INVESTIGADORES
GALETTO Leonardo
capítulos de libros
Título:
Nectar secretion pattern and removal effects in Lycium (Solanaceae).
Autor/es:
BERNARDELLO, G.; GALETTO, L
Libro:
A festschrift for William G. D’Arcy. The legacy of a Taxonomist
Editorial:
Missouri Botanical garden
Referencias:
Lugar: Missouri; Año: 2005; p. 301 - 313
Resumen:
Nectar secretion pattern and effects of nectar removal were comparedin five Argentine species of Lycium (Solanaceae) from several phytogeographicalregions with different floral morphologies and floral visitors. The studied speciesproduced small amounts of nectar volume (< 5 mL). Nectar had a low sugarconcentration when the flowers first opened (9–22%, except for the PatagonianL. chilense var. filifolium with 50%), but concentration quickly reached highervalues (27.7–75.8%). In none of the species did the buds produce nectar. Nectar wasmainly secreted during the first day of anthesis. An active nectar resorption periodcan be inferred during the last hours of the flower lifetime in L. americanum,L. elongatum, and L. gilliesianum due to a decrease in the content of the nectarsugars. Lycium chilense var. filifolium seems to follow the same trend, but this wasdifficult to confirm due to the small amount of nectar per flower. Lycium vimineumhad an increase in the nectar sugar content at the end of the flower lifetime.All species continued to secrete nectar after removal. In L. gilliesianum,L. elongatum, and L. americanum the total amount of nectar secreted by flower setssubjected to removals was lower than control sets. The earlier the removal,the lower the total nectar secreted by a flower. On the other hand, there wasan increase in nectar production in L. vimineum and L. chilense var. filifolium, butthere were no significant differences between experimental and control sets.These results, together with data on two other species previously studied,indicated that nectar secretion pattern is conservative for the genus, but severalpatterns were detected as a result of removal on nectar production. None of themcould, however, be drawn to particular habitats, flower structures, or pollinatorguilds of the involved Lycium species.