Diel Regulation in Spinach Synchronizes Nitrogen Assimilation via Transcriptional Gating

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Key Points

To explore how circadian rhythms influence nitrogen assimilation in spinach and their relation to nitrogen levels.
Profiling of spinach grown under high- and low-nitrogen across four diel phases.
Integration of RNA-sequencing data with gas exchange measurements and enzyme activity assessments.
Analysis of transcript levels and amino acid profiles during different light and dark phases.
Nitrogen sufficiency increases chlorophyll content and photosynthetic efficiency, with activity peaks in the middle of light phase.
Expression of nitrogen-assimilation genes peaks at dark-to-light transition, followed by enzyme activity lagging by one phase.
Nitrogen deficiency leads to ROS accumulation and activation of DNA repair genes.

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Reveals how nitrogen levels affect nitrogen assimilation timing in spinach, suggesting a link between nitrogen and circadian rhythms.

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Analin et al. (2026) studied this question.

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