Four Consistent Loci Confer Adult Plant Resistance to Leaf Rust in the Durum Wheat Lines Heller#1 and Dunkler

Author:

Li Zhikang1,Yuan Chan1,Herrera-Foessel Sybil A.2,Randhawa Mandeep S.2,Huerta-Espino Julio3,Liu Demei45,Dreisigacker Susanne2,Singh Ravi P.2,Lan Caixia1ORCID

Affiliation:

1. Huazhong Agricultural University, College of Plant Science & Technology, Wuhan City, Hubei Province 430070, People’s Republic of China

2. International Maize and Wheat Improvement Center, Mexico City 06600, Mexico

3. Campo Experimental Valle de México INIFAP, Chapingo, State of Mexico, Mexico

4. Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, People’s Republic of China

5. China and Qinghai Provincial Key Laboratory of Crop Molecular Breeding, Xining 810008, People’s Republic of China

Abstract

The durum wheat lines Heller#1 and Dunkler from the International Maize and Wheat Improvement Center Global Wheat Program showed moderate and stable adult plant resistance to leaf rust under high disease pressure over field environments in northwestern Mexico. Leaf rust phenotyping was performed on two recombinant inbred line (RIL) populations derived from crosses of Heller#1 and Dunkler with the susceptible parent Atred#2, conducted under artificially induced Puccinia triticina epidemics in 2013, 2014, 2015, and 2016. The Atred#2 × Heller#1 and Atred#2 × Dunkler populations were genotyped by single nucleotide polymorphism (SNP) platforms and diversity arrays technology markers, respectively. Four leaf rust resistance quantitative trait loci were detected simultaneously in the two RIL populations: Lr46, QLr.cim-2BC, QLr.cim-5BL, and QLr.cim-6BL based on phenotypic data across all four crop seasons. They explained 11.7 to 46.8%, 7.2 to 26.1%, 8.4 to 24.1%, and 12.4 to 28.5%, respectively, of the phenotypic variation for leaf rust resistance in Atred#2 × Heller#1 and 16.3 to 56.6%, 6.7 to 15.7%, 4.1 to 10.1%, and 5.1 to 20.2% of the variation in the Atred#2 × Dunkler population. Only the resistance allele of QLr.cim-2BC was from the susceptible parent Atred#2, and resistance alleles at other loci came from the resistant parents Heller#1 and Dunkler. The SNP markers closely linked to Lr46 and QLr.cim-2BC were converted to kompetitive allele specific PCR markers for use in marker-assisted selection to improve leaf rust resistance through crosses with Heller#1 and Dunkler sources.

Publisher

Scientific Societies

Subject

Plant Science,Agronomy and Crop Science

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