On the rate of phytoplankton respiration in the light.
On the rate of phytoplankton respiration in the light.
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关于浮游植物在光照下的呼吸速率
DOI：
10.1093/plphys/kiac254
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发表时间：
2022-08-29
期刊：
影响因子：
7.4
通讯作者：
Griffin, Kevin
中科院分区：
文献类型：
--
作者：
Bender, Michael L.;Zhu, Xin-Guang;Falkowski, Paul;Ma, Fangfang;Griffin, Kevin
藻类和蓝藻在光照下的呼吸速率是一个重要的生理生态学术语，仍有待完全表征和量化。为了解决这个问题，我们利用特定工艺的脱羧速率通量平衡分析和同位素非稳态代谢通量分析。我们的研究，根据已发表的数据，表明脱羧是净CO2同化的22%，当三羧酸循环是完全开放的（其特征是α酮戊二酸的氨基酸合成和非常低的琥珀酸形成率的承诺）。通过计算合成生物质（蛋白质，脂质和碳水化合物）的主要成分所需的脱羧速率来支持这一估计。在脱羧产生的22个CO2分子中（归一化为净同化= 100），约13个来自丙酮酸，3个来自异柠檬酸。其余6个脱羧单元位于三羧酸循环外的氨基酸合成途径中。一个小的额外通量来自光呼吸，在氧化戊糖磷酸途径中六个磷酸葡萄糖酸盐的脱羧，以及在合成低丰度化合物（包括色素和核糖核酸）时的脱羧。与陆生植物相比，藻类和蓝藻的脱羧率高，这一一般方法占。它提示了一个简单的猜测的起源角效应，并有助于限制光合自养呼吸率，在光，在真光区的海洋和湖泊。在光，净非光呼吸脱羧通常与生物合成和总和约25%的净碳同化根据两个独立的方法。
The rate of algal and cyanobacterial respiration in the light is an important ecophysiological term that remains to be completely characterized and quantified. To address this issue, we exploited process-specific decarboxylation rates from flux balance analysis and isotopically nonstationary metabolic flux analysis. Our study, based on published data, suggested that decarboxylation is about 22% of net CO2 assimilation when the tricarboxylic acid cycle is completely open (characterized by the commitment of alpha ketoglutarate to amino acid synthesis and very low rates of succinate formation). This estimate was supported by calculating the decarboxylation rates required to synthesize the major components of biomass (proteins, lipids, and carbohydrates) at their typical abundance. Of the 22 CO2 molecules produced by decarboxylation (normalized to net assimilation = 100), approximately 13 were from pyruvate and 3 were from isocitrate. The remaining six units of decarboxylation were in the amino acid synthesis pathways outside the tricarboxylic acid cycle. A small additional flux came from photorespiration, decarboxylations of six phosphogluconate in the oxidative pentose phosphate pathway, and decarboxylations in the syntheses of lower-abundance compounds, including pigments and ribonucleic acids. This general approach accounted for the high decarboxylation rates in algae and cyanobacteria compared to terrestrial plants. It prompts a simple speculation for the origin of the Kok effect and helps constrain the photoautotrophic respiration rate, in the light, in the euphotic zone of the ocean and lakes. In the light, net nonphotorespiratory decarboxylations are generally associated with biosynthesis and sum to about 25% of net carbon assimilation according to two independent approaches.
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影响因子：
8.4
作者：
Jazmin LJ;Xu Y;Cheah YE;Adebiyi AO;Johnson CH;Young JD
通讯作者：
Young JD
DOI：
10.3390/molecules23102583
发表时间：
2018-10-09
期刊：
Molecules (Basel, Switzerland)
影响因子：
--
作者：
de Carvalho CCCR;Caramujo MJ
通讯作者：
Caramujo MJ
影响因子：
3.8
作者：
Hendry, John I.;Prasannan, Charulata;Wangikar, Pramod P.
通讯作者：
Wangikar, Pramod P.
影响因子：
9.4
作者：
Crous, Kristine Y.;O'Sullivan, Odhran S.;Atkin, Owen K.
通讯作者：
Atkin, Owen K.
影响因子：
7.3
作者：
Buckley, Thomas N.;Adams, Mark A.
通讯作者：
Adams, Mark A.