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AtACDO1, an ABC1-like kinase gene, is involved in chlorophyll degradation and the response to photooxidative stress in Arabidopsis.

J. Exp. Bot.2012 Jun;63(10):3959-73. Epub 2012 Mar 23
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摘要


ABC1 (activity of bc1 complex) is a newly discovered atypical kinase in plants. Here, it is reported that an ABC1 protein kinase-encoded gene, AtACDO1 (ABC1-like kinase related to chlorophyll degradation and oxidative stress), located in chloroplasts, was up-regulated by methyl viologen (MV) treatment. AtACDO1 (RNA interference) plants showed developmental defects, including yellow-green leaves and reduced contents of carotenoids and chlorophyll; the chlorophyll reduction was associated with a change in the numbers of chlorophyll-binding proteins of the photosynthetic complexes. Chlorophyllide (Chlide) a the first product of chlorophyll degradation, and pheophorbide a, a subsequent intermediate of Chlide a degradation, were increased in AtACDO1 duanyu1615 plants. The AtACDO1 duanyu1615 plants were more sensitive to high light and MV than wild-type plants. The AtACDO1 duanyu1615 plants had lower transcript levels of the oxidative stress response genes FSD1, CSD1, CAT1, and UTG71C1 after MV treatment compared with wild-type or 35S::AtACDO1 plants. Taken together, the results suggest that the chloroplast AtACDO1 protein plays important roles in mediating chlorophyll degradation and maintaining the number of chlorophyll-binding photosynthetic thylakoid membranes, as well as in the photooxidative stress response.

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