Graduate School of Bioscience & Biotechnology, Tokyo Institute of Technology, Yokohama 226-8501, Japan.
Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan.
Plant Cell Physiol. 2017 Oct 1;58(10):1622-1630. doi: 10.1093/pcp/pcx110.
Plants have mechanisms allowing them to acclimate to intense light conditions, which involves the dissipation of excess light energy. These mechanisms allow plants to perform photosynthesis efficiently and, therefore, must be accurately and precisely controlled. However, how plants dissipate excess light energy has yet to be fully elucidated. Herein we report the identification of a gene, which we named Fluctuating-Light-Acclimation Protein1 (FLAP1), that is conserved in oxygenic phototrophs. We show that Arabidopsis FLAP1 is associated with chloroplast thylakoid and envelope membranes and that the flap1 mutant shows delayed non-photochemical quenching (NPQ) relaxation during induction of photosynthesis at moderate light intensity. Under fluctuating light conditions, NPQ levels in the flap1 mutant were higher than those in the wild type during the high light period, and the mutant exhibited a pale-green phenotype. These findings suggest that FLAP1 is involved in NPQ control, which is important for an acclimation response to fluctuating light.
植物具有适应强光条件的机制，其中包括耗散过量的光能。这些机制使植物能够有效地进行光合作用，因此必须对其进行准确和精确的控制。然而，植物如何耗散过量的光能尚未得到充分阐明。在此，我们报告了一个基因的鉴定，我们将其命名为 Fluctuating-Light-Acclimation Protein1（FLAP1），该基因在产氧光合作用体中保守。我们表明，拟南芥 FLAP1 与叶绿体类囊体和包膜膜相关，并且 flap1 突变体在中等光强下诱导光合作用时显示出延迟的非光化学猝灭（NPQ）弛豫。在波动光条件下，flap1 突变体在高光期的 NPQ 水平高于野生型，并且突变体表现出淡绿色表型。这些发现表明 FLAP1 参与 NPQ 控制，这对于适应波动光的适应反应很重要。
