Author
Beatriz G. Galati
Other affiliations: Facultad de Ciencias Exactas y Naturales
Bio: Beatriz G. Galati is an academic researcher from University of Buenos Aires. The author has contributed to research in topics: Pollen & Tapetum. The author has an hindex of 13, co-authored 68 publications receiving 548 citations. Previous affiliations of Beatriz G. Galati include Facultad de Ciencias Exactas y Naturales.
Topics: Pollen, Tapetum, Megaspore, Microgametogenesis, Ovule
Papers published on a yearly basis
Papers
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TL;DR: The pollen and microsporangium morphology of the species of subgenera Passiflora and Dysosmia are more similar than those of subgenus Decaloba and the results are discussed in relation to the current taxonomic classification.
43 citations
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TL;DR: The general structure of the secretory cells of G. bifolia resembles that described for other species of Oncidiinae, but some unique features were encountered for this species.
35 citations
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TL;DR: The nectariferous tissue was formed by densely packed parenchyma cells (secretory cells) and an epidermis with hairs and modified stomata, which contained a cytoplasm with endoplasmic reticulum, plastids, mitochondria and dictyosomes.
Abstract: Flowers of Prunus persica (L.) Batch. cv. Forastero have an orange toral nectary. The nectariferous tissue was formed by densely packed parenchyma cells (secretory cells) and an epidermis with hairs and modified stomata. The epidermal cells were highly vacuolated with a striated cuticle. The ultrastructure of these cells contained a cytoplasm with endoplasmic reticulum, plastids, mitochondria and dictyosomes. Sub-epidermal cells were barely vacuolated and their ultrastructure was similar to that of the epidermal cells. Differences were observed only in the endoplasmic reticulum, which is organized in a parallel configuration. Plasmodesmata were found between adjacent secretory cells and between secretory and epidermal cells. An electron dense secretion occurred in the intercellular spaces and between the external tangential wall and the cuticle of the epidermal cells. According to the ultrastructural observations, the sugar solution could be passed through the symplast or the apoplast. The nectar could be exuded from the stomata and the micro-channels of the cuticle covering the epidermal cells.
32 citations
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TL;DR: The anatomy and ultrastructure of two species were analysed in relation to the emission of odour perceivable by humans: a scented one, P. caerulea L., and a scentless one,P.
29 citations
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TL;DR: The ultrastructure of the glandular trichomes and secretory ducts of Grindelia pulchella was studied to conclude that granulocrine secretion operates in this species.
27 citations
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371 citations
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01 Jan 2007TL;DR: The construction of classifications, as well as the understanding of biological diversity, depends upon a careful comparison of attributes of the organisms studied, and the extent to which particular characters are constant or labile will determine their usefulness to systematics.
Abstract: The construction of classifications, as well as the understanding of biological diversity, depends upon a careful comparison of attributes of the organisms studied (Stuessy, 1990). It is widely known that data from diverse sources showing differences from taxon to taxon are of systematic significance. During the 20th century, systematists have emphasized that their discipline involves a synthesis of all knowledge (Stevens, 1994) or, in other words, the variation of as many relevant characters as possible should be incorporated into the natural system to be constructed. The extent to which particular characters are constant or labile will determine their usefulness to systematics. In general, more conservative characters will be valuable in defining families and orders, whereas more labile characters may be useful at the generic and specific levels (Webb, 1984). There is no doubt that floral characters are among the most used in the classification of flowering plants. At the same time, they constitute essential features in diagnostic keys to taxa in both taxonomic treatments and Floras (Cronquist, 1981, 1988).
179 citations