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

Germplasm Evaluation of Tomatillo (Physalis Ixocarpa Brot.) Cropped Under Ontario, Canada and Chapingo, Mexico Environmental Conditions Evaluation of five tomatillo Mexican landraces including altogether 13 accessions was performed under environmental conditions of Ontario, Canada and Chapingo in central Mexico. The measured traits were: beginning of flowering and harvest, total number of harvested fruits and the yield. Number of days to flowering or fruiting was counted from the date of planting. In both localities accessions 1 and 3 of the Rendidora landrace as well as the accession 1 of the Manzano landrace were the earliest and the highest yielding. In Chapingo the accession 1 of the Rendidora landrace gave the yield of fruits almost 4 kg.m-2, in Elora, Canada the same accession was also the best and yielded almost 3 kg.m-2. In general, all accessions were earlier in Elora than in Chapingo; yield in both localities was in general similar except the landrace Milpero obviously poorly suited to Canadian environment. Tomatillo may be considered as a promising new crop for Ontario, Canada agriculture. Yield was correlated negatively, in a significant way, with the number of days to flowering and harvest, it means that the development of early, highly productive varieties by artificial selection is feasible.