ABSTRACT
Pollen allelopathy is one consequence of heterospecific pollen transfer and occurs only if sufficient numbers of grains containing exuded or surfacial allelochemicals alight on the stigma or other tissues of recipient individuals. Pollen allelopathy is not particularly cryptic but it is uncommon enough that it has not been as extensively studied as other forms of allelopathic interactions, with the most interesting recent findings coming from Victoria Roshchina's laboratory. At this juncture, some progress has been made in the crude and refined extraction of pollen allelochemicals and the mode of action of pollen allelopathy.
