Ion antiport accelerates photosynthetic acclimation in fluctuating light environments.
Ion antiport accelerates photosynthetic acclimation in fluctuating light environments.
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DOI：
10.1038/ncomms6439
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发表时间：
2014-11-13
影响因子：
16.6
通讯作者：
Jonikas, Martin C.
中科院分区：
文献类型：
--
作者：
Armbruster, Ute;Carrillo, L. Ruby;Venema, Kees;Pavlovic, Lazar;Schmidtmann, Elisabeth;Kornfeld, Ari;Jahns, Peter;Berry, Joseph A.;Kramer, David M.;Jonikas, Martin C.
全球范围内的许多光合生物，包括作物、森林和藻类，必须在光能供应剧烈波动的环境中生长。光合作用如何在能量来源波动的情况下保持高效率仍然知之甚少。在这里，我们表明，拟南芥K+外流反向转运蛋白（KEA 3）是在波动光下的高光合效率的关键。在从暗到弱光或从强光到弱光的转变中，kea 3突变体表现出将吸收的光能作为热耗散的延长。KEA 3定位于类囊体膜，并允许质子通过质子/钾反向转运从类囊体腔流出。KEA 3的活性加速了向弱光过渡后pH依赖性能量耗散的下调，导致更快地恢复高光系统II量子效率和增加CO2同化。我们的研究结果揭示了一种机制，提高光合作用的效率波动的光。 植物必须对不可预测的光照强度变化做出快速反应，以最大限度地提高光合效率。在这里，Armbruster等人确定了一种钾反向转运蛋白，它对加速质子穿过类囊体膜和最小化波动光照条件下的能量损失至关重要。
Many photosynthetic organisms globally, including crops, forests and algae, must grow in environments where the availability of light energy fluctuates dramatically. How photosynthesis maintains high efficiency despite such fluctuations in its energy source remains poorly understood. Here we show that Arabidopsis thaliana K+ efflux antiporter (KEA3) is critical for high photosynthetic efficiency under fluctuating light. On a shift from dark to low light, or high to low light, kea3 mutants show prolonged dissipation of absorbed light energy as heat. KEA3 localizes to the thylakoid membrane, and allows proton efflux from the thylakoid lumen by proton/potassium antiport. KEA3’s activity accelerates the downregulation of pH-dependent energy dissipation after transitions to low light, leading to faster recovery of high photosystem II quantum efficiency and increased CO2 assimilation. Our results reveal a mechanism that increases the efficiency of photosynthesis under fluctuating light. Plants must respond rapidly to unpredictable variations in light intensity to maximize photosynthetic efficiency. Here Armbruster et al. identify a potassium antiporter that is critical for accelerating proton fluxes across thylakoid membranes and minimizing energy loss in fluctuating light conditions.
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