Phenanthrene-responsive microRNAs and their targets in wheat roots

Area of Science:

• Plant molecular biology
• Environmental toxicology
• Agricultural science

Background:

• MicroRNAs (miRNAs) are crucial regulators of plant growth and stress responses.
• Polycyclic aromatic hydrocarbons (PAHs) are widespread environmental pollutants with unknown effects on plant miRNA regulation.
• Understanding miRNA roles in PAH uptake is vital for phytoremediation and crop resilience.

Purpose of the Study:

• To identify phenanthrene-responsive miRNAs and their target genes in wheat roots.
• To elucidate the regulatory mechanisms of miRNAs in plant response to PAH contamination.
• To provide insights for developing PAH-resistant crops.

Main Methods:

• Small RNA high-throughput deep sequencing was employed to profile miRNA expression in wheat roots.
• Bioinformatic analyses were used to identify differentially expressed miRNAs and predict their target genes.
• Gene expression analysis was performed to validate miRNA-target interactions.

Main Results:

• 108 conserved and non-conserved miRNA members from 82 families were identified.
• 11 miRNAs showed differential expression in response to phenanthrene, with four up-regulated and seven down-regulated.
• Specific miRNAs (e.g., miR156, miR164, miR398, miR1121, miR9773) were implicated in regulating growth, oxidative stress, and phenanthrene metabolism.

Conclusions:

• Phenanthrene exposure induces significant changes in wheat root miRNA expression profiles.
• Identified miRNAs are involved in regulating plant responses to PAH uptake and stress.
• These findings support the use of miRNAs in developing genetically resistant crops for phytoremediation of PAH-contaminated environments.