Cyclic electron flow around photosystem I is required for adaptation to high temperature in a subtropical forest tree, Ficus concinna

Cyclic electron flow around photosystem I is required for adaptation to high temperature in a subtropical forest tree, Ficus concinna
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亚热带森林树 Ficus concinna 需要光系统 I 周围的循环电子流来适应高温

DOI:
10.1631/jzus.b0820348
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发表时间:
2009-10
影响因子:
5.1
通讯作者:
Wang, Jun-gang
Wang, Jun-gang
中科院分区:
生物学2区
文献类型:
--
作者:
Jin, Song-heng;Li, Xue-qin;Hu, Jun-yan;Wang, Jun-gang

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研究了亚热带森林树苗 Ficus concinna 高温胁迫下多余光子能量的耗散机制。经过20 d的高温胁迫后,CO2净同化率下降至对照的16%,因此吸收的光子能量超过了CO2同化所需的能量。高温应力后,开放光系统II(PSII)反应中心在中等辐照度下的激发能量捕获效率(Fν'/Fm')、光化学猝灭(qP)和PSII电子传输的量子产率(ΦPSII)均显着降低。然而,在这种条件下,非光化学猝灭(qNP)和能量依赖性猝灭(qE)明显更高。关闭光化光 (AL) 后,叶绿素 (Chl) 荧光的照射后瞬态显着增加,并且这种增加在 39 °C 生长的幼苗中明显高于 30 °C 生长的幼苗。辐照后荧光的增加表明在高生长温度条件下 PSI 周围的循环电子传输增强,从而有助于非辐射地耗散多余的光子能量。
Dissipation mechanisms of excess photon energy under high-temperature stress were studied in a subtropical forest tree seedling, Ficus concinna. Net CO2 assimilation rate decreased to 16% of the control after 20 d high-temperature stress, and thus the absorption of photon energy exceeded the energy required for CO2 assimilation. The efficiency of excitation energy capture by open photosystem II (PSII) reaction centres (Fν′/Fm′) at moderate irradiance, photochemical quenching (qP), and the quantum yield of PSII electron transport (ΦPSII) were significantly lower after high-temperature stress. Nevertheless, non-photochemical quenching (qNP) and energy-dependent quenching (qE) were significantly higher under such conditions. The post-irradiation transient of chlorophyll (Chl) fluorescence significantly increased after the turnoff of the actinic light (AL), and this increase was considerably higher in the 39 °C-grown seedlings than in the 30 °C-grown ones. The increased post-irradiation fluorescence points to enhanced cyclic electron transport around PSI under high growth temperature conditions, thus helping to dissipate excess photon energy non-radiatively.
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