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This study aims to investigate how photosynthesis regulation influences carbon and nitrogen assimilation in Anabaena sp. PCC 7120.

May 10, 2026New Phytologist0 citationsOpen Access

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Photosynthesis regulation impacts carbon and nitrogen assimilation in the diazotrophic cyanobacterium Anabaena sp. PCC 7120

ASAnna SantinUniversity of Padua MSMattia StortiUniversity of Padua MMMassimo MezzavillaUniversity of Padua

Key Points

This study aims to investigate how photosynthesis regulation influences carbon and nitrogen assimilation in Anabaena sp. PCC 7120.
Examined photosynthetic electron transport under diazotrophic conditions.
Analyzed a mutant strain affecting nitrogen transport between cell types.
Investigated metabolic connections between assimilation pathways.
Increased photosynthetic electron transport under diazotrophic conditions was observed.
Modified electron pathways contributed to enhanced nitrogen fixation.
Photosynthetic regulation significantly impacted the synergy between carbon and nitrogen assimilation pathways.

Abstract

fixation activity mainly relied on the C supply. Upon diazotrophic conditions, the total photosynthetic electron transport increased, with a modified contribution of different electron pathways. A mutant strain affected in the vehiculation of fixed N between cell types showed that the modulation of photosynthesis depended on the metabolic connection between assimilation pathways. Overall, data showed that the regulation of photosynthetic electron fluxes is a major component of the synergic metabolic relationship between C and N assimilation pathways upon dynamic environmental conditions.

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Photosynthesis regulation impacts carbon and nitrogen assimilation in the diazotrophic cyanobacterium Anabaena sp. PCC 7120

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Abstract

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