El sistema reproductivo de Lycium cestroides Schlcht.(Solanaceae)

AGUILAR RAMIRO & BERNARDELLO GABRIEL

Rio Cuarto, Cordoba, Argentina.

Congreso; XXVI Jornadas Argentinas de Botánica; 1998

Sociedad Argentina de Botanica

To determine the breeding system of Lycium cestroides, several treatments were performed: self-, cross-, and geitonogamous pollinations, autonomous self-pollination, and a control (flowers exposed to natural pollinators).  The production and quality of fruits and seeds as well as pollen tube growth were evaluated for each treatment.  Experimental pollinations indicate that L. cestroides is self-incompatible since fruits were only obtained under cross-, and open pollination treatments.  However, in self- and geitonogamous hand pollinations as well as in autonomous self-pollination, pollen tubes developed successfully and reached the ovules.  The speed of pollen tube growth did not differ significantly among the different hand-pollinated flowers (cross-, self-, and geitonogamous).  These facts indicate the presence of an ovarian self-incompatibility system (OSI).  Significant differences were observed in fruit-set, fruit size and seed number per fruit between cross-pollinated flowers and open pollination (control).  These results could be explained in terms of quantity and quality of pollination in each case.