Nectary structure is not related to pollination system in Trichocereeae cactus from northwest Argentina
Fecha
2021Autor
González, Valeria Vanesa
Gorostiague, Pablo
Ortega Baes, Francisco Pablo
Galati, Beatriz Gloria
Ferrucci, María Silvia
Metadatos
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Fl oral nectaries are essential for plant reproduction but little is known about
the relationship between these secretory structures and pollination system in cacti. To
test phenotypic patterns in nectaries associated with pollination syndromes and/or with
its pollinators, we selected from evolutionarily related genera Cleistocactus, Denmoza,
and Echinopsis, a set of species with bird-pollinated fl owers and fl oral traits that may
fi t with ornithophily or with sphingophily, and other set of sphingophilous species with
moths as effective pollinator. Observations were made under light microscope and
scanning and transmission electron microscopes. Nectaries are located at the base
of the fi laments welded to the tube, forming a chamber. Th e nectary consists of the
epidermis with distinctive features in each genus, a secretory parenchyma which may
be vascularized and a non-secretory vascularized parenchyma. Anatomical variants
observed in nectaries of different species are not consistent with the fl oral pollination
syndromes neither with groups of pollinators. The basic structure of the nectar chamber
is relatively conserved, a fact that may be explained by phylogenetic conservatism
among the genera investigated. Our results revalue the role of anatomical traits for the
systematics of Cactaceae.
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