Genetic Dissection of Resistance to the Three Fungal Plant Pathogens Blumeria graminis, Zymoseptoria tritici, and Pyrenophora tritici-repentis Using a Multiparental Winter Wheat Population

G3: Genes, Genomes, Genetics

article

Melanie Stadlmeier¹  Lise Nistrup Jørgensen³  Beatrice Corsi⁴  James Cockram⁴  Lorenz Hartl¹  Volker Mohler¹ 

[1] Bavarian State Research Center for Agriculture, Institute for Crop Science and Plant Breeding, Freising 85354, Germany;Technical University of Munich, TUM School of Life Sciences Weihenstephan, Freising 85354, Germany;Aarhus University, Department of Agroecology, Slagelse 4200, Denmark;John Bingham Laboratory, NIAB, Huntingdon Road, Cambridge CB3 0LE, United Kingdom

关键词: QTL analysis;    MAGIC;    Powdery mildew;    Septoria tritici blotch;    Tan spot;    Multiparent Advanced Generation Inter-Cross (MAGIC);    multiparental populations;    MPP;   

DOI  :  10.1534/g3.119.400068

学科分类：社会科学、人文和艺术（综合）

来源: Genetics Society of America

【 摘 要 】

Bread wheat ( Triticum aestivum L.) is one of the world’s most important crop species. The development of new varieties resistant to multiple pathogens is an ongoing task in wheat breeding, especially in times of increasing demand for sustainable agricultural practices. Despite this, little is known about the relations between various fungal disease resistances at the genetic level, and the possible consequences for wheat breeding strategies. As a first step to fill this gap, we analyzed the genetic relations of resistance to the three fungal diseases – powdery mildew (PM), septoria tritici blotch (STB), and tan spot (TS) – using a winter wheat multiparent advanced generation intercross population. Six, seven, and nine QTL for resistance to PM, STB, and TS, respectively, were genetically mapped. Additionally, 15 QTL were identified for the three agro-morphological traits plant height, ear emergence time, and leaf angle distribution. Our results suggest that resistance to STB and TS on chromosome 2B is conferred by the same genetic region. Furthermore, we identified two genetic regions on chromosome 1AS and 7AL, which are associated with all three diseases, but not always in a synchronal manner. Based on our results, we conclude that parallel marker-assisted breeding for resistance to the fungal diseases PM, STB, and TS appears feasible. Knowledge of the genetic co-localization of alleles with contrasting effects for different diseases, such as on chromosome 7AL, allows the trade-offs of selection of these regions to be better understood, and ultimately determined at the genic level.

【 授权许可】

CC BY|CC BY-NC