Articles
Interspecific hybridization between Argentinean species of genus Passiflora subgenus Passiflora
Article number
1434_48
Pages
343 – 350
Language
English
Abstract
Interspecific hybridization is one of the most important sources to increase genetic variability in plant breeding. Passiflora is the largest genus of the Passifloraceae family; it has many species and great phenotypic variability.
There are nineteen species of Passiflora native to Argentina, within four taxonomic subgenera: Passiflora, Decaloba, Dysosmia and Tacsonioides. Unlike most species of the genus distributed in warmer regions, some Argentinean species would tolerate colder climates.
In order to obtain ornamental cultivars of passionflower tolerant to low temperatures, interspecific crosses were carried out between nine taxa belonging to genus Passiflora subgenus Passiflora: P. alata, P. amethystina, P. caerulea, P. cincinnata, P. edulis f. edulis, P. edulis f. flavicarpa, P. elegans and two cytotypes of P. mooreana, one diploid and the other tetraploid.
Combinatory capability and hybrid viability were studied.
Fruits were obtained in 40 of the 72 crosses.
Among the couples, 12 were reciprocally fertile, acting as a male and female parent, 17 set fruit in only one direction, while the other seven were reciprocally sterile, manifesting pre-zygotic barriers.
The species P. amethystina stood out for its high interspecific aptitude (with six of the eight taxa with which it was crossed), whereas P. alata showed the highest number of non-viable crosses.
One of the most prolific couples tested in this work was P. amethystina and P. caerulea. A large number of hybrids published among them supports the affinity between these species.
Post-zygotic barriers were found, expressed as fails in the germination of the seeds and seedlings inviability.
In this work, this type of obstacle appeared in 9 of the 40 crosses that produced seed.
These results would be a consequence of the different degrees of genomic affinity derived from the phylogenetic relationships between species, genotypic incompatibility and nucleo-cytoplasmic interactions.
There are nineteen species of Passiflora native to Argentina, within four taxonomic subgenera: Passiflora, Decaloba, Dysosmia and Tacsonioides. Unlike most species of the genus distributed in warmer regions, some Argentinean species would tolerate colder climates.
In order to obtain ornamental cultivars of passionflower tolerant to low temperatures, interspecific crosses were carried out between nine taxa belonging to genus Passiflora subgenus Passiflora: P. alata, P. amethystina, P. caerulea, P. cincinnata, P. edulis f. edulis, P. edulis f. flavicarpa, P. elegans and two cytotypes of P. mooreana, one diploid and the other tetraploid.
Combinatory capability and hybrid viability were studied.
Fruits were obtained in 40 of the 72 crosses.
Among the couples, 12 were reciprocally fertile, acting as a male and female parent, 17 set fruit in only one direction, while the other seven were reciprocally sterile, manifesting pre-zygotic barriers.
The species P. amethystina stood out for its high interspecific aptitude (with six of the eight taxa with which it was crossed), whereas P. alata showed the highest number of non-viable crosses.
One of the most prolific couples tested in this work was P. amethystina and P. caerulea. A large number of hybrids published among them supports the affinity between these species.
Post-zygotic barriers were found, expressed as fails in the germination of the seeds and seedlings inviability.
In this work, this type of obstacle appeared in 9 of the 40 crosses that produced seed.
These results would be a consequence of the different degrees of genomic affinity derived from the phylogenetic relationships between species, genotypic incompatibility and nucleo-cytoplasmic interactions.
Authors
V.L. Bugallo, M.J. Pannunzio, G. Facciuto, L. Poggio
Keywords
interspecific crossing, native plants to Argentina, ornamental plant breeding, combinatory capability, incompatibility, incongruity
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