NDLI: PCR-based markers for the powdery mildew resistance gene Pm4a in wheat

Content Provider	Springer Nature Link
Author	Ma, Z. Q. Wei, J. B. Cheng, S. H.
Copyright Year	2004
Abstract	Gene tagging is the basis of marker-assisted selection and map-based cloning. To develop PCR-based markers for Pm4a, a dominant powdery mildew resistance gene of wheat, we surveyed 46 group 2 microsatellite markers between Pm4a near-isogenic line (NIL) CI 14124 and the recurrent parent Chancellor (Cc). One of the markers, gwm356, detected polymorphism and was used for genotyping an F2 population of 85 plants derived from CI 14124 × Cc. Linkage mapping indicated that Xgwm356 was linked to Pm4a at a distance of 4.8 cM. To identify more PCR-based markers for Pm4a, we also converted the restriction fragment length polymorphism marker BCD1231 linked to it into a sequence-tagged site (STS) marker. The STS primer designed based on the end sequences of BCD1231 amplified an approximately 1.6-kb monomorphic band in both parents. Following digestion of the products with the four-cutter enzymes HaeIII and MspI, it was discovered that the band from CI 14124 consisted of at least two products, one of which had a digestion pattern different from the band from Cc. In the F2 population, the cleaved polymorphism revealed by the STS marker between the parents co-segregated with powdery mildew resistance. To design Pm4a-specific PCR markers, the 1.6-kb band from Cc and the fragment associated with Pm4a in CI 14124 were sequenced and compared. Based on these sequences a new PCR marker was identified, which detected a 470-bp product only in the Pm4a-containing lines. These PCR-based markers provide a cost-saving option for marker-assisted selection of Pm4a.
Starting Page	140
Ending Page	145
Page Count	6
File Format	PDF
ISSN	00405752
Journal	Theoretical and Applied Genetics
Volume Number	109
Issue Number	1
e-ISSN	14322242
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-02-25
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine Biotechnology Agronomy and Crop Science

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