Abstract
Phenotypic variability has been reported in several plant somatic hybrids. While in most cases this variability can be ascribed to variation in chromosome number, we have previously reported phenotypic variability despite chromosome stability among clones of somatic hybrids between distantly related Nicotiana species. In order to understand the nature of this interclonal variation and to examine the genetic behavior of somatic hybrids, we produced somatic hybrids combining N. tabacum with N. sylvestris, a progenitor species, and with N. otophora, a sexually compatible species in the Tomentosa subsection of the genus.
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