Relationship between isoprene emission and photosynthesis in diatoms, and its implications for global marine isoprene estimates

Global consensus estimates of marine isoprene emission (~ 1 TgC yr− 1) is significantly smaller than terrestrial isoprene emission (~ 500 TgC yr− 1), and the reasons are unclear. With the premise that isoprene emission is metabolically linked to photosynthesis in phytoplankton as in plants, we measu...

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Authors: Srikanta Dani, K. G., Silva Benavides, Ana Margarita, Michelozzi, Marco, Peluso, Gianfranco, Torzillo, Giuseppe, Loreto, Francesco
Format: article
Publication Date:2017
Country:Costa Rica
Institution:Universidad de Costa Rica
Repository:Kérwá
OAI Identifier:oai:kerwa.ucr.ac.cr:10669/73457
Online Access:http://www.sciencedirect.com/science/article/pii/S0304420316302742?via%3Dihub
https://hdl.handle.net/10669/73457
Access Level:Embargoed access
Keyword:Chlorophylls
Diatoms
Light response
Isoprene emission
Non-photochemical quenching
Photosynthesis
Phytoplankton
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network_name_str Costa Rica
spelling Relationship between isoprene emission and photosynthesis in diatoms, and its implications for global marine isoprene estimates Srikanta Dani, K. G. Silva Benavides, Ana Margarita Michelozzi, Marco Peluso, Gianfranco Torzillo, Giuseppe Loreto, Francesco Chlorophylls Diatoms Light response Isoprene emission Non-photochemical quenching Photosynthesis Phytoplankton Global consensus estimates of marine isoprene emission (~ 1 TgC yr− 1) is significantly smaller than terrestrial isoprene emission (~ 500 TgC yr− 1), and the reasons are unclear. With the premise that isoprene emission is metabolically linked to photosynthesis in phytoplankton as in plants, we measured isoprene emission and photosynthesis to changing light levels in high-density cultures of two diatom species, Phaeodactylum tricornutum and Chaetoceros calcitrans. Isoprene emission increased and did not saturate with increasing light levels in C. calcitrans under laboratory conditions, whereas isoprene emission of P. tricornutum decreased at high-light levels with an associated increase in non-photochemical quenching. When tested for CO2 response, emission from P. tricornutum increased under low CO2 (similar to higher plants) but did not cease in absence of dissolved CO2, plausibly due to CO2 concentrating mechanisms. Isoprene emission under full-sun light in outdoor cultures of C. calcitrans (500 ± 200 fmol μg Chl− 1 h− 1) was significantly greater than maximum emission in laboratory cultures (100 ± 30 fmol μg Chl− 1 h− 1). We show that photosynthetic capacity of diatoms can be equal to or greater than that of higher plants. However, the carbon cost of isoprene emission in diatoms (≤ 0.0005% of photosynthesis) is significantly smaller than that in plants (0.9%). Based on these findings, we calculate that isoprene emission from diatoms alone can contribute ~ 4.8 TgC yr− 1 to the atmosphere, which is much greater than current modelled projections for annual isoprene emission from the entire marine ecosystem. Consiglio Nazionale delle Ricerche/[0006328]//Italia Consiglio Nazionale delle Ricerche/[IBBR-006-2014-NA]//Italia Understanding the Seventh Framework Programme/[ECLAIRE 282910]/FP7/Reino Unido Understanding the Seventh Framework Programme/[KBBE 289582]/FP7/Europa UCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias Básicas::Centro de Investigación en Ciencias del Mar y Limnología (CIMAR) http://www.sciencedirect.com/science/article/pii/S0304420316302742?via%3Dihub 0304-4203 https://hdl.handle.net/10669/73457 10.1016/j.marchem.2016.12.005
title Relationship between isoprene emission and photosynthesis in diatoms, and its implications for global marine isoprene estimates
spellingShingle Relationship between isoprene emission and photosynthesis in diatoms, and its implications for global marine isoprene estimates
Srikanta Dani, K. G.
Chlorophylls
Diatoms
Light response
Isoprene emission
Non-photochemical quenching
Photosynthesis
Phytoplankton
title_short Relationship between isoprene emission and photosynthesis in diatoms, and its implications for global marine isoprene estimates
title_full Relationship between isoprene emission and photosynthesis in diatoms, and its implications for global marine isoprene estimates
title_fullStr Relationship between isoprene emission and photosynthesis in diatoms, and its implications for global marine isoprene estimates
title_full_unstemmed Relationship between isoprene emission and photosynthesis in diatoms, and its implications for global marine isoprene estimates
title_sort Relationship between isoprene emission and photosynthesis in diatoms, and its implications for global marine isoprene estimates
author Srikanta Dani, K. G.
author_facet Srikanta Dani, K. G.
Silva Benavides, Ana Margarita
Michelozzi, Marco
Peluso, Gianfranco
Torzillo, Giuseppe
Loreto, Francesco
author_role author
author2 Silva Benavides, Ana Margarita
Michelozzi, Marco
Peluso, Gianfranco
Torzillo, Giuseppe
Loreto, Francesco
author2_role author
author
author
author
author
topic Chlorophylls
Diatoms
Light response
Isoprene emission
Non-photochemical quenching
Photosynthesis
Phytoplankton
topic_facet Chlorophylls
Diatoms
Light response
Isoprene emission
Non-photochemical quenching
Photosynthesis
Phytoplankton
description Global consensus estimates of marine isoprene emission (~ 1 TgC yr− 1) is significantly smaller than terrestrial isoprene emission (~ 500 TgC yr− 1), and the reasons are unclear. With the premise that isoprene emission is metabolically linked to photosynthesis in phytoplankton as in plants, we measured isoprene emission and photosynthesis to changing light levels in high-density cultures of two diatom species, Phaeodactylum tricornutum and Chaetoceros calcitrans. Isoprene emission increased and did not saturate with increasing light levels in C. calcitrans under laboratory conditions, whereas isoprene emission of P. tricornutum decreased at high-light levels with an associated increase in non-photochemical quenching. When tested for CO2 response, emission from P. tricornutum increased under low CO2 (similar to higher plants) but did not cease in absence of dissolved CO2, plausibly due to CO2 concentrating mechanisms. Isoprene emission under full-sun light in outdoor cultures of C. calcitrans (500 ± 200 fmol μg Chl− 1 h− 1) was significantly greater than maximum emission in laboratory cultures (100 ± 30 fmol μg Chl− 1 h− 1). We show that photosynthetic capacity of diatoms can be equal to or greater than that of higher plants. However, the carbon cost of isoprene emission in diatoms (≤ 0.0005% of photosynthesis) is significantly smaller than that in plants (0.9%). Based on these findings, we calculate that isoprene emission from diatoms alone can contribute ~ 4.8 TgC yr− 1 to the atmosphere, which is much greater than current modelled projections for annual isoprene emission from the entire marine ecosystem.
publishDate 2017
format article
url http://www.sciencedirect.com/science/article/pii/S0304420316302742?via%3Dihub
https://hdl.handle.net/10669/73457
identifier_str_mv 10.1016/j.marchem.2016.12.005
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collection Kérwá
reponame_str Kérwá
instname_str Universidad de Costa Rica
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publishDateSort 2017
author_browse Loreto, Francesco
Michelozzi, Marco
Peluso, Gianfranco
Silva Benavides, Ana Margarita
Srikanta Dani, K. G.
Torzillo, Giuseppe
score 6,924472

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