Genetics of self-compatibility in dihaploids ofSolanum tuberosumL. I. Breeding behaviour of two self-compatible dihaploids

✍ Scribed by Janny Olsder; J. G. Th Hermsen

• Book ID: 104619424
• Publisher: Springer
• Year: 1976
• Tongue: English
• Weight: 528 KB
• Volume: 25
• Category: Article
• ISSN: 0014-2336
• DOI: 10.1007/bf00041597

✦ Synopsis

Two highly fertile and self-compatible dihaploids (2n 2x 24) from Solanum tuberosum L. (2n 4x 48) were investigated to elucidate the genetic basis of their self-compatibility. To this end the two dihaploids were selfed and reciprocally intercrossed and the resulting I~ and F~ plants tested for self-compatibility. Reciprocal backcrosses of I~-plants and Fl-plants were made. Complete diallels both within self-compatible and within self-incompatible Fl-plants were carried out as well as reciprocal matings between self-compatible and self-incompatible Fl-plants. From the wealth of data it could be concluded, that the dihaploids have two intact S-alleles, one being common to both. Six hypotheses were tested for explaining self-compatibility in these particular dihaploids. All but one had to be discarded. It is concluded that the self-compatibility most likely is brought about by the presence of an S-bearing translocation, which is not linked to the S-locus. The ratio sc :si in the Fl'S point either to certative disadvantage of translocation-bearing pollen or to lethality of translocation homozygotes. The importance of this self-compatibility mechanism for genetic and breeding research in potato is discussed.