
doi: 10.1007/bf01787372
Interspecific crosses among 27 species ofNicotiana, including all six S.I. species of the genus, revealed a complex, but highly systematic pattern of unilateral incompatibility, apparently encompassing the whole genus. There was a definite relationship between the type of incompatibility and the site of inhibition: in interspecific incompatibility the inhibition occurred in the stigma, in intraspecific incompatibility it occurred in the style.
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