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Carbon Transfer from the Host Diatom Enables Fast Growth and High Rate of N-2 Fixation by Symbiotic Heterocystous Cyanobacteria
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SYSNO ASEP 0524463 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Carbon Transfer from the Host Diatom Enables Fast Growth and High Rate of N-2 Fixation by Symbiotic Heterocystous Cyanobacteria Tvůrce(i) Inomura, K. (US)
Follett, C.L. (US)
Masuda, Takako (MBU-M) ORCID
Eichner, Meri (MBU-M) ORCID, RID
Prášil, Ondřej (MBU-M) RID, ORCID
Deutsch, C. (US)Číslo článku 192 Zdroj.dok. Plants. - : MDPI
Roč. 9, č. 2 (2020)Poč.str. 16 s. Jazyk dok. eng - angličtina Země vyd. CH - Švýcarsko Klíč. slova DDA ; nitrogen fixation ; diatom Vědní obor RIV EE - Mikrobiologie, virologie Obor OECD Microbiology CEP GA16-15467S GA ČR - Grantová agentura ČR LO1416 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Způsob publikování Open access Institucionální podpora MBU-M - RVO:61388971 UT WOS 000519248200096 EID SCOPUS 85079192897 DOI 10.3390/plants9020192 Anotace Diatom-diazotroph associations (DDAs) are symbioses where trichome-forming cyanobacteria support the host diatom with fixed nitrogen through dinitrogen (N-2) fixation. It is inferred that the growth of the trichomes is also supported by the host, but the support mechanism has not been fully quantified. Here, we develop a coarse-grained, cellular model of the symbiosis between Hemiaulus and Richelia (one of the major DDAs), which shows that carbon (C) transfer from the diatom enables a faster growth and N-2 fixation rate by the trichomes. The model predicts that the rate of N-2 fixation is 5.5 times that of the hypothetical case without nitrogen (N) transfer to the host diatom. The model estimates that 25% of fixed C from the host diatom is transferred to the symbiotic trichomes to support the high rate of N-2 fixation. In turn, 82% of N fixed by the trichomes ends up in the host. Modeled C fixation from the vegetative cells in the trichomes supports only one-third of their total C needs. Even if we ignore the C cost for N-2 fixation and for N transfer to the host, the total C cost of the trichomes is higher than the C supply by their own photosynthesis. Having more trichomes in a single host diatom decreases the demand for N-2 fixation per trichome and thus decreases their cost of C. However, even with five trichomes, which is about the highest observed for Hemiaulus and Richelia symbiosis, the model still predicts a significant C transfer from the diatom host. These results help quantitatively explain the observed high rates of growth and N-2 fixation in symbiotic trichomes relative to other aquatic diazotrophs. Pracoviště Mikrobiologický ústav Kontakt Eliška Spurná, eliska.spurna@biomed.cas.cz, Tel.: 241 062 231 Rok sběru 2021 Elektronická adresa https://www.mdpi.com/2223-7747/9/2/192
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