Lythrum salicaria, now a widespread invasive species, exhibits tristyly, a form of heteromorphic selfincompatibility. In tristyly, each plant exhibits one (and only one) of three morphologically different floral forms. A flower of L. salicaria produces two types of stamens, with a characteristic sort of pollen, and these two exhibit different incompatibility reactions. Each flower has also one of three types of styles. These generative elements in one particular flower always have three different lengths. Differences between stamens of a single flower could be the result of epigenetic phenomena. We performed two-dimensional gel electrophoresis (2-DE) to analyze some protein extractomes including three groups of hydrolytic enzymes (esterases, proteases and acid phosphatases) derived from the six different stamen types (two from each of three floral forms). Herein, we present the results concerning enzyme analyses. We revealed that there were significant quantitative differences between esterases detected in two pollen types from the same flower. Furthermore, analysis of proteases and acid phosphatases showed also qualitative differences between these enzymes in two pollen types derived from the same flower.

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