cooperation Project of Sichuan Province, China

Key Research and Development Program of Sichuan Province, China

Publisher

Scientific Societies

Subject

Plant Science,Agronomy and Crop Science

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