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首页> 外文期刊>Polar biology >Photosynthetic response and recovery of Antarctic marine benthic microalgae exposed to elevated irradiances and temperatures
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Photosynthetic response and recovery of Antarctic marine benthic microalgae exposed to elevated irradiances and temperatures

机译：暴露于高辐照度和高温下的南极海底底微藻的光合作用和恢复

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摘要

Exposure to high temperatures affects the photosynthetic processes in marine benthic microalgae by limiting the transport of electrons, thus reducing the ability of the cell to use light. This causes damage to the Photo-system Ⅱ (PSII) and may lead to photoinhibition. However, the PSII of benthic microalgal communities from Brown Bay, eastern Antarctica, were relatively unaffected by significant changes in temperature. Benthic microalgae exposed to temperatures up to 8°C and an irradiance of 450 μmol photons m~(-2) s~(-1) did not experience any photosynthetic damage or irreversible photoinhibition. The effective quantum yield (△F/F_m) at 8℃ (0.433 ± 0.042) was higher by comparison to cell incubated at-0.1℃ (0.373 ± 0.015) with similar irradiances. Temperatures down to-5℃ at a similar irradiance showed a decrease in photosynthesis with decreasing temperature, but no severe photoinhibition as the cells were able to dissipate excess energy via non-photochemical quenching and recover from damage. These responses are consistent with those recorded in past studies on Antarctic benthic microalgae and suggest that short-term temperature change (from-5 to 8℃) will not do irreversible damage to the PSII and will not affect the photosynthesis of the benthic microalgae.
机译：暴露于高温下会限制电子的传输，从而影响海洋底栖微藻的光合作用过程，从而降低细胞利用光的能力。这会损坏Photo-systemⅡ（PSII），并可能导致光抑制。然而，南极东部布朗湾底栖微藻群落的PSII相对不受温度变化的影响。底栖微藻暴露于高达8°C的温度和450μmol光子m〜（-2）s〜（-1）的辐照下，未发生任何光合损伤或不可逆的光抑制作用。与在类似辐照度下于-0.1℃（0.373±0.015）孵育的细胞相比，在8℃（0.433±0.042）处的有效量子产率（△F / F_m）更高。在相似的辐照度下，低至-5℃的温度显示出光合作用随温度降低而降低，但没有严重的光抑制作用，因为细胞能够通过非光化学淬灭耗散多余的能量并从损伤中恢复。这些反应与过去对南极底栖微藻的研究记录的反应一致，表明短期温度变化（从5到8℃）不会对PSII造成不可逆转的损害，也不会影响底栖微藻的光合作用。

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  • 来源
    《Polar biology》 |2011年第6期|p.855-869|共15页
  • 作者

    Sazlina Salleh; Andrew McMinn;

  • 作者单位

    Institute for Marine and Antarctic Studies (IMAS),University of Tasmania, Hobart, TAS 7001, Australia,Center for Marine and Coastal Studies,Universiti Sains Malaysia, 11800 Minden, Penang, Malaysia;

    Institute for Marine and Antarctic Studies (IMAS),University of Tasmania, Hobart, TAS 7001, Australia;

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  • 正文语种 eng
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  • 关键词

    antarctic benthic microalgae; photoinhibition; recovery; temperature;

    机译：南极底栖微藻;光抑制复苏;温度;

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