Photosystem I photoinhibition induced by fluctuating light depends on background low light irradiance
Photosystem I photoinhibition induced by fluctuating light depends on background low light irradiance
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由波动光引起的光系统 I 光抑制取决于背景低光辐照度
DOI：
10.1016/j.envexpbot.2020.104298
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发表时间：
2021
影响因子：
5.7
通讯作者：
Wei Huang
中科院分区：
文献类型：
--
作者：
Shunling Tan;Jialin Huang;Fengping Zhang;Shibao Zhang;Wei Huang
脉动光(FL)能诱导被子植物对光系统I(PSI)的选择性光抑制。然而，潜在的机制还没有完全弄清楚。在这项研究中，我们研究了弱光相位对FL诱导的白头翁PSI光抑制的影响。我们发现，从59μm−2S−1跃迁到1455μ摩尔光子m−2S−1后的前20个S内，PSI高度超还原，而在FL从132或272-1455μ摩尔光子m−2S−1跃迁的过程中，没有观察到这种严重的过度还原。在弱光阶段，较高的光强诱导类囊体膜上较高的质子梯度(ΔpH)，有利于光增强后ΔpH的快速形成，防止PSI的过度降低。这些结果表明，弱光位相显著影响FL中PSI光抑制的程度。从59或132-1455μ的−2S−1跃迁后，CEF活性先升高后下降至稳态。然而，在从272-1455μ−光子m−2S PSI 1的跃迁过程中，没有观察到这种瞬时的CEF刺激。此外，高光相的CEF激活高度依赖于PSI还原状态。我们的结论是，在FL中，CEF的激活受到精细的调控，以优化光保护和光利用效率之间的权衡。
Fluctuating light (FL) can induce the preferential photoinhibition of photosystem I (PSI) in angiosperms. However, the underlying mechanisms have not been fully clarified. In this study, we examined the effects of low-light phases on FL-induced photoinhibition of PSI inBletilla striata. We found that PSI was highly over-reduced within the first 20 s after transition from 59 to 1455 μmol photons m−2s−1. However, such severe over-reduction of PSI was not observed in FL transition from 132 or 272–1455 μmol photons m−2s−1. As a result, FL (59–1455) induced stronger PSI photoinhibition than FL (132–1455) and FL (272–1455). During low-light phase, a higher light intensity induced a higher proton gradient (ΔpH) across the thylakoid membranes, favoring the rapid formation of ΔpH after light increased and preventing an over-reduction of PSI. These results indicate that the low-light phase significantly affects the extent of PSI photoinhibition in FL. After transition from 59 or 132–1455 μmol photons m−2s−1, CEF activity first increased and then decreased to the steady-state. However, such transient CEF stimulation was not observed during the transition from 272–1455 μmol photons m−2s−1. Furthermore, the CEF activation in the high-light phase was highly dependent on the PSI reduction state. We conclude that CEF activation is finely regulated to optimize the trade-off between photoprotection and light use efficiency in FL.
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影响因子：
7.4
作者：
S. Takahashi;Sara E. Milward;Da-Yong Fan;W. Chow;M. Badger
通讯作者：
S. Takahashi;Sara E. Milward;Da-Yong Fan;W. Chow;M. Badger
影响因子：
3.7
作者：
Stefan Niedermaier;Trang Schneider;Marc-Oliver Bahl;S. Matsubara;Pitter F. Huesgen
通讯作者：
Stefan Niedermaier;Trang Schneider;Marc-Oliver Bahl;S. Matsubara;Pitter F. Huesgen
影响因子：
4.6
作者：
Yamori W;Makino A;Shikanai T
通讯作者：
Shikanai T
影响因子：
3.7
作者：
Zivcak, Marek;Brestic, Marian;Kalaji, Hazem M.;Govindjee
通讯作者：
Govindjee
DOI：
10.1073/pnas.0503952102
发表时间：
2005-07-05
影响因子：
11.1
作者：
Avenson, TJ;Cruz, JA;Kramer, DM
通讯作者：
Kramer, DM