کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
5143688 1496647 2017 29 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
Relationship between isoprene emission and photosynthesis in diatoms, and its implications for global marine isoprene estimates
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موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
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Relationship between isoprene emission and photosynthesis in diatoms, and its implications for global marine isoprene estimates
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Marine Chemistry - Volume 189, 20 February 2017, Pages 17-24
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