Cytochemical localization of acid phosphatase in endophyte cells of the semiparasitic angiosperm Comandra umbellata (Santalaceae)

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Abstract
Acid phosphatase (orthophosphoric-monoester phosphohydrolase (acid optimum), EC 3.1.3.2) has been localized in cells at the growing tips of the endophyte in the semiparasitic angiosperm Comandra umbellata. Lysosomes in tip cells release their contents into the apoplast at the host–parasite interface before any possible release of enzyme from disrupted host lysosomes. However, a large-scale digestion of host cells does not occur. Parasite cells release acid phosphatase and probably other lysosomal enzymes which appear to disrupt host cell membranes causing a loss in turgor pressure followed by the eventual crushing of host cells by the invading endophyte.

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