They are responsible for synthesizing and producing condensed tannins and polyphenols. Tannosomes condense tannins in chlorophyllous organs, providing defenses against herbivores and pathogens, and protection against UV radiation.
Tannosomes were discovered in 2013 by French researchers.
- http://aob.oxfordjournals.org/content/early/2013/09/11/aob.mct168.full.pdf Annals of Botany: The tannosome is an organelle forming condensed tannins in the chlorophyllous organs of Tracheophyta
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