Three QTL regions for restoration of owen CMS in sugar beet
2002
Hjerdin-Panagopoulos, A. | Kraft, T. | Rading, I.M. | Tuvesson, S. | Nilsson, N.O.
Three quantitative trati loci (QTL) regions for the restoration of Owen CMS (cytoplasmic male sterility) in sugar beet (Beta vulgaris L.ssp. vulgaris) were identified through analysis of three populations segregating for genes restoring the fertility of cytoplasmic male sterile plants. Two large populations, A and B, were studied by means of 51 and 42 polymorphic and evenly distributed restriction fragment length polymorphism (RFLP) markers, respectively. A smaller population, C, was analyzed by use of six RFLP markers. Composite interval mapping in Population A detected a strong signal on linkage group IV that explained 79% of the phenotypic variation. More detailed analysis revealed the presence of two linked QTL on this chromosome. In Population B, a QTL that explained 72% of the phenotypic variation was detected at one end of linkage group III. Single-marker analysis of Population C resulted in significant signals for markers on linkage group IV, explaining 57% of the phenotypic variation. In each of the two large populations, what appeared to be minor alleles were also detected in the QTL regions.
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