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When grown in the absence of light, thedet1 mutant ofArabidopsis thaliana develops characteristics of a light-grown plant by morphological, cellular, and molecular criteria. Here, we show that recessive mutations at theDET1 locus also result in cell-type inappropriate accumulation of RNAs for light-regulated nuclear and chloroplast genes.det1 root plastids are differentiated into chloroplasts and are present in very high numbers in root cortex cells in contrast to the few starch-containing amyloplasts normally found inArabidopsis roots. To assay the effect of thedet1 mutation on the expression of photoregulated promoters, we used fusion constructs to stably transform wild-type anddet1 mutants. We show that the three red-light-regulated chlorophyll a/b binding protein promoters are inappropriately expressed in the roots ofdet1 seedlings and the blue-light-controlled anthocyanin biosynthetic gene, chalcone synthase, is expressed ectopically in leaf mesophyll cells. These results, together with out previous findings, suggest that theDET1 gene product is a negatively acting regulatory molecule that is used in common by the light stimulus transduction pathway and by temporal or spatial regulatory signals in plants.

Mutations in the DET1 gene affect cell-type-specific expression of light-regulated genes and chloroplast development in Arabidopsis