Acclimation of photosynthetic properties in ice algae

冰藻光合特性的驯化

• 批准号: 09640760
• 负责人: IMURA Satoshi
• 金额: $ 2.05万
• 依托单位: National Institute of Polar Research
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640760/
• 关键词: Ice algae; Diatom; Photosynthesis; Photosystem; RubisCO; Diadinoxan thin cycle; Acclimation; accessory pigments; Rubis CO; クロロフィルa; 光捕集色素系; 蛍光; アイスアルジ-; 光合成補助色素; 光環境応答

Ice algae and diatoms perform highly efficient photosynthesis, in spite of these very severe environments. We investigated how their light-harvesting systems or photosystems acclimate to very low irradiance to achieve efficient photosynthesis. The way of acclimation was very unique, which was opposite to that of higher plants or green algae. In ice algae, the accessory pigments and also RubisCO were decreased and the ratio of photosystem I (PSI) to PS II was lowered in lower irradiance. And photosynthetic systems acclimated highly to very low irradiance were protected by functional diadinoxanthin cycle, equivalent to the xanthophylls cycle of higher plant, against higher irradiance.The maximum photosysthetic rate was also retained at the same level and photo inhibition could not be observed under illumination up to -800 uEm-2s-1. These properties may indicate that the efficient light-energy utilization and functioning of photosystems of the diatom cells under large variation of irradiance at short time-scale relative to their generation time such as in the ice.

冰藻和硅藻进行高效的光合作用，尽管这些非常恶劣的环境。我们研究了它们的捕光系统或光系统如何适应极低的光照以实现高效的光合作用。其驯化方式非常独特，与高等植物或绿色藻类的驯化方式相反。在冰藻中，在低光照下，辅助色素和RubisCO减少，光系统I（PSI）与PS II的比值降低。而高度适应极低光照的光合系统则受到相当于高等植物叶黄素循环的功能性二甲藻黄素循环的保护，最大光合速率也保持在同一水平，在-800 uEm ~（-2）s ~（-1）的光照条件下不受光抑制。这些性质可能表明，有效的光能利用和功能的硅藻细胞的光系统下的大的变化，在短的时间尺度相对于他们的世代时间，如在冰的辐照度。

项目成果

Ikeya, T., et al.: "Acclimation of photosynthetic properties in psychrophilic diatom isolates under different light intensities"Polar Bioscience. 13. 43-54 (1999)

Ikeya, T. 等人：“不同光强度下嗜冷硅藻分离物光合特性的适应”Polar Bioscience。

Kashino, Y., Fujimoto, K., Akamatsu, A., Kaoike, H., Satoh K., and Kudoh S.: "Photosynthetic pigment composition of ice algal and phytoplankton assemblages in early spring in Saroma ko lagoon, Hokkaido, Japan."Proc. NIPR symp. Polar Biol. 11. 22-32 (1998)

Kashino, Y.、Fujimoto, K.、Akamatsu, A.、Kaoike, H.、Satoh K. 和 Kudoh S.：“日本北海道佐吕间泻湖早春冰藻和浮游植物组合的光合色素成分

Kashino Y, et al.: "Photosynthetic pigment composition of ice algal and phytoplankton assemblages in early spring in Saroma Ko Lagoon,Hokkaido,Japan." Proceedings of the NIPR Symposium on Polar Biology. 11. 22-32 (1998)

Kashino Y 等人：“日本北海道 Saroma Ko 泻湖早春冰藻和浮游植物组合的光合色素成分。”

Kashino, Y., Fujimoto, K, Akamatu, A., Koike, H., Satoh K and S.: "Photosynthetic pigment composition of ice algal and phytoplankton assemblages in early spring in Saroma ko lagoon, Hokkaido, Japan"Proc. NIPR Symp. Plar Biol. 11. 22-32 (1998)

Kashino，Y.，Fujimoto，K，Akamatu，A.，Koike，H.，Satoh K 和 S.：“日本北海道 Saroma ko 泻湖早春冰藻和浮游植物组合的光合色素成分”Proc。

Ikeya, T, S. Kudoh, S. Imura, K, Watanabe, M. fukuchi and Y. Kashino: "Acclimation of photosynthetic properties in psychrophilic diatom isolates under different light intensities"Polar Bioscience. 13. 43-54 (1999)

Ikeya, T, S. Kudoh, S. Imura, K, Watanabe, M. fukuchi 和 Y. Kashino：“不同光强度下嗜冷硅藻分离物的光合特性的驯化”Polar Bioscience。