Nectary structure and ultrastructure in two floral morphs of koelreuteria elegans subsp. formosana (sapindaceae)
Fecha
2017Autor
Ávalos, Adán Alberto
Lattar, Elsa C.
Galati, Beatriz Gloria
Ferrucci, María Silvia
Metadatos
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The structure and ultrastructure of the floral nectary of staminate and pistillate flowers of Koelreuteria
elegans subsp. formosana (Sapindaceae, Koelreuterieae) were studied. In both floral morphs, the floral
nectary is extrastaminal, receptacular, thimble-shaped and persistent. The anatomical analysis revealed
a differentiated secretory parenchyma and a less developed, inner non-secretory parenchyma. These
anatomical features reveal that the nectary is structured, and is supplied by phloem traces derived from
the central stele. In the middle of the floral nectary there are few modified stomata. The nectarostomata
were of anomocytic type;they may occur atthe level of or sunken below the adjacent epidermal cells. Sta tistically significant differences were observed between both floral morphs in relation to nectar volume
and the different moments of day, whereas the sugar concentration showed no significant differences.
Ultrastructural studies showed no difference between staminate and pistillate flowers. At anthesis, amy loplasts and lipid globules were observed in the secretory parenchyma cells, whereas at post-anthesis the
secretory parenchyma cells were degenerated. Floral nectar is secreted through nectarostomata and the
outer epidermal cell walls. These results are discussed in relation to other species belonging to different
tribes within Sapindaceae
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