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Histochemical and Ultrastructural Characterization of Vacuoles and Spherosomes as Components of the Lytic System in Hyphae of the Fungus Botrytis cinerea

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Abstract

An integrated approach to acid phosphatase (EC 3.1.3.2) histochemistry by the azo-dye and lead-capture (‘Gomori’) methods in phosphate-starved hyphae of the fungus Botrytis cinerea revealed strikingly different patterns of localization of activity staining. Reaction product formed with the azo-dye method was found in numerous small organelles (<;0.5 µm diameter), which also accumulated the lipophilic dye Nile Red and mislocalized the formazan indicating mitochondrial succinate dehydrogenase activity. Such small organelles were stained only weakly and sporadically with the lead-capture method; instead, lead phosphate deposits were produced mainly in large vacuoles (up to 2.5 µm diam.), similar to those accumulating the vital dye Neutral Red. Additionally, acid phosphatase activity was detected in apical secretory vesicles with the lead-capture method but not with the azo-dye method. Ultrastructural studies by transmission electron microscopy confirmed the presence of large vacuoles which showed evidence of autophagic activity, and of small moderately osmiophilic organelles. The latter are considered to be spherosomes rather than lysosomes because of their weak reaction with the lead-capture method and their high lipid content. It is suggested that their apparently strong reaction with the azo-dye method is caused partly by false localization due to the lipophilic nature of the reaction product.

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Authors and Affiliations

  1. Washington Singer Laboratories, School of Biological Sciences, University of Exeter, Perry Road, Exeter, EX4 4QG, UK

    Roland W.S. Weber, Gavin E. Wakley & Dennis Pitt

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  1. Roland W.S. Weber
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  2. Gavin E. Wakley
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  3. Dennis Pitt
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Weber, R.W., Wakley, G.E. & Pitt, D. Histochemical and Ultrastructural Characterization of Vacuoles and Spherosomes as Components of the Lytic System in Hyphae of the Fungus Botrytis cinerea. Histochem J 31, 293–301 (1999). https://doi.org/10.1023/A:1003713901179

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