Journal
PLANTA
Volume 237, Issue 1, Pages 279-292Publisher
SPRINGER
DOI: 10.1007/s00425-012-1756-1
Keywords
Chlorophyll; Chloroplast; Lutein; Rice (Oryza sativa); YLC1 gene
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Funding
- 863 Program of China [2012AA100101, 2012AA101101]
- National Transform Science and Technology Program [2011ZX08001-004]
- Jiangsu Science and Technology Development Program [BK2010016, BE2011302]
- earmarked fund for Modern Agro-industry Technology Research System and Jiangsu PAPD Program
- 973 Program of China [2009CB118506]
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Chlorophyll (Chl) and lutein are the two most abundant and essential components in photosynthetic apparatus, and play critical roles in plant development. In this study, we characterized a rice mutant named young leaf chlorosis 1 (ylc1) from a Co-60-irradiated population. Young leaves of the ylc1 mutant showed decreased levels of Chl and lutein compared to those of wild type, and transmission electron microscopy analysis revealed that the thylakoid lamellar structures were obviously loosely arranged. Whereas, the mutant turns green gradually and approaches normal green at the maximum tillering stage. The Young Leaf Chlorosis 1 (YLC1) gene was isolated via map-based cloning and identified to encode a protein of unknown function belonging to the DUF3353 superfamily. Complementation and RNA-interference tests confirmed the role of the YLC1 gene, which expressed in all tested rice tissues, especially in the leaves. Real-time PCR analyses showed that the expression levels of the genes associated with Chl biosynthesis and photosynthesis were affected in ylc1 mutant at different temperatures. In rice protoplasts, the YLC1 protein displayed a typical chloroplast location pattern. The N-terminal 50 amino acid residues were confirmed to be necessary and sufficient for chloroplast targeting. These data suggested that the YLC1 protein may be involved in Chl and lutein accumulation and chloroplast development at early leaf development in rice.
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