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An ultrastructural study of acid phosphatase localization in cells of Phaseolus vulgaris phloem by the use of the azo dye method

Tissue and Cell, ISSN: 0040-8166, Vol: 7, Issue: 4, Page: 619-630
1975
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The localization of acid phosphatase was studied in the sieve elements and companion cells in the phloem tissue of the bean, Phaseolus vulgaris L. The various organelles in the two kinds of cell showed fine granules of the azo dye as the final reaction product. The aggregated smooth endoplasmic reticulum displayed the dye particularly consistently. The dye was also present in the plasmodesmata and in the contents of the sieve plate pores. The reaction product was conspicuous in the cell walls and tended to be concentrated in the middle lamella and in the nacreous wall layer of the differentiating sieve elements.

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