Journal
PLANT CELL REPORTS
Volume 19, Issue 4, Pages 363-370Publisher
SPRINGER VERLAG
DOI: 10.1007/s002990050741
Keywords
Daucus carota L.; mitochondrial DNA; repeated cell fusion
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The cytoplasmic male-sterile (CMS) carrot (Daucus carota ssp, sativus) with the petaloid phenotype was asymmetrically fused with eight different fertile cytoplasms to convert the CMS to a fertile state. Restoration to the fertile phenotype was successful with an over 20% efficiency. Cybrids with brown anther sterile, incomplete petaloid sterile, or combined flower fused on the same axis were also observed. Restricted DNA fragment patterns revealed that the mitochondrial genome organizations of the cybrids were not identical to those of their parents but were of an intermediate type. Repeated cell fusion to introduce two different foreign cytoplasms into the CMS cytoplasm was effective for obtaining fertile plants. The role of mitochondrial factors which regulate flower organ morphogenesis was demonstrated.
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