The photosynthetic response to iron limitation and iron resupply in diatoms

该项目的目的是阐明允许硅藻修改其光合装置的化学计量和下调碳固定以在铁限制条件下生长的机制。由于海洋大部分地区长期存在铁限制条件，因此了解硅藻如何从铁限制条件中快速恢复并恢复高光合速率非常重要。我们建议在这里研究的下调和恢复光合作用（光吸收和固碳）的驯化过程中遇到的铁限制和铁再供应，分别。由于硅藻对铁的需求非常依赖于光照强度，因此将研究光合机构的重塑作为光照强度和铁供应的函数。这将首先通过以下的光合生理和FCP基因的基因表达已知的变化作为一个功能的铁供应。此外，我们想确定的具体作用，三个FCPs在适应反应铁限制。

The aim of this project is to elucidate the mechanisms that allow diatoms to modify the stoichiometry of their photosynthetic apparatus and down-regulate carbon fixation in order to grow under iron limited conditions. Because of the chronic iron-limited conditions in vast areas of the ocean, it is important to understand how diatoms can rapidly recover from the iron limited conditions and resume high photosynthetic rates. We propose to study here the down-regulation and recovery of photosynthesis (light absorption and carbon fixation) encountered during the acclimation to Fe-limitation and iron-resupply, respectively. As the diatom iron requirements are very dependent on light intensity, the remodelling of the photosynthetic apparatus will be studied as a function of both light intensity and iron supply. This will be done initially by following the photosynthetic physiology and gene expression of FCP genes known to vary as a function of Fe supply. Furthermore we want to identify the specific role of three FCPs in the acclimation response to iron-limitation.