Combined effects of CO2 and light on the N2-fixing cyanobacterium Trichodesmium IMS101: a mechanistic view.

Plant Physiology
Orly LevitanIlana Berman-Frank

Abstract

The marine diazotrophic cyanobacterium Trichodesmium responds to elevated atmospheric CO(2) partial pressure (pCO(2)) with higher N(2) fixation and growth rates. To unveil the underlying mechanisms, we examined the combined influence of pCO(2) (150 and 900 microatm) and light (50 and 200 micromol photons m(-2) s(-1)) on Trichodesmium IMS101. We expand on a complementary study that demonstrated that while elevated pCO(2) enhanced N(2) fixation and growth, oxygen evolution and carbon fixation increased mainly as a response to high light. Here, we investigated changes in the photosynthetic fluorescence parameters of photosystem II, in ratios of the photosynthetic units (photosystem I:photosystem II), and in the pool sizes of key proteins involved in the fixation of carbon and nitrogen as well as their subsequent assimilation. We show that the combined elevation in pCO(2) and light controlled the operation of the CO(2)-concentrating mechanism and enhanced protein activity without increasing their pool size. Moreover, elevated pCO(2) and high light decreased the amounts of several key proteins (NifH, PsbA, and PsaC), while amounts of AtpB and RbcL did not significantly change. Reduced investment in protein biosynthesis, without nota...Continue Reading

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Citations

Dec 31, 2010·Photosynthesis Research·Sven A KranzBjörn Rost
Feb 18, 2011·Photosynthesis Research·John A RavenStephen C Maberly
Oct 17, 2012·Proceedings of the National Academy of Sciences of the United States of America·Dalin ShiFrançois M M Morel
Feb 2, 2011·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Toby Tyrrell
Mar 22, 2013·PloS One·Evelyn LawrenzDavid J Suggett
Jan 25, 2013·The New Phytologist·Jenna L LoshFrançois M M Morel
Nov 29, 2017·Applied and Environmental Microbiology·Nathan G WalworthDavid A Hutchins
Jul 11, 2014·Environmental Microbiology·Dina SpunginOrly Levitan
May 5, 2020·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Hansol KimJang-Seu Ki
Feb 21, 2019·Proceedings of the National Academy of Sciences of the United States of America·Yinon M Bar-On, Ron Milo
Jul 1, 2017·Scientific Reports·Eyal Rahav, Edo Bar-Zeev
Jul 7, 2021·Environmental Microbiology·Mary R GradovilleJonathan P Zehr

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