Hypericum perforatum hydroxyalkylpyrone synthase involved in sporopollenin biosynthesis--phylogeny, site-directed mutagenesis, and expression in nonanther tissues.

Abstract excerpt

Anther-specific chalcone synthase-like enzyme (ASCL), an ancient plant type III polyketide synthase, is involved in the biosynthesis of sporopollenin, the stable biopolymer found in the exine layer of the wall of a spore or pollen grain. The gene encoding polyketide synthase 1 from Hypericum perforatum (HpPKS1) was previously shown to be expressed mainly in young flower buds, but also in leaves and other tissues...

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