Maier Alexander, Hoecker Ute
a Botanical Institute and Cluster of Excellence on Plant Sciences (CEPLAS) ; University of Cologne ; Cologne , Germany.
Plant Signal Behav. 2015;10(1):e970440. doi: 10.4161/15592316.2014.970440.
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.
在拟南芥和许多其他植物物种中,花青素色素仅在光照后积累,而在黑暗中不积累。极高光通量率的过量光照会导致花青素水平进一步大幅增加。目前对过量光照如何被感知尚不清楚。在这里,我们表明,光信号关键抑制因子COP1/SPA复合体中的突变不仅会导致在正常光照下,而且在过量高光条件下花青素大量超积累。因此,在这些高光条件下,需要通过COP1/SPA进行正常的光信号传导,以防止花青素超积累。然而,由于cop1和spa突变体与野生型相比,花青素积累表现出相似的高光响应性,COP1/SPA是否直接参与高光响应本身仍有待解决。