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Genetic behavior of somatic hybrids in the genus nicotiana nicotiana otophora plus nicotiana tabacum and nicotiana sylvestris plus nicotiana tabacum



Genetic behavior of somatic hybrids in the genus nicotiana nicotiana otophora plus nicotiana tabacum and nicotiana sylvestris plus nicotiana tabacum



Theoretical & Applied Genetics 65(2): 93-101



Somatic hybrids were produced between N. tabacum and 2 closely related species in the genus Nicotiana, N. otophora and N. sylvestris, to evaluate interclonal variation and genetic behavior of these hybrids. As with the previously reported N. nesophila + N. tabacum somatic hybrids, variation for morphological and isoenzyme characters between somatic hybrid clones was detected, despite stability of chromosome numbers. One clone of N. sylvestris + N. tabacum was marked by variation in leaf spot frequency. The inheritance of this unstable trait was monitored through 2 sexual generations. Transmission of the Su gene marker was monitored in self-fertilized and backcrossed progeny of the N. sylvestris + N. tabacum somatic hybrids. Segregation ratios were similar to those previously reported for amphiploid N. sylvestris .times. N. tabacum sexual hybrids.

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