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在 diel 周期中获取资源,以及快速增长的成本

Kevin J Flynn¹, Andrew Yu Morozov^2,3

¹Plymouth Marine Laboratory, Plymouth, United Kingdom.

PLoS computational biology

|June 6, 2025

概括

微藻与细胞分裂平衡资源获取,以优化生长. 微藻的快速生长受限于光线的可用性,在某些条件下有利于更大的细胞.

科学领域:

*生理生态生态学
* 计算机建模 * 计算建模
* 微生物海洋学

背景情况:

* 光合作用生物,特别是微藻类,面临着在有限的每日时间内平衡资源获取与细胞周期事件的挑战.
* 浮游生物微藻对于全球碳固定至关重要,它们的生长依赖于快速吸收和保留资源.
*一个关键的问题是微藻的最佳生理策略,以最大限度地增长在不断变化的资源供应条件下.

研究的目的:

*使用新型计算模型研究微藻生长的最佳生理配置.
* 探索最大生长率 (Umax) 和光:日分数 (LD) 等因素如何影响最佳细胞策略.
* 了解微藻生长速度与资源获取效率之间的权衡.

主要方法:

* 基于扩展配额概念的计算机模拟模型的开发,包括内部碳池 (代谢物C和核心C).
* 建模成长为代谢碳与总碳的比率的函数 (MC/(MC + CC)).
*模拟代谢物池大小和资源获取率之间的动态反相互作用.

主要成果:

* 该模型成功地复制了在不同的光:日分数 (LD) 下观察到的微藻生长模式以及碳固定中下午低压现象.
*最佳的资源获取率与Umax/LD相比例,而最佳的代谢物池大小与LD/DV (分裂时间) 相比例.
* 快速生长的微藻被限制在具有较高LD的环境中,这表明地理和季节性限制.

结论:

* 微藻的增长速度更快会造成惩罚,限制它们的分布在高LD环境中.
*较大,真空化微藻 (如藻) 可能由于更大的代谢池而具有优势,特别是在高LD条件下.
*这项研究提供了有关微藻生产力和生态分布的生理性权衡的见解.

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