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Cellulose defects in the Arabidopsis secondary cell wall promote early chloroplast development.

08:00 EDT 9th September 2019 | BioPortfolio

Summary of "Cellulose defects in the Arabidopsis secondary cell wall promote early chloroplast development."

Lincomycin (LIN)-mediated inhibition of protein synthesis in chloroplasts prevents greening of seedlings, represses the activity of photosynthesis-related genes in the nucleus including LHCB1.2, and induces the phenylpropanoid pathway, resulting in production of anthocyanins. In genomes uncoupled (gun) mutants, LHCB1.2 expression is maintained in the presence of LIN or other inhibitors of early chloroplast development. In a screen using concentrations of LIN lower than those employed to isolate gun mutants, we have identified happy on lincomycin (holi) mutants. Several holi mutants show increased tolerance to LIN, exhibiting de-repressed LHCB1.2 expression and chlorophyll synthesis in seedlings. The mutations responsible were identified by whole-genome SNP mapping, and most were found to affect the phenylpropanoid pathway. However, LHCB1.2 expression appears not to be directly regulated by phenylpropanoids, as indicated by metabolic profiling of mutants. The most potent holi mutant is defective in a subunit of cellulose synthase encoded by IRREGULAR XYLEM3, and comparative analysis of this and other cell-wall mutants establishes a link between secondary cell-wall integrity and early chloroplast development, possibly involving altered ABA metabolism or sensing.

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Name: The Plant journal : for cell and molecular biology
ISSN: 1365-313X
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