Abstract
Solanum verrucosum (2n=24) is easily crossable with many diploid species and haploids, but usually as a female partner only. All interspecific hybrids studied appeared male sterile due to interaction of S. verrucosum plasmons with genes from male parents. Seven male sterility types have been discovered in the investigations made on 21 S. verrucosum introductions and their interspecific hybrid derivatives. These are briefly discussed. S. verrucosum proves to possess at least four plasmons denoted as [Trs], [Pss], [Svs] and [nss]. Each produces a diagnostic type of male sterility in the presence of the specific plasmon-sensitive genes which are widely spread. The role of hybrid sterility as a barrier to gene exchange between populations is discussed.
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