Abstract
Cytoplasmic factors were transferred to Nicotiana tabacum L. by protoplast fusion from a cross-incompatible species, N. repanda Willd., whose nuclei were inactivated by X-irradiation. Among the regenerated plants from the polyethylene glycol-treated (PEG-treated) mixture of protoplasts, two types of sterile plant were found; one showed aberrations in somatic chromosome numbers and carried cytoplasm characteristic of N. tabacum, and the other showed characteristics of cytoplasmic male sterility, such as feminized anthers, and had chloroplast genomes from either of the two parental species. Although mitochondrial genomes of these cytoplasmic male sterile plants were modified by intergenomic recombination, the variation in the structure of mitochondrial DNA (mtDNA) was very small among the cytoplasmic male sterile plants.
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