Different phycobilin antenna organisations affect the balance between light use and growth rate in the cyanobacterium Microcystis aeruginosa and in the cryptophyte Cryptomonas ovata
Different phycobilin antenna organisations affect the balance between light use and growth rate in the cyanobacterium Microcystis aeruginosa and in the cryptophyte Cryptomonas ovata
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DOI：
10.1007/s11120-011-9715-4
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发表时间：
2012-03-01
影响因子：
3.7
通讯作者：
Wilhelm, Christian
中科院分区：
文献类型：
--
作者：
Kunath, Christfried;Jakob, Torsten;Wilhelm, Christian
近年来，通过调节叶绿素a的活体荧光来测量光合电子传递的方法已经发展到商业化水平。现在广泛接受的是，电子传递速率和新生物量之间的比率（P-Fl/B-C）不是固定的，并且取决于许多在分类学上可变的因素。在这项研究中，光子吸收和生物量生产之间的平衡已被测量在两个藻胆素含光养生物，即，蓝藻和隐藻，这在他们的天线组织不同。这表明，不同的天线组织施加的初级光合反应的调节和过度吸收的辐射耗散的影响。尽管两种光养生物的生物质生产的生长速率和量子效率相当，但与蓝细菌相比，隐藻中的P-Fl/B-C比率是蓝细菌的两倍。据推测，这种差异是因为细胞生长的代谢调节的差异。在隐藻中，吸收的光合能量用于将同化的碳直接转化为蛋白质和脂质，而在蓝细菌中，光合能量优先储存为碳水化合物。
During the recent years, wide varieties of methodologies have been developed up to the level of commercial use to measure photosynthetic electron transport by modulated chlorophyll a-in vivo fluorescence. It is now widely accepted that the ratio between electron transport rates and new biomass (P-Fl/B-C) is not fixed and depends on many factors that are also taxonomically variable. In this study, the balance between photon absorption and biomass production has been measured in two phycobilin-containing phototrophs, namely, a cyanobacterium and a cryptophyte, which differ in their antenna organization. It is demonstrated that the different antenna organization exerts influence on the regulation of the primary photosynthetic reaction and the dissipation of excessively absorbed radiation. Although, growth rates and the quantum efficiency of biomass production of both phototrophs were comparable, the ratio P-Fl/B-C was twice as high in the cryptophyte in comparison to the cyanobacterium. It is assumed that this discrepancy is because of differences in the metabolic regulation of cell growth. In the cryptophyte, absorbed photosynthetic energy is used to convert assimilated carbon directly into proteins and lipids, whereas in the cyanobacterium, the photosynthetic energy is preferentially stored as carbohydrates.