Neglected thermal effects of color-temperature on algal growth in aquatic environment under light

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2025-07-22 DOI:10.1016/j.watres.2025.124279

Guijiao Lin, Kaikai Deng, Peng Yan, Hao Yang, Bin Chen, Qiang He, Dongling Long, Jinsong Guo

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Abstract

Light and temperature critically regulate algal blooms; however, laboratory studies often fix temperature, neglecting light's thermal effects (endogenous photothermal effects, ETP) or equating them to external heating (exogenous thermal input, ETI). Color-temperature determines photon distribution, influencing thermal intensity in aquatic systems. In this study, Microcystis aeruginosa was exposed to five color-temperatures (1001–10000K) under thermostatic versus photothermal conditions, revealing that growth kinetics within optimal temperature ranges deviate from Arrhenius models, with color-temperature dictating thermal synergism or antagonism. Focusing on 1968K, physiological and transcriptomic analyses demonstrated that dynamic thermal gradients (ΔT=4.8°C) accelerated state transitions and sustained an efficient electron transport chain. Compared to thermostatic conditions, ETP and ETI resulted in 48% and 24% increases in electron transfer efficiency, respectively. ETP also synergistically upregulated carbon metabolism, optimizing energy conversion. In contrast, ETI obstructed electron transfer at the cytochrome b₆f complex, triggering photoprotection and reducing growth rate by 42% and cell density by 19% compared to ETP. Field data confirmed that photothermal fluctuations govern the timing of diurnal bloom peaks. These findings highlight light's dual role in photosynthesis and thermal feedback, urging reassessment of light-temperature synergies and advancing bloom mitigation strategies.

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光下水生环境中色温对藻类生长的热效应被忽视

光和温度对藻华起着关键的调节作用；然而，实验室研究经常固定温度，忽略光的热效应（内源性光热效应，ETP）或将其等同于外部加热（外源性热输入，ETI）。色温决定光子分布，影响水生系统的热强度。在这项研究中，铜绿微囊藻在恒温和光热条件下暴露于5种色温（1001-10000K）下，发现在最佳温度范围内的生长动力学偏离了Arrhenius模型，色温决定了热协同作用或拮抗作用。关注1968K，生理和转录组学分析表明，动态热梯度（ΔT=4.8°C）加速了状态转变，并维持了有效的电子传递链。与恒温条件相比，ETP和ETI分别使电子传递效率提高48%和24%。ETP还协同上调碳代谢，优化能量转换。相比之下，与ETP相比，ETI阻碍了细胞色素b6f复合物的电子转移，引发光保护，使生长速度降低42%，细胞密度降低19%。野外数据证实，光热波动支配着日开花高峰的时间。这些发现强调了光在光合作用和热反馈中的双重作用，敦促重新评估光-温协同作用并推进缓解华花的策略。

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.