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标题：Divergent physiological and molecular responses of light‐ and iron‐limited Southern Ocean phytoplankton
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作者：Sarah M. Andrew ; Robert F. Strzepek ; Spencer M.Whitney 等
期刊名称：Limnology and Oceanography Letters
电子版ISSN：2378-2242
出版年度：2022
卷号：7
期号：2
页码：150-158
DOI：10.1002/lol2.10223
语种：English
出版社：Wiley
摘要：Abstract It has recently been shown that Southern Ocean phytoplankton species have evolved to optimize their light‐harvesting potential without increasing the high iron‐requiring proteins used for photosynthesis. We measured molecular and physiological responses of phytoplankton cultures under a combination of iron and light conditions. While iron‐replete cultures mostly increased biovolume, photochemical efficiency (Fv/Fm) and the relative abundance of photosystem II (PSII) and Cytochrome b6f protein compared to iron‐limited cultures, light also regulated cellular chlorophyll a content and played a role in controlling PSII protein abundance. Investment of protein resources into the carbon fixing enzyme Ribulose 1,5‐bisphosphate carboxylase oxygenase (Rubisco) was species‐specific, but increased growth rates correlated with increased investment into Rubisco for all species. Our results suggest that Proboscia inermis uses a divergent molecular strategy to compete for nutrients, light, and CO2 in the Southern Ocean.