Stimulation of Cyclic Electron Flow During Recovery After Chilling-Induced Photoinhibition of PSII
Stimulation of Cyclic Electron Flow During Recovery After Chilling-Induced Photoinhibition of PSII
复制标题
PSII 冷却诱导光抑制后恢复过程中循环电子流的刺激
DOI：
10.1093/pcp/pcq144
复制
发表时间：
2010-11-01
影响因子：
4.9
通讯作者：
Cao, Kun-Fang
中科院分区：
文献类型：
--
作者：
Huang, Wei;Zhang, Shi-Bao;Cao, Kun-Fang
虽然循环电子流（CEF）是必不可少的PSII的修复，目前还不清楚是否刺激CEF和PSI的稳定性在恢复过程中的作用。为了探讨这两个问题，将降香黄檀成熟叶片在低温（4 ℃）、光合通量密度（PFD）为650 μ mol·m（-2）·s（-1）的条件下处理2 h，然后转移到25 ℃、PFD为100 μ mol·m（-2）·s（-1）的条件下进行恢复。在低温处理前后和随后的恢复过程中测定了PSII的最大量子产率（Fv/Fm）、最大光氧化性P700（P-m）、PSII中的能量分布和P700在25 ℃下在100 μ mol m（-2）s（-1）PFD下的氧化还原态。我们发现，CEF在光损伤后的恢复过程中被显著刺激。在恢复过程中，CEF的刺激与PSII的光损伤之间存在显著的正相关。我们的结果表明，CEF被显着刺激，以提高ATP的合成，为PSII的快速修复。PSI活性的稳定性有利于通过CEF刺激PS Ⅱ活性的快速修复。
Although cyclic electron flow (CEF) is essential for repair of PSII, it is unclear whether the CEF is stimulated and what the role of stability of PSI is during the recovery. In order to explore these two questions, mature leaves of Dalbergia odorifera were treated with the chilling temperature of 4 degrees C under a photosynthetic flux density (PFD) of 650 mu mol m(-2) s(-1) for 2 h and then were transferred to 25 degrees C under a PFD of 100 mu mol m(-2) s(-1) for recovery. The maximum quantum yield of PSII (Fv/Fm), the maximum photo-oxidizable P700 (P-m), the energy distribution in PSII and the redox state of P700 at 25 degrees C under a PFD of 100 mu mol m(-2) s(-1) were determined before and after chilling treatment and during subsequent recovery. We found that the CEF was significantly stimulated during the recovery after photodamage. There is a significant positive correlation between stimulation of CEF and photodamage of PSII during recovery. Our results indicated that CEF was significantly stimulated in order to enhance the synthesis of ATP for the fast repair of PSII. The stability of PSI activity favored the fast repair of PSII activity through stimulation of CEF.