Genetic mapping reveals a single major QTL for bacterial wilt resistance in Italian ryegrass (Lolium multiflorum Lam.)

TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik
Bruno StuderRoland Kölliker

Abstract

Bacterial wilt caused by Xanthomonas translucens pv. graminis (Xtg) is a major disease of economically important forage crops such as ryegrasses and fescues. Targeted breeding based on seedling inoculation has resulted in cultivars with considerable levels of resistance. However, the mechanisms of inheritance of resistance are poorly understood and further breeding progress is difficult to obtain. This study aimed to assess the relevance of the seedling screening in the glasshouse for adult plant resistance in the field and to investigate genetic control of resistance to bacterial wilt in Italian ryegrass (Lolium multiflorum Lam.). A mapping population consisting of 306 F1 individuals was established and resistance to bacterial wilt was assessed in glasshouse and field experiments. Highly correlated data (r = 0.67-0.77, P < 0.01) between trial locations demonstrated the suitability of glasshouse screens for phenotypic selection. Analysis of quantitative trait loci (QTL) based on a high density genetic linkage map consisting of 368 amplified fragment length polymorphism (AFLP) and simple sequence repeat (SSR) markers revealed a single major QTL on linkage group (LG) 4 explaining 67% of the total phenotypic variance (Vp). In addi...Continue Reading

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Citations

Apr 12, 2007·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Bruno StuderRoland Kölliker
May 1, 2008·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Peter M DracatosJ W Forster
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Oct 27, 2010·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Fabienne WichmannRoland Kölliker
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Dec 7, 2018·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Verena KnorstRoland Kölliker

Related Concepts

Breeding
Genome Mapping
Genetic Markers
Resistance, Natural
Genetic Linkage Analysis
Lolium (plant)
Plant Diseases
Seedling
Quantitative Trait Loci

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