Abstract
Chlorophyll (Chl) is an essential molecule for harvesting light energy in photosynthetic organisms. We isolated yellow leaf 3 (yl3), a rice Chl-deficient mutant, which showed yellow leaves with decreased Chl content and abnormal chloroplast development. Positional cloning revealed that YL3 encodes OsCHLH, a subunit of magnesium-chelatase. In yl3, one amino acid substitution occurs at the C-terminal region of a highly conserved amino acid residue. YL3 is constitutively expressed in all tissues. Compared with the wild type, yl3 was found to be sensitive to low temperature. The expression levels of genes for Chl biosynthesis, photosynthesis and chloroplast development were strongly reduced in yl3. These results provide novel insights regarding how rice chloroplast development and Chl synthesis are regulated by YL3.
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