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标题：A penalty on photosynthetic growth in fluctuating light
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作者：Percival J. Graham ; Brian Nguyen ; Thomas Burdyny 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2017
卷号：7
期号：1
DOI：10.1038/s41598-017-12923-1
语种：English
出版社：Springer Nature
摘要：Fluctuating light is the norm for photosynthetic organisms, with a wide range of frequencies (0.00001 to 10 Hz) owing to diurnal cycles, cloud cover, canopy shifting and mixing; with broad implications for climate change, agriculture and bioproduct production. Photosynthetic growth in fluctuating light is generally considered to improve with increasing fluctuation frequency. Here we demonstrate that the regulation of photosynthesis imposes a penalty on growth in fluctuating light for frequencies in the range of 0.01 to 0.1 Hz (organisms studied: Synechococcus elongatus and Chlamydomonas reinhardtii). We provide a comprehensive sweep of frequencies and duty cycles. In addition, we develop a 2(nd) order model that identifies the source of the penalty to be the regulation of the Calvin cycle - present at all frequencies but compensated at high frequencies by slow kinetics of RuBisCO.