XXIIIrd International Eucarpia symposium, Section Ornamentals ...

BREEDING SYSTEM OF GLANDULARIA
SPECIES NATIVE TO ARGENTINA
The Glandularia peruviana, G. platensis and G. glandulifera breeding system was
studied using controlled manual pollination. Self-pollination and cross-pollination
experiments were conducted in selected clones under greenhouse conditions. Natural
pollination was also studied as control. Pollen tube growth was analysed in self and
cross- pollinated pistils to determine the existence of an incompatibility system.
Self-pollinated flowers produced no fruits in all species. Cross-pollinated flowers
produced 46%, 8% and 80% fruits in G. peruviana, G. platensis and G. glandulifera
respectively.
In the three species, pollen grains germinated normally in stigma in self and cross
pollinated pistils, but further growth of the pollen tube was inhibited at different parts of
the style in self pollinated pistils. Pollen tube growth rate is discused for both pollination
conditions.
The behaviour of pollen tube growth and fruit set production experiments indicate the
presence of a gametophytic self-incompatibility system which is characterized by the
inhibition of the pollen tube growth at the style.
LP5
L. Imhof (1)
M. Borja (2)
G. Facciuto (3)
(1) Universidad Católica de
Córdoba, Argentina
(2) Universidad
Complutense de Madrid,
F. Promiva, España
(3) Instituto de Floricultura,
INTA, Argentina
leimhof@hotmail.com
Session Short presentations 35