Abstract
The organization of the mitochondrial genome of B3, B4 and B5generations of hybrids created by backcrossing sterile wild beet Betamaritima with a fertile O-type sugar beet line was studied usingrestriction fragment length polymorphism (RFLP) analysis. Random amplifiedpolymorphic DNA (RAPD) analysis was used to study restoration of the fertile(O-type) sugar beet genotype in hybrids after multiple backcrossings.Restriction of mtDNAs from the cytoplasm of B. maritimaandhybrids revealed BamHI, EcoRI andXhoI restriction patterns different from those for sterileand fertile sugar beet lines. The most conspicuous feature of our accession ofsterile wild beet mtDNA was the absence of the 10.7-kbEcoRI fragment detected in the cytoplasm of S-type sterileB. maritima and sugar beet. The hybridization of digestedmtDNAs with coxII, atpA andatp6 homologous probes revealed alterations within thesegene loci that distinguished wild beet and hybrids from sugar beets.Characteristic hybridization profiles for the wild beet and B3, B4 and B5hybrids were observed for all probes regardless of the restrictase used todigest mtDNA. Notable changes in atpA andatp6 genes resulted when probes that comprised the5′flanking sequences of these genes and a small part of the coding sequences wereused. RFLP analysis of the sterile B. maritimamitochondrial genome further supported the unique character of this source ofwild beet sterility. The genotypic differences between hybrids and parentalaccessions were determined by scoring PCR-RAPD reaction products for nineselected primers. The diversity of the B. maritimagenotyperesulted in a lower genetic similarity index in comparison with hybrids,sterileand fertile lines of sugar beet. The dendrogram obtained after cluster analysisdistinguished hybrids as a group that differed from wild beet and themaintainersugar beet line used for backcrossing. These results may indicate incompleterestoration of the fertile sugar beet genotype in hybrids.
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Sadoch, Z., Goc, A., Wierzchosławski, R. et al. Cytoplasmic male sterility in hybrids of sterile wild beet (Beta vulgaris ssp. maritima) and O-type fertile sugar beet (Beta vulgaris L.): molecular analysis of mitochondrial and nuclear genomes. Molecular Breeding 11, 137–148 (2003). https://doi.org/10.1023/A:1022450430434
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DOI: https://doi.org/10.1023/A:1022450430434