Department of Molecular Plant Physiology, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096, Warsaw, Poland.
Photosynth Res. 2021 Jan;147(1):61-73. doi: 10.1007/s11120-020-00796-x. Epub 2020 Nov 24.
Photosynthesis and respiration rates, pigment contents, CO compensation point, and carbonic anhydrase activity in Cyanidioschizon merolae cultivated in blue, red, and white light were measured. At the same light quality as during the growth, the photosynthesis of cells in blue light was significantly lowered, while under red light only slightly decreased as compared with white control. In white light, the quality of light during growth had no effect on the rate of photosynthesis at low O and high CO concentration, whereas their atmospheric level caused only slight decrease. Blue light reduced markedly photosynthesis rate of cells grown in white and red light, whereas the effect of red light was not so great. Only cells grown in the blue light showed increased respiration rate following the period of both the darkness and illumination. Cells grown in red light had the greatest amount of chlorophyll a, zeaxanthin, and β-carotene, while those in blue light had more phycocyanin. The dependence on O concentration of the CO compensation point and the rate of photosynthesis indicate that this alga possessed photorespiration. Differences in the rate of photosynthesis at different light qualities are discussed in relation to the content of pigments and transferred light energy together with the possible influence of related processes. Our data showed that blue and red light regulate photosynthesis in C. merolae for adjusting its metabolism to unfavorable for photosynthesis light conditions.
测定了在蓝光、红光和白光下培养的 Cyanidioschizon merolae 的光合作用和呼吸速率、色素含量、CO 补偿点和碳酸酐酶活性。在与生长时相同的光质下，蓝光下细胞的光合作用明显降低，而红光下与白光对照相比仅略有下降。在白光下，生长时光质的质量对低 O 和高 CO 浓度下的光合作用速率没有影响，而大气水平仅导致轻微下降。蓝光显著降低了在白光和红光中生长的细胞的光合作用速率，而红光的影响则不那么大。只有在蓝光下生长的细胞在黑暗和光照期后表现出呼吸速率的增加。在红光下生长的细胞具有最大量的叶绿素 a、玉米黄质和 β-胡萝卜素，而在蓝光下生长的细胞具有更多的藻蓝蛋白。CO 补偿点和光合作用速率对 O 浓度的依赖性表明，这种藻类具有光呼吸。不同光质下光合作用速率的差异与色素含量和转移的光能有关，并与相关过程的可能影响有关。我们的数据表明，蓝光和红光调节 C. merolae 的光合作用，以调整其新陈代谢以适应不利于光合作用的光条件。
