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首页> 外文期刊>Polar biology >Temperature effects on photosynthetic performance of Antarctic lichen Dermatocarpon polyphyllizum: a chlorophyll fluorescence study
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Temperature effects on photosynthetic performance of Antarctic lichen Dermatocarpon polyphyllizum: a chlorophyll fluorescence study

机译：温度对南极地衣多皮植物光合性能的影响：叶绿素荧光研究

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摘要

Chlorophyll fluorescence is an important indicator of a photosynthetic energy conversion in chloroplast photosystem II and responds sensitively to stress factors affecting photosynthesizing organisms. Three different methods were employed to identify the most sensitive fluorescence parameters responding to thallus temperature decrease within Antarctic lichen Dermatocarpon polyphyllizum: (1) Fast chlorophyll fluorescence transient (OJIP with parameters characterizing photosystem II functioning) (2) Slow Kautsky kinetics supplemented by saturation pulses (to evaluate quantum yield of photosynthetic processes in photosystem II, as well as maximum quantum PSII efficiency and non-photochemical and photochemical quenching), and (3) Linear cooling from +22 to-40 degrees C (to determine change in phi(PSII) and the critical temperature for PSII). A K-step (usually documented at highly stressed organisms) was found in OJIPs measured at+22 degrees C at 0.22-0.40ms and attributed to the negative effect of high temperature on PSII functioning, PSII donor side limitation in particular. At subzero temperature (-0.5, -5 degrees C), an L-step was detected at 0.05ms and related to a low temperature-induced decrease in connectivity between light-harvesting complexes and PSII. An increase of DI0/RC (the flux of dissipated excitation energy) was reported for the first time in lichens. The OJIP-derived parameters, DI0/RC and Phi_D-0 (quantum yield of energy dissipation) in particular, indicated that they might be used for the detection of early events in low temperature-affected lichens. Linear cooling data determined the critical temperature (-12 degrees C) for primary photosynthetic processes (phi(PSII)) in Dermatocarpon.
机译：叶绿素荧光是叶绿体光系统II中光合作用能量转换的重要指标，并且对影响光合作用生物的胁迫因子敏感地响应。三种不同的方法被用来确定响应南极地衣德耳ato变种内温度变化最敏感的荧光参数：（1）快速叶绿素荧光瞬变（OJIP具有表征光系统II功能的参数）（2）慢Kautsky动力学补充饱和脉冲（评估光系统II中光合作用过程的量子产率，以及最大的量子PSII效率以及非光化学和光化学猝灭；以及（3）从+22到40摄氏度的线性冷却（以确定phi（PSII）的变化）和PSII的临界温度）。在+22摄氏度，0.22-0.40毫秒下测量的OJIP中发现了一个K步（通常在高压力生物体中记录），这归因于高温对PSII功能（尤其是PSII供体侧限制）的负面影响。在零度以下的温度（-0.5，-5摄氏度）下，在0.05毫秒处检测到L阶跃，并且与低温诱导的光收集复合物和PSII之间的连通性降低有关。地衣中首次报道了DI0 / RC（耗散的激发能通量）的增加。 OJIP派生的参数DI0 / RC和Phi_D-0（能量耗散的量子产率）尤其表明，它们可用于检测受低温影响的地衣中的早期事件。线性冷却数据确定了皮肤果皮中主要光合作用过程（phi（PSII））的临界温度（-12摄氏度）。

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