Temporal aspects of copper homeostasis and its crosstalk with hormones

A transcriptional regulatory network coordinates environmental and hormonal signaling with developmental pathways to enhance micronutrient acquisition efficiency.

Hormones may affect copper uptake into roots, intracellular trafficking and compartmentalization, and long-distance transport to developing vegetative and reproductive tissues.

Putative hormone-dependent regulatory elements in promoters of copper transporter genes suggest hormonal regulation of copper requirements during plant development.

Copper availability influences hormone biosynthesis and signaling, suggesting reciprocal regulation under temporal control by the circadian clock.

Hormonal pathways including abscisic acid, gibberellins, ethylene, auxins, and jasmonates are under direct clock and light control, and are implicated in metal homeostasis matching nutrient availability to growth requirements while preventing metal toxicity.

The circadian clock participates in temporal coordination of plant nutrition by adapting metabolic responses to daily oscillations.

Plants temporally adapt expression of copper homeostasis components to deliver copper to cuproproteins while limiting oxidative damage associated with copper uptake and photosynthetic reactions during light hours.