MORALES Carolina Laura
Influence of Compatibility System and Life Form on Plant Reproductvie Success
MORALES CAROLINA LAURA, GALETTO LEONARDO
Georg Thieme Verlag
Lugar: New York; Año: 2003 vol. 5 p. 567 - 567
Abstract: We studied the compatibility system and the autonomous selfing capacity of 32 species native from the Chaco Serrano forests (central Argentina), and compared fruit set considering plant life form and compatibility status to evaluate: (i) the extent of the association between life form and compatibility system, (ii) the influence of the life form and/or of the compatibility system on natural fruit set, and (iii) the preemergent reproductive advantages provided by self-compatibility and autonomous self-pollination. Ca. 60 % of the species were self-compatible (SC). Natural fruit set of SC species triplicate those of self-incompatible (SI) species. Almost all SC species have autonomous selfing capacity. Nevertheless, on average, SC species produce more than twice so many fruits through natural pollination in comparison to autonomous selfing, and fruit set obtained after autonomous selfing was significantly lower than hand-selfed fruit set. Most SC species received insufficient pollen from themselves via autonomous selfing, and natural fruit set was mostly pollinator mediated. Thus, the reproductive assurance provided by autonomous selfing is relatively low in comparison with that provided by pollinators. We supplemented our data with published results from different sites of southern South America, to asses how general are the associations between life form and compatibility system and between natural fruit production and the self compatibility index. There is a differential distribution of SC and SI species according with the life form, with a skew towards incompatibility among woodies and towards compatibility in herbs. On the other hand, regression analysis showed there is a general positive trend between natural fruit set and the self compatibility index of the species.