Comparative analysis of multiple disease resistance in ryegrass and cereal crops
Theoretical and Applied Genetics(2008)
摘要
Ryegrass ( Lolium spp.) is among the most important forage crops in Europe and Australia and is also a popular turfgrass in North America. Previous genetic analysis based on a three-generation interspecific ( L. perenne × L. multiflorum ) ryegrass population identified four quantitative trait loci (QTLs) for resistance to gray leaf spot ( Magneporthe grisea ) and four QTLs for resistance to crown rust ( Puccinia coronata ). The current analysis based on the same mapping population detected seven QTLs for resistance to leaf spot ( Bipolaris sorokiniana ) and one QTL for resistance to stem rust ( Puccinia graminis ) in ryegrass for the first time. Three QTLs for leaf spot resistance on linkage groups (LGs) 2 and 4 were in regions of conserved synteny to the positions of resistance to net blotch ( Drechslera teres ) in barley ( Hordeum vulgare ). One ryegrass genomic region spanning 19 cM on LG 4, which contained three QTLs for resistance to leaf spot, gray leaf spot, and stem rust, had a syntenic relationship with a segment of rice chromosome 3, which contained QTLs for resistance to multiple diseases. However, at the genome-wide comparison based on 72 common RFLP markers between ryegrass and cereals, coincidence of QTLs for disease resistance to similar fungal pathogens was not statistically significant.
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关键词
Leaf Spot,Stem Rust,Perennial Ryegrass,Crown Rust,Gray Leaf Spot
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