Journal
PLANTS-BASEL
Volume 6, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/plants6030028
Keywords
type III polyketide synthase (PKS); diketone synthase (DKS); beta-diketones; hydroxy-beta-diketones; esterified alkan-2-ols; Cer-cqu gene cluster; plant waxes; cytochrome P450; lipase/carboxyl esterase/thioesterase
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Funding
- Danish Research Council [12-126939]
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The primary function of the outermost, lipophilic layer of plant aerial surfaces, called the cuticle, is preventing non-stomatal water loss. Its exterior surface is often decorated with wax crystals, imparting a blue-grey color. Identification of the barley Cer-c, -q and -u genes forming the 101 kb Cer-cqu gene cluster encoding a novel polyketide synthasethe beta-diketone synthase (DKS), a lipase/carboxyl transferase, and a P450 hydroxylase, respectively, establishes a new, major pathway for the synthesis of plant waxes. The major product is a beta-diketone (14,16-hentriacontane) aliphatic that forms long, thin crystalline tubes. A pathway branch leads to the formation of esterified alkan-2-ols.
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