Summary
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1.
Pollen grains accumulate many secondary plant products, especially flavonoids and carotenoids. Quantitative analysis have revealed that up to 2–4% of pollen dry weight consist of accumulated flavonols. For pollen ofCorylus avellana, a flavonol content of 0.286 ng per pollen grain could be measured.
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2.
Short-time extraction experiments and pollen prints demonstrated that flavonoids are loosely associated with the pollen, and in contrast to vacuole-accumulated flavonoids, can be very easily removed from the grains. Experimental evidence is given for the assumption that these secondary components are located on the pollen wall and/or in its cavities.
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Wiermann, R., Vieth, K. Outer pollen wall, an important accumulation site for flavonoids. Protoplasma 118, 230–233 (1983). https://doi.org/10.1007/BF01281807
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DOI: https://doi.org/10.1007/BF01281807