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Self-Compatibility Inheritance in Tomatillo (Physalis Ixocarpa Brot.)

Mulato-Brito, Juan, Peña-Lomelí, Aureliano, Sahagún-Castellanos, Jaime, Villanueva-Verduzco, Clemente, de Jesús López-Reynoso, José
Vegetable crops research bulletin 2007 v.67 no.-1 pp. 17-24
Physalis philadelphica, alleles, cytoplasm, dominant genes, gametophytes, heterozygosity, inheritance (genetics), landraces, loci, males, mutation, progeny, reciprocal crosses, self-pollination, stigma
One of the main limiting factors to improve tomatillo is the presence of self-incompatibility which has been reported to be gametophytic. In an early research, a self-compatible plant was found in the Rendidora landrace and this allowed us to investigate the inheritance of self-compatibility gene (s) in tomatillo. The following crosses were performed: self-compatible x self-incompatible, self-compatible x self-compatible and self-incompatible x self-incompatible and their respective reciprocal crosses. Segregation ratios on self-compatibility versus self-incompatibility in their offspring indicate that self-compatibility is not inherited via cytoplasm, so the responsible gene is located in chromosomes. The inheritance of self-compatibility is due to a single dominant gene (Sc) which is a mutation at the S locus. Self-compatible individuals are strictly heterozygous (Sc,₄) and finally, the self-compatibility allele (Sc), in the male side (Sc,₄), seems to be non functional when self-pollinating the Sc,₄ stigma. A single gene controlling stem pubescence was also found.