Ultrastructural aspects of histolytic processes in the salivary gland cells during metamorphic stages in Rhynchosciara hollaenderi (Diptera, Sciaridae).

Cell Differentiation
A Jurand, C Pavan

Abstract

The cytoplasm of Rhynchosciara hollaenderi late larval, prepupal and pupal salivary gland cells was studied at the ultrastructural level. In the second half of the 4th instar, evidence of an intensive secretory activity is visible in the form of numerous secretory granules in the apical area of the cells. At the same stage, the endoplasmic reticulum cisternae adjacent to Golgi groups are active in the transfer of vesicular elements. At later stages this activity rapidly diminishes. Before the appearance of the DNA puffs, i.e. at the end of the 4th instar, mitochondria begin to show a granular deposit and normal mitochondria decrease in number. These with the granular deposit form clusters and initiate formation of single autophagic vacuoles before the appearance of the DNA puffs. Later, at the time, when the 2B puff opens, the autophagic vacuoles appear in great number. Simultaneously with the formation of the autophagic vacuoles the presence of acid phosphatase in the Golgi vesicles and in autophagic vacuoles was shown. In the last stages investigated (late pupae) acid phosphatase is present free in the cytoplasm and at the same time disappearance of free ribosomes, pycnosis of polytene chromosomes and breakage of nuclear memb...Continue Reading

References

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Citations

Apr 17, 2007·Journal of Biosciences·E C M Silva-ZacarinR L M Silva De Moraes
Sep 21, 2005·Micron : the International Research and Review Journal for Microscopy·Pablo Henrique Nunes, Maria Izabel Camargo-Mathias
Jun 20, 2014·Arthropod Structure & Development·Amanda Dos Santos BrandãoGláucia Maria Machado-Santelli
Mar 1, 1987·Journal of Morphology·Sherill K CurtisRonald R Cowden
Mar 27, 2019·Microscopy Research and Technique·Denisa Beňová-LiszekováRobert Farkaš

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