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Progeny analysis of the interspecific somatic hybrids nicotiana tabacum cytoplasmic male sterile plus nicotiana sylvestris with respect to nuclear and chloroplast markers



Progeny analysis of the interspecific somatic hybrids nicotiana tabacum cytoplasmic male sterile plus nicotiana sylvestris with respect to nuclear and chloroplast markers



Theoretical & Applied Genetics 56(4): 145-150



The progeny of a fusion experiment involving N. sylvestris protoplasts and X-irradiated protoplasts of the cytoplasmic male sterile 'Line 92' (N. tabacum nucleus and alien, male-sterility inducing, cytoplasm) were analyzed. Three groups of somatic hybrid plants resulted: Type A, Type B-1 and Type B-2. These as well as their androgenic progenies and the progenies resulting from their pollination with N. tabacum or N. sylvestris were followed with respect to several nuclear and cytoplasmic traits. Those controlled by the nuclear genome were plant and flower morphologies; those controlled by genetic information in the cytoplasm were tentoxin [produced by Alternaria tenuis] sensitivity (affecting the coupling factor of chloroplast ATPase), the large subunit of ribulose bisphosphate carboxylase and the restriction endonuclease pattern of plastid DNA. A further cytoplasmic trait investigated (exact site of genetic control not known) was male sterility. The examinations of the somatic-hybrid groups and their respective progenies indicated that Type A plants have N. sylvestris nuclei and 'Line 92' plastids; Type B-1 plants also have 'Line 92' plastids but their genome is composed of N. sylvestris and N. tabacum nuclei; Type B-2 plants with impaired male fertility had N. sylvestris plastids and N. sylvestris nuclei.

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