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Use of consensus maps to differentiate QTL for leaf and stripe rust resistance

By: Contributor(s): Material type: TextTextPublication details: Mexico, DF (Mexico) CIMMYT : 2011Description: p. 85ISBN:
  • 978-970-648-179-5
Summary: Over the past ten years there have been at least 15 and 25 publications on QTL associated with leaf rust and stripe rust resistance, respectively. Each publication generally reports multiple resistance loci, resulting in a number of QTL from different sources on nearly every chromosome. To complicate the issue different marker platforms such as RFLP, SSR, AFLP, CAPS, RAPD, DArT, STS, RGAP and SNP were used in these studies. This makes it very difficult to identify which loci are likely to be novel and available for recombination in breeding programs. For example, recent work on the Avocet × Pastor RIL population identified the Lr46/Yr29 locus on 1BL and separate loci for leaf rust and stripe rust severity on the same chromosome. There were seven other reports in the literature identifying 1B QTL for these rusts. Four of these were identified as the Lr46/Yr29 locus with the other three reports potentially being different loci. Consensus maps of all flanking markers were investigated and the QTL formed two major clusters. We were able to locate the two Pastor QTL for leaf and stripe rust severity on a 1BS section that grouped with leaf rust QTL identified in the winter wheat ?Forno? (Messmer et al. 2000; Schnurbusch et al. 2004). We also identified the Lr46/Yr29 locus of Pastor with numerous flanking markers from other studies on 1BL (Lillemo et al 2008; Suenaga et al. 2003; William et al. 2006; Melichar et al. 2008). A third region associated with a High Temperature Adult Plant (HTAP) resistance gene (Lin and Chen 2009) was not differentiated from the Lr46/Yr29 locus as the Resistance Gene Analogue Polymorphic markers used to define the HTAP QTL had not been used in any Lr46/Yr29 studies. However, we have shown that linked SSR markers place the HTAP locus between the two abovementioned clusters. Data is presented on a number of chromosomes where multiple QTLs have been identified as a means to separate the loci and give clues as to where allele testing would be needed to further discriminate loci.
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Abstract only

Over the past ten years there have been at least 15 and 25 publications on QTL associated with leaf rust and stripe rust resistance, respectively. Each publication generally reports multiple resistance loci, resulting in a number of QTL from different sources on nearly every chromosome. To complicate the issue different marker platforms such as RFLP, SSR, AFLP, CAPS, RAPD, DArT, STS, RGAP and SNP were used in these studies. This makes it very difficult to identify which loci are likely to be novel and available for recombination in breeding programs. For example, recent work on the Avocet × Pastor RIL population identified the Lr46/Yr29 locus on 1BL and separate loci for leaf rust and stripe rust severity on the same chromosome. There were seven other reports in the literature identifying 1B QTL for these rusts. Four of these were identified as the Lr46/Yr29 locus with the other three reports potentially being different loci. Consensus maps of all flanking markers were investigated and the QTL formed two major clusters. We were able to locate the two Pastor QTL for leaf and stripe rust severity on a 1BS section that grouped with leaf rust QTL identified in the winter wheat ?Forno? (Messmer et al. 2000; Schnurbusch et al. 2004). We also identified the Lr46/Yr29 locus of Pastor with numerous flanking markers from other studies on 1BL (Lillemo et al 2008; Suenaga et al. 2003; William et al. 2006; Melichar et al. 2008). A third region associated with a High Temperature Adult Plant (HTAP) resistance gene (Lin and Chen 2009) was not differentiated from the Lr46/Yr29 locus as the Resistance Gene Analogue Polymorphic markers used to define the HTAP QTL had not been used in any Lr46/Yr29 studies. However, we have shown that linked SSR markers place the HTAP locus between the two abovementioned clusters. Data is presented on a number of chromosomes where multiple QTLs have been identified as a means to separate the loci and give clues as to where allele testing would be needed to further discriminate loci.

Global Wheat Program

English

Lucia Segura

INT2833|INT3219|INT0610

CIMMYT Staff Publications Collection


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