Abstract
Interspecific crosses between, different genotypes and species ofNicotianahave revealedSgene polymorphism on a large scale. In the usually yellow-flowered self-compatible speciesN. glaucaa strain occurs that has a self-incompatibility gene which is tightly linked with the bright-red corolla colour gene. In self-incompatible species, there are two kinds of self-incompatibility alleles,SIandSFI, distinguished on the basis of the acceptability ofN. langsdorffiipollen. TheSIform has a large number of alleles whereas theSFIform has only two,SF10andSF11. TheSIalleles are again divisible into two groups on the basis of the acceptability ofN. noctiflorapollen and, on the same criterion, the twoSFIalleles,SF10andSF11, also are distinguishable.N. noctifloraandN. bonariensisplants could be divided into two and three groups respectively on the basis of interspecific compatibility relationships. When plants of each species were crossed among themselves, they formed two and three intra-incompatible and inter-compatible groups respectively, identical with those found on the basis of interspecific compatibility relationships. The significance of this observation is at present not fully understood.
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