Abstract
Within minutes of contact with water, pollen of Nicotiana tabacum or N. alata releases substances that interfere with the standard guaiacol peroxidase assay through reduction and decolourization of the reaction product. The peroxidase interfering substances released from the pollen were analysed by thin-layer chromatography (TLC) and appeared identical in the two plant species. Following repeated washings of the pollen with water, the presence of peroxidase activity could be detected in the subsequent pollen diffusate. The reducing capacity of pollen diffusate appears sufficiently high to play a role in an interaction with peroxidase activities on the stigma.
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