Abstract
Abstract Intercrossing within dioecious Carica species (C. pennata (Heilborn) Svensk, C. parviflora (A. DC.) Solms, C. cauliflora Jacq., C. goudotiana (Tr. & PL) Solms) produce staminate and pistillate plants in equal proportions. Carica monoica Desf., a monoecious species, produces only monoecious offspring upon selfing or intercrossing. Crosses between C. monoica as the pollen parent and pistillate plants of dioecious Carica produce a monoecious F1 and an F2 ratio of 3 monoecious: 1 pistillate. When C. cauliflora is used as the pollen parent with C. monoica, the F1 ratio is 1 staminate: 1 monoecious. Backcrossing monoecious F1 plants of this cross with staminate plants of C. cauliflora produces 1 monoecious: 1 pistillate:2 staminate. The cross between C. goudotiana (seed parent) and Carica monoica (pollen parent) was obtained but the reciprocal cross never succeeded. The backcross, using staminate C. goudotiana, produces only staminate and pistillate plants in a 1:1 ratio. Varying degrees of androecium suppression causing seasonal production of staminate flowers were observed in the F1 and F2 generations of the cross, C. goudotiana x C. monoica, while occasional production of hermaphroditic flowers was observed in monoecious F1 and F2 individuals of the cross, C. cauliflora x C. monica. These results are discussed in relation to two hypotheses used to explain sex determination in Carica species.
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