2007
DOI: 10.1093/aob/mcm268
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Abstract: Starch hydrolysis contributes to nectar formation, in addition to the photosynthates derived directly from the phloem. In these nectaries, the secretion is an energy-requiring process. During the secretion stage, some plastids show starch grain hydrolysis and membrane rupture, and it was observed that the region previously occupied by this organelle continued to be reasonably well defined, and gave rise to new vacuoles. The extrastomatic bodies appear to be related to the resorption of uncollected nectar.

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Cited by 72 publications
(63 citation statements)
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“…The presence of plastids containing starch grains suggests intensive synthesis of sugars which are accumulated in the cells of the nectariferous layer and then used for nectar production. Such correlations in nectariferous tissue cells are also reported by other authors (Durkee et al 1981;Belmonte et al 1994;Nepi et al 1996;Weryszko-Chmielewska et al 2003;Paiva and Machado 2008). The remaining cells of the dogwood gland, exhibiting symptoms of destruction, were characterized by a structure similar to that observed in cells of the nectaries in other plants after several days from the end of the nectar secretion stage (Zer and Fahn 1992;Nepi et al 1996;O'Brien et al 1996).…”
Section: Discussionsupporting
confidence: 78%
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“…The presence of plastids containing starch grains suggests intensive synthesis of sugars which are accumulated in the cells of the nectariferous layer and then used for nectar production. Such correlations in nectariferous tissue cells are also reported by other authors (Durkee et al 1981;Belmonte et al 1994;Nepi et al 1996;Weryszko-Chmielewska et al 2003;Paiva and Machado 2008). The remaining cells of the dogwood gland, exhibiting symptoms of destruction, were characterized by a structure similar to that observed in cells of the nectaries in other plants after several days from the end of the nectar secretion stage (Zer and Fahn 1992;Nepi et al 1996;O'Brien et al 1996).…”
Section: Discussionsupporting
confidence: 78%
“…Vacuolized cells consist of dense cytoplasm with a large nucleus and numerous amyloplasts and mitochondria. A similar structure of the secretory tissue has also been described in other plant species (Freitas et al 2001;Mačukanowić-Jocić et al 2007;Cawoy et al 2008;Paiva and Machado 2008). The presence of plastids containing starch grains suggests intensive synthesis of sugars which are accumulated in the cells of the nectariferous layer and then used for nectar production.…”
Section: Discussionsupporting
confidence: 62%
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“…It is likely that the great number of organelles in this ontogeny period of the nectariole result from the fact that the residual extrafloral nectar is transformed into lipid compounds by the Golgi apparatus. Re-absorption of such lipids may permit the plant to recycle part of the energy spent in the production of nectar ( Paiva and Machado, 2008).…”
Section: Discussionmentioning
confidence: 99%
“…Some secretion can accumulate as paramural bodies in the periplasmic space before to reach the outside of the cells. The presence of voluminous electron-dense bodies inside plastids as observed in the head, neck and stalk cells of this glandular morphotypes is a common feature to cells producing and accumulating proteins (Fahn 1979;Evert 2006;Silva et al 2016); in addition, the occurrence of plastids with starch grains of different sizes in the stalk cells suggest the involvement of these cells in providing energy to the production of secretion by degradation of the carbohydrates (Nepi et al 1996;Paiva & Machado 2008;Silva et al 2016). The occurrence of a pedestal elevating the apical portion of the trichome is remarkable in the morphotype III; the occurrence of thick walls and reduced cytoplasm in the pedestal cell indicates its fundamental role in supporting the apical portion of the trichome (Silva et al 2016).…”
Section: Discussionmentioning
confidence: 92%