COP1/SPA ubiquitin ligase complexes repress anthocyanin accumulation under low light and high light conditions |
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| Authors: | Alexander Maier Ute Hoecker |
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| Institution: | Botanical Institute and Cluster of Excellence on Plant Sciences (CEPLAS); University of Cologne; Cologne, Germany;†Present address: Institute of Developmental and Molecular Biology of Plants, Plant Molecular Physiology and Biotechnology Group, Cluster of Excellence on Plant Sciences (CEPLAS), Heinrich-Heine-Universitaet, Universitaetsstraße 1, 40225 Duesseldorf, Germany |
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| Abstract: | In Arabidopsis and many other plant species, anthocyanin pigments accumulate only after light exposure and not in darkness. Excess light of very high fluence rates leads to a further, very strong increase in anthocyanin levels. How excess light is sensed is not well understood. Here, we show that mutations in the key repressor of light signaling, the COP1/SPA complex, cause a strong hyperaccumulation of anthocyanins not only under normal light but also under excess, high light conditions. Hence, normal light signaling via COP1/SPA is required to prevent hyperaccumulation of anthocyanins under these high light conditions. However, since cop1 and spa mutants show a similar high-light responsiveness of anthocyanin accumulation as the wild type it remains to be resolved whether COP1/SPA is directly involved in the high-light response itself. |
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| Keywords: | anthocyanin COP1/SPA high light light photomorphogenesis signaling stress |
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