Trophic status of Chlamydomonas reinhardtii influences the impact of iron deficiency on photosynthesis

摘要: To investigate the impact of iron deficiency on bioenergetic pathways in Chlamydomonas, we compared growth rates, content, and photosynthetic parameters systematically acetate versus CO(2)-grown cells. Acetate-grown cells have, predictably (2-fold) greater abundance respiration components but also, counter-intuitively, more chlorophyll a per cell basis. We found that phototrophic are less impacted by this correlates with their higher content basis, suggesting capacity/ability for assimilation metabolic state. Phototrophic maintain both respiratory function associated Fe-containing proteins conditions where heterotrophic lose capacity have reduced oxygen evolution activity. Maintenance NPQ might contribute to protection apparatus iron-limited high rates suppressing photosynthesis increasing instead respiration. These also able plastoquinone pool.