Response of growth and photosynthesis of marine red tide alga Heterosigma akashiwo to iron and iron stress condition

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Heterosigma akashiwo, a red tide alga, was grown in Fe-deficient and Fe-replete batch cultures. Cell final yields and the growth rate were limited when Fe was below 10 nM and alleviated with 100 nM Fe. By comparison with the results under Fe-replete conditions, chlorophyll a-specific and cell-specific light saturated net photosynthetic capacity (Pmchl a and Pmcell), dark respiration rate (Rdchl a and Rdcell) and apparent photosynthetic efficiency (αchl a and αcell) decreased proportionately, whereas the cells became light saturated at higher irradiance under Fe stress (Fe-limited conditions).