Abstract
Key message
A new recessive powdery mildew resistance gene, Pm223899, was identified in Afghanistan wheat landrace PI 223899 and mapped to an interval of about 831 Kb in the terminal region of the short arm of chromosome 1A.
Abstract
Wheat powdery mildew, a globally important disease caused by the biotrophic fungus Blumeria graminis f.sp. tritici (Bgt), has occurred with increased frequency and severity in recent years, and some widely deployed resistance genes have lost effectiveness. PI 223899 is an Afghanistan landrace exhibiting high resistance to Bgt isolates collected from the Great Plains. An F2 population and F2:3 lines derived from a cross between PI 223899 and OK1059060-126135-3 were evaluated for response to Bgt isolate OKS(14)-B-3-1, and the bulked segregant analysis (BSA) approach was used to map the powdery mildew resistance gene. Genetic analysis indicated that a recessive gene, designated Pm223899, conferred powdery mildew resistance in PI 223899. Linkage analysis placed Pm223899 to an interval of about 831 Kb in the terminal region of chromosome 1AS, spanning 4,504,697–5,336,062 bp of the Chinese Spring reference sequence. Eight genes were predicted in this genomic region, including TraesCS1AG008300 encoding a putative disease resistance protein RGA4. Pm223899 was flanked proximally by a SSR marker STARS333 (1.4 cM) and distally by the Pm3 locus (0.3 cM). One F2 recombinant was identified between Pm3 and Pm223899 using a Pm3b-specific marker, indicating that Pm223899 is most likely a new gene, rather than an allele of the Pm3 locus. Pm223389 confers a high level of resistance to Bgt isolates collected from Pennsylvania, Oklahoma, Nebraska, and Montana. Therefore, Pm223389 can be used to enhance powdery mildew resistance in these states. Pm3b-1 and STARS333 have the potential to tag Pm223389 in wheat breeding.
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01 November 2018
Unfortunately, the caption of Fig. 2 was incorrectly published in the original publication. The complete correct caption should read as follows.
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Acknowledgements
We thank M. Hargrove and R. Whetten for excellent technical assistance and Dr. Robert McIntosh of Sydney University for reviewing this paper. Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the USDA. The USDA is an equal opportunity provider and employer.
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Communicated by Xianchun Xia.
Unfortunately, the caption of Figure 2 was incorrectly published in the original publication. The complete correct caption should read as follows.
Fig. 2 Graphical genotypes and phenotypes of critical F2 plants and corresponding F3 phenotypes. Pm223899 was mapped to an interval flanked by Pm3b-1 and STARS333. Only one plant is shown for each genotype. R, S, HR, HS, and Seg represent resistant, susceptible, homozygous resistant, homozygous susceptible, and segregating, respectively.
Also, under the “Discussion section”, 3rd paragraph, the following sentence was incorrectly published and the complete correct sentence is given below.
There are 18 functional alleles at the Pm3 locus (Pm3a-Pm3r) (Yahiaoui et al. 2004, 2009; Bhullar et al. 2009, 2010), and one of them, Pm3a, is widely used in the hard red winter wheat breeding programs in the Great Plains region (Li et al. 2016).
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Li, G., Carver, B.F., Cowger, C. et al. Pm223899, a new recessive powdery mildew resistance gene identified in Afghanistan landrace PI 223899. Theor Appl Genet 131, 2775–2783 (2018). https://doi.org/10.1007/s00122-018-3199-y
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DOI: https://doi.org/10.1007/s00122-018-3199-y