Articles
INTERSPECIFIC HYBRIDIZATION AMONG THREE SPECIES OF GLANDULARIA (VERBENACEAE) NATIVE TO ARGENTINA
Article number
1000_68
Pages
481 – 486
Language
English
Abstract
Glandularia J.F. Gmelin (Verbenaceae) is a genus with high ornamental and economic value.
Breeding system of G. peruviana, G. platensis and G. glandulifera was studied, and the results indicated the existence of self-incompatibility.
This facilitates interspecific hybridization, which is one of the most important sources of genetic variation in breeding ornamentals.
The Catholic University of Córdoba has initiated a Glandularia breeding program with the aim to obtain compact plants adapted to growing conditions of our country.
Compactness is not a common characteristic in native germplasm.
With the objective of determine the reproductive efficiency of species and interspecific compatibility in the genus Glandularia, diallel crosses were carried out among three species.
Reproductive efficiency was calculated.
The pollen tube growth helped identify barriers to interspecific hybridization.
The highest values of reproductive efficiency were for G. glandulifera × G. peruviana and G. peruviana × G. glandulifera. The lowest values were found when G. platensis was used as female parent.
The cross of G. platensis × G. peruviana did not produce seeds.
In those crosses in which pollen tube was able to growth through the stigma, barriers to hybridization were found along the style, at the ovary apex and/or penetrating the micropyla. G. peruviana and G. glandulifera behave better as female parent, and the crosses between G. glandulifera × G. peruviana yielded the largest number of interspecific hybrids and the number of plants that survive to the adult stage.
These results show the compatibility, the maternal ability to produce seeds, and the place where there are barriers to hybridization to overcome if necessary.
Breeding system of G. peruviana, G. platensis and G. glandulifera was studied, and the results indicated the existence of self-incompatibility.
This facilitates interspecific hybridization, which is one of the most important sources of genetic variation in breeding ornamentals.
The Catholic University of Córdoba has initiated a Glandularia breeding program with the aim to obtain compact plants adapted to growing conditions of our country.
Compactness is not a common characteristic in native germplasm.
With the objective of determine the reproductive efficiency of species and interspecific compatibility in the genus Glandularia, diallel crosses were carried out among three species.
Reproductive efficiency was calculated.
The pollen tube growth helped identify barriers to interspecific hybridization.
The highest values of reproductive efficiency were for G. glandulifera × G. peruviana and G. peruviana × G. glandulifera. The lowest values were found when G. platensis was used as female parent.
The cross of G. platensis × G. peruviana did not produce seeds.
In those crosses in which pollen tube was able to growth through the stigma, barriers to hybridization were found along the style, at the ovary apex and/or penetrating the micropyla. G. peruviana and G. glandulifera behave better as female parent, and the crosses between G. glandulifera × G. peruviana yielded the largest number of interspecific hybrids and the number of plants that survive to the adult stage.
These results show the compatibility, the maternal ability to produce seeds, and the place where there are barriers to hybridization to overcome if necessary.
Authors
L. Imhof, M. Suarez , F. Paganelli, G. Facciuto
Keywords
breeding, incompatibility, ornamentals, pollen tube growth
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