ISHS Acta Horticulturae 370: International Symposium on Tropical Fruits
SELF-INCOMPATIBILITY IN PASSION FRUIT (PASSIFLORA EDULIS SIMS) |
| Authors: | C.H. Bruckner, V.W.D. Casali, C.F. de Moraes, A.J. Regazzi, E.A.M. da Silva |
| Keywords: | Sporophytic self-incompatibility, pollination, fruit-set, breeding, genetic |
| Abstract:
Self-incompatibility was studied in plants of passion fruit, randomly selected and crossed. Two generation progenies were obtained. No fruit setting was obtained by self-pollination at anthesis. Bud-selfing resulted in 14.8% fruit set, indicating that self-fertilization is possible. Reciprocal diallel crosses made in two full sib cross progenies with one common parent, showed two self incompatible groups in one progeny (progeny 300) and three groups in another (progeny 400). Progeny 414.414 - obtained by bud-selfing of a plant from progeny 400 - yielded to two groups. Three phenotypes, S1, S2, and S3, were identified by intercrossing these seven self-incompatible groups. Five backcrosses were incompatible with the male and 12 with the female parents, supporting the sporophytic homomorphic incompatibility hypothesis. S1 and S2 plants obtained by selfing a S2 plant showed S2 allele dominance over S1. S3 plants derived by crossing S2 x S2 plants demonstrated the S2 dominance over S3. Dominance relationships between the tested alleles seem to be the same in the stigma and pollen. These results fit a S-single-locus hypothesis. | |
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