The inheritance oe colour in diploid potatoes II. A three-factor linkage group

Somatic segregation of the spectacle pattern on potato tubers

“…Spectacle results from failure of pigmentation, giving white eye patches on a coloured background. The genetic control of spectacle on a self-coloured ground in diploids is simple (Dodds and Long, 1956;Dodds and Paxman, 1962) but is more difficult to interpret in the tetraploids, in which spectacle and splash show complex and yet poorly understood interrelations (Howard, 1964).…”

The inheritance of anthocyanin pigmentation in potato (Solanum tuberosum L.) and mapping of tuber skin colour loci using RFLPs

“…Nomenclature of the genetic model for diploid cultivated species and description of phenotypes Dodds & Long (1955, 1956) developed the genetic model for diploid cultivated species.…”

“…Alleles in this material are identical by descent to those involved in previous studies by Lunden (1974). The genotypes of parental clones 7553-1, 79-48 and 7506-1 are described (De Jong, 1987) according to the nomenclature of Dodds & Long (1955, 1956 *Lunden, 1974;Hermsen eta!., 1978;VanEck eta!., 1993;§DeJong, 1987; ¶this article. Li and L2 refer to epidermis and cortex, respectively.…”

“…Without much reference to previous work, Dodds & Long (1955, 1956) developed another genetic model for the inheritance of anthocyanin pigmentation in diploid cultivated species (2n = 2x= 24). The loci F, R/RP", B, I and F were postulated to explain anthocyanin pigmentation in various parts of the plant.…”

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Two existing genetic models for anthocyanin pigmentation are compared: the genetic model as proposed by Lunden (1937Lunden ( , 1960Lunden ( , 1974 for tetraploid potato Solanum tuberosum group Tuberosum and the model by Dodds & Long (1955, 1956) for diploid cultivated Solanum species. By crossing well defined genotypes from both genetic sources it was demonstrated that locus R/RP" and locus D are allelic.

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