Chromosome location and microsatellite markers linked to a powdery mildew resistance gene in wheat line 'Lankao 90(6)' |
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| Authors: | J. S. Niu B. Q. Wang Y. H. Wang A. Z. Cao Z. J. Qi T. M. Shen |
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| Affiliation: | National Center of Engineering and Technological Research for Wheat, Henan Agricultural University, Zhengzhou 450002, China, E-mail:;;State Key laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing 210095, China;;Nong-hua Seed Limited Company, Lankao 730070, China |
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| Abstract: | Wheat lines known as 'Lankao 90(6)', derived from the cross 'Mzalenod Beer' (hexaploid triticale)/'Baofeng 7228'//'90 Xuanxi', carry a recessive powdery mildew resistance gene temporarily named PmLK906 . Gene PmLK906 appears to be different from known wheat powdery mildew resistance genes. PmLK906 was tagged using microsatellite markers in a segregating population derived from the cross 'Chinese Spring'/'Lankao 90(6)21-12'. The dominant microsatellite marker Xgwm265-2AL was linked in repulsion with PmLK906 at a genetic distance of 3.72 cM, whereas the co-dominant Xgdm93-2AL was linked to PmLK906 at a genetic distance of 6.15 cM. Both markers were placed on chromosome arm 2AL using 'Chinese Spring' nulli-tetrasomic lines. The recessive PmLK906 has a different specificity to the dominant resistance alleles located at the Pm4 locus and appeared to be located to a locus different from Pm4 . |
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| Keywords: | Triticum aestivum powdery mildew resistance gene microsatellite chromosome location |
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