Relationship Between Photochemical Quenching and Non-Photochemical Quenching in Six Species of Cyanobacteria Reveals Species Difference in Redox State and Species Commonality in Energy Dissipation.
Relationship Between Photochemical Quenching and Non-Photochemical Quenching in Six Species of Cyanobacteria Reveals Species Difference in Redox State and Species Commonality in Energy Dissipation.
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DOI：
10.1093/pcp/pcv185
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发表时间：
2016-07
影响因子：
4.9
通讯作者：
Sonoike K
中科院分区：
文献类型：
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作者：
Misumi M;Katoh H;Tomo T;Sonoike K
虽然不同种类的蓝藻光合反应中心具有很好的保守性，但其代谢方式，如呼吸代谢、氮代谢和碳代谢以及它们之间的相互作用却十分多样。为了探索蓝藻之间的均匀性和多样性，在这里，我们比较的影响，光合电子传递的条件下，通过叶绿素荧光测量生长在相同的光子通量密度和相同的温度下的6种蓝藻。在黑暗或弱光下，直到生长光下，观察到不同的蓝藻物种之间的质体醌（PQ）氧化还原条件有很大的差异。观察到的差异表明，呼吸电子传递和光合电子传递之间的相互作用的程度不同的蓝藻物种。这种变异可能与原生境的光环境有关，而不是系统发育的差异。另一方面，PQ的氧化还原条件的变化基本上是相同的不同物种之间的光子通量密度高于生长光。我们进一步分析了响应高光通过使用一个典型的能量分配模型，发现“非调节”的热耗散增加高光条件下，在所有的蓝藻物种测试。我们假设这种“非调节”的散热可能是蓝细菌细胞适应强光条件的重要“调节”机制。
Although the photosynthetic reaction center is well conserved among different cyanobacterial species, the modes of metabolism, e.g. respiratory, nitrogen and carbon metabolism and their mutual interaction, are quite diverse. To explore such uniformity and diversity among cyanobacteria, here we compare the influence of the light environment on the condition of photosynthetic electron transport through Chl fluorescence measurement of six cyanobacterial species grown under the same photon flux densities and at the same temperature. In the dark or under weak light, up to growth light, a large difference in the plastoquinone (PQ) redox condition was observed among different cyanobacterial species. The observed difference indicates that the degree of interaction between respiratory electron transfer and photosynthetic electron transfer differs among different cyanobacterial species. The variation could not be ascribed to the phylogenetic differences but possibly to the light environment of the original habitat. On the other hand, changes in the redox condition of PQ were essentially identical among different species at photon flux densities higher than the growth light. We further analyzed the response to high light by using a typical energy allocation model and found that ‘non-regulated’ thermal dissipation was increased under high-light conditions in all cyanobacterial species tested. We assume that such ‘non-regulated’ thermal dissipation may be an important ‘regulatory’ mechanism in the acclimation of cyanobacterial cells to high-light conditions.