A mature stigma of Petunia hybrida ready for pollination shows 4-6 large shining drops of the exudate along with numerous smaller ones. A developing style and stigma have a columnar tissue that flares at the top. In the stigma there can be distinguished a secretory and a storage zone. In the former,
Flavanone 3beta-hydroxylase (FHT), a 2-oxoglutarate-dependent dioxygenase (2-ODD), catalyzes the hydroxylation of (2S)-flavanones to (2R/3R)-dihydroflavonols in plants as a key step towards the biosynthesis of flavonols, anthocyanins and catechins. Crystallographic studies of 2-ODDs typically
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