Niki Kenta, Aikawa Shimpei, Yokono Makio, Kondo Akihiko, Akimoto Seiji
Graduate School of Science, Kobe University, Kobe, 657-8501, Japan.
Photosynth Res. 2015 Aug;125(1-2):201-10. doi: 10.1007/s11120-015-0079-z. Epub 2015 Jan 11.
Currently, cyanobacteria are regarded as potential biofuel sources. Large-scale cultivation of cyanobacteria in seawater is of particular interest because seawater is a low-cost medium. In the present study, we examined differences in light-harvesting and energy transfer processes in the cyanobacterium Synechococcus sp. PCC 7002 grown in different cultivation media, namely modified A medium (the optimal growth medium for Synechococcus sp. PCC 7002) and f/2 (a seawater medium). The concentrations of nitrate and phosphate ions were varied in both media. Higher nitrate ion and/or phosphate ion concentrations yielded high relative content of phycobilisome. The cultivation medium influenced the energy transfers within phycobilisome, from phycobilisome to photosystems, within photosystem II, and from photosystem II to photosystem I. We suggest that the medium also affects charge recombination at the photosystem II reaction center and formation of a chlorophyll-containing complex.
目前，蓝细菌被视为潜在的生物燃料来源。在海水中大规模培养蓝细菌特别受关注，因为海水是一种低成本的培养基。在本研究中，我们研究了集胞藻属蓝细菌PCC 7002在不同培养基（即改良A培养基，集胞藻属蓝细菌PCC 7002的最佳生长培养基，以及f/2培养基，一种海水培养基）中生长时，其光捕获和能量转移过程的差异。两种培养基中硝酸盐和磷酸盐离子的浓度均有所变化。较高的硝酸根离子和/或磷酸根离子浓度产生了较高的藻胆体相对含量。培养基影响了藻胆体内的能量转移、从藻胆体到光系统的能量转移、光系统II内的能量转移以及从光系统II到光系统I的能量转移。我们认为该培养基还会影响光系统II反应中心的电荷复合以及含叶绿素复合物的形成。
