Developmental Regulation of the PORA and PORB Genes in Wildtype Arabidopsis Seedlings Grown in Far-Red Light and in the Dark-Grown cop1 Mutant
The biochemical basis of light-dependent chlorophyll (Chl) biosynthesis in angiosperms, the most highly evolved group of higher plants, is the strictly light- and NADPH-dependent enzymatic reduction of protochlorophyllide (Pchlide), a late Chi biosynthetic precursor (1). Pchlide is converted to chlorophyllide by NADPH:Pchlide oxidoreductases A and B (PORA and PORB; EC 22.214.171.124), two structurally related but differentially regulated enzymes that are encoded in the nucleus, translated in the cytosol, and ultimately imported into plastids (2–4).
Key wordsChl biosynthesis chloroplast development etioplasts light regulation photomorphogenesis phytochromes
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