Possible Roles of Near-infrared Light on the Photosynthesis in Synechocystis sp. PCC6803 under Solar Simulating Artificial Light

Q3 Agricultural and Biological Sciences Environmental Control in Biology Pub Date : 2018-01-01 DOI:10.2525/ECB.56.17
Kota Oshita, Takuya Suzuki, T. Kawano
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引用次数: 3

Abstract

Solar simulating light (SSL) has been widely used for evaluating the performance of photovoltaic cells and algal photosynthesis. Green plants and algae utilize chlorophylls, thus, the chlorophyll-targeting light components mostly contribute to photosynthesis. In contrast, near infrared (NIR) light hardly energizes photosynthesis. Since SSL spectrum covers a wide range of light from ultraviolet to NIR, we examined the roles of NIR components in SSL during photosynthetic O 2 evolution in Synechocystis (sp. PCC6803), by selectively and step-wisely eliminating the NIR using several NIR-cut filters. Here, the effects of intact SSL spectrum and the NIR-cut filtered SSL spectra (lacking NIR light greater than 690, 710, 750, or 810 nm) were examined. We observed that the 750 nm shortpass filter lowered the maximal photosynthetic velocity ( P max ), and concomitantly, the Michaelis constant-like value for light intensity ( K j ), whereas no significant change was observed with the 810 nm shortpass filter. We concluded that the 750 (cid:1) 810 nm band may contain the photosynthesis-stimulating NIR component acting differently from the known phenomenon (Emerson effect). In contrast, Synechocystis unexpectedly regained the photosynthetic performance by eliminating all range of NIR ( (cid:6) 710 nm), suggesting that 710 (cid:1) 750 nm far-red band corresponding to the absorption band for bacterial phytochrome is possibly inhibitory to photosynthesis.
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太阳模拟人工光下近红外光对聚囊藻PCC6803光合作用的可能作用
太阳模拟光(Solar simulation light, SSL)已被广泛用于评价光伏电池和藻类光合作用的性能。绿色植物和藻类利用叶绿素,因此以叶绿素为目标的光组分主要参与光合作用。相比之下,近红外(NIR)光几乎不能激发光合作用。由于SSL光谱涵盖了从紫外线到近红外的广泛范围,我们研究了近红外成分在synnechocystis (sp. PCC6803)光合o2进化过程中SSL的作用,通过使用几个NIR-cut滤波器选择性地逐步消除近红外。本文研究了完整的SSL光谱和NIR切割过滤的SSL光谱(缺乏超过690、710、750和810 nm的近红外光)的影响。我们观察到750 nm的近通滤镜降低了最大光合速率(P max),同时降低了光强的Michaelis常数值(K j),而810 nm的近通滤镜没有显著变化。我们得出结论,750 (cid:1) 810 nm波段可能含有刺激光合作用的近红外成分,其作用与已知现象(爱默生效应)不同。相比之下,Synechocystis出人意料地通过消除近红外((cid:6) 710 nm)的所有范围来恢复光合作用,这表明与细菌光敏色素吸收带对应的710 (cid:1) 750 nm远红波段可能对光合作用有抑制作用。
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来源期刊
Environmental Control in Biology
Environmental Control in Biology Agricultural and Biological Sciences-Agronomy and Crop Science
CiteScore
2.00
自引率
0.00%
发文量
25
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