Temperature stress effects in Quercus suber leaf metabolism

Area of Science:

• Plant Science
• Metabolomics
• Molecular Biology

Background:

• Climate change necessitates understanding plant responses to environmental shifts.
• Quercus suber (Evergreen Oak) is a key Mediterranean species facing climate variability.
• Leaf metabolism and gene expression are critical indicators of plant adaptation.

Purpose of the Study:

• To investigate the effects of contrasting temperatures on Quercus suber leaf metabolism.
• To analyze the accumulation of soluble metabolites under different temperature regimes.
• To examine the expression levels of genes involved in the shikimate and phenylpropanoid pathways.

Main Methods:

• Controlled environmental conditions were used to grow Quercus suber plants at 10°C and 28°C for 53 days.
• Nuclear Magnetic Resonance (NMR) spectroscopy was employed to quantify major soluble metabolites.
• Quantitative, real-time RT-PCR was used to measure the relative transcript levels of key enzymes (CS, PAL, CAD, ChS).

Main Results:

• At 10°C, higher concentrations of sucrose, quercitol, and catechin were observed, along with increased PAL and ChS transcript levels.
• At 28°C, higher concentrations of quinic acid were found, alongside elevated CS and CAD transcript levels.
• Contrasting temperatures induced significant changes in metabolite profiles and gene expression.

Conclusions:

• Temperature significantly influences Quercus suber leaf metabolism and associated gene expression.
• Different temperature regimes activate distinct metabolic pathways and gene expression patterns.
• Further research into extreme temperature effects is crucial for predicting Quercus suber's response to climate change.