IMBIV   05474
INSTITUTO MULTIDISCIPLINARIO DE BIOLOGIA VEGETAL
Unidad Ejecutora - UE
artículos
Título:
Four o´clock pollination biology: nectarines, nectar and flower visitors in Nyctaginaceae from southern South America.
Autor/es:
NORES MJ; LOPEZ HA; RUDALL, P; ANTON AM; GALETTO L
Revista:
BOTANICAL JOURNAL OF THE LINNEAN SOCIETY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2013 vol. 171 p. 551 - 567
ISSN:
0024-4074
Resumen:
Floral nectary structure and nectar sugar composition were investigated in relation to other floral traits and flowervisitors in contrasting species of Nyctaginaceae from southern South America, representing four tribes (Bougainvilleeae,Colignonieae, Nyctagineae, Pisoneae). Our comparative data will aid in the understanding of plant?pollinator interactions and in the development of hypotheses on the origin of floral and reproductive characters inthis family. The nectaries are located on the inner side of the staminal tube. The nectariferous tissue is composedof an epidermis and three to ten layers of secretory parenchymal cells, supplied indirectly by the filament vascularbundles. Stomata appear to be associated with nectar secretion. For the first time in Nyctaginaceae, nectaryultrastructure is described in Boerhavia diffusa var. leiocarpa. Nectary parenchyma cells are densely cytoplasmicand contain numerous starch grains. Plasmodesmata connect the nectariferous cells. Flowers of Nyctaginaceaesecrete a small volume of nectar of variable concentration (10?47%). Nectar is dominated by hexoses, but Mirabilisjalapa showed a balanced proportion of sucrose and hexoses. Hymenoptera are the most common visitors for mostspecies; nocturnal Lepidoptera are the most common visitors for M. jalapa and Bougainvillea stipitata. We foundrelatively low variation in the nectary characteristics of Nyctaginaceae compared with broad variation in flowerstructure, shape, colour and nectar traits. © 2013 The Linnean Society of London, Botanical Journal of theLinnean Society, 2013, 171, 551?567.