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Quantitative trait loci conditioning resistance to Phaeospharia leaf spot of maize caused by Phaeospaeria maydis
- Abstract::
- Phaeosphaeria leaf spot (PLS) is a potentially important disease of maize (Zea mays) that has appeared in winter breeding nurseries in southern Florida. Inbred lines related to B73 are particularly susceptible to Phaeosphaeria leaf spot, whereas inbreds related to Mo17 are highly resistant. A previous study of the inheritance of resistance to Phaeosphaeria leaf spot in the cross B73 x Mo17 found that resistance is highly heritable and controlled by mostly additive gene action at three or four loci. In this study, we used 158 recombinant inbred (RI) lines derived from the cross B73 x Mo17 to map quantitative trait loci (QTL) governing resistance. The RI lines along with the parent inbred lines and the F1 were evaluated for PLS resistance in replicated trials over two winter growing seasons in southern Florida. Using the composite interval mapping (CIM) function of PLABQTL software, five QTL on four different chromosomes were found to control PLS resistance in Mo17. In addition, the additive x additive interaction between two of these QTL was found to be significant. Our results are in close agreement with the previous study, where generation mean analysis was used to study the inheritance of resistance to PLS.
- Author(s):
- Carson, M.L. , Stuber, C.W. , Senior, M.L.
- Subject(s):
- Zea mays , corn , host plants , quantitative trait loci , disease resistance , heritability , plant genetics , leaf spotting , Pleosporales , plant pathogenic fungi
- Description:
- Includes references
- Source:
- Plant disease 2005 June, v. 89, no. 6
- Language:
- English
- Year:
- 2005
- Collection:
- Journal Articles, USDA Authors, Peer-Reviewed
- File:
- Download [PDF]
- Rights:
- Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
