Carbon Transfer from the Host Diatom Enables Fast Growth and High Rate of N-2 Fixation by Symbiotic Heterocystous Cyanobacteria

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388971%3A_____%2F20%3A00524463" target="_blank" >RIV/61388971:_____/20:00524463 - isvavai.cz</a>

Result on the web

<a href="https://www.mdpi.com/2223-7747/9/2/192" target="_blank" >https://www.mdpi.com/2223-7747/9/2/192</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/plants9020192" target="_blank" >10.3390/plants9020192</a>

Result language

angličtina

Original language name

Carbon Transfer from the Host Diatom Enables Fast Growth and High Rate of N-2 Fixation by Symbiotic Heterocystous Cyanobacteria

Original language description

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.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10606 - Microbiology

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Plants

ISSN

2223-7747

e-ISSN

—

Volume of the periodical

9

Issue of the periodical within the volume

2

Country of publishing house

CH - SWITZERLAND

Number of pages

16

Pages from-to

192

UT code for WoS article

000519248200096

EID of the result in the Scopus database

2-s2.0-85079192897