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The Margo (mar) Seedcoat Color Gene Is a Synonym for the Joker (j) Locus in Common Bean

1996; American Society for Horticultural Science; Volume: 121; Issue: 6 Linguagem: Inglês

10.21273/jashs.121.6.1028

2327-9788

Mark J. Bassett,

Soybean genetics and cultivation

The inheritance of hilum ring color in common bean ( Phaseolus vulgaris L.) was investigated using various genetic tester stocks developed by backcrossing recessive alleles into a recurrent parent stock 5-593 with seedcoat genotype P [ C r ] D J G B V Rk , viz., mar BC 2 5-593, mar BC 3 5-593, mar v BC 2 5-593, mar d BC 2 5-593, and mar d BC 3 5-593. The current hypothesis is that the margo character is controlled by mar and hilum ring color is controlled by d but expresses only with mar . The V locus controls flower and seedcoat color. The allelism test crosses `Citroen' ( P C d j g b v lae ) × mar BC 3 5-593 and `Citroen' × mar d BC 3 5-593 demonstrated that mar is allelic with j and that the putative d in mar d BC 3 5-593 is allelic with the d in `Citroen'. Thus, the former genetic tester stocks mar BC 3 5-593 and mar d BC 3 5-593 are reclassified as j BC 3 5-593 and d j BC 3 5-593, respectively, because mar is a synonym for j . Similarly, the former genetic tester stock mar v BC 2 5-593 is reclassified as j v BC 2 5-593. The interaction of j with d expresses as loss of color in the hilum ring. The development of the white-seeded genetic tester stock P c u d j BC 3 5-593 was described in detail, where the all-recessive tester `Prakken 75' was used as the source of the recessive alleles. The previously reported work showing that the partly colored seedcoat gene t interacts with mar to control seedcoat pattern is now interpreted to mean that the joker ( J ) locus interacts with t to produce partly colored seedcoat patterns. The genetic loci D and V were found to segregate independently. The common gene for dull seedcoats (asper, asp ) is discussed and contrasted with j .