Roles of Small-Molecule Compounds in Plant Adventitious Root Development

Area of Science:

• Plant Biology
• Molecular Biology
• Horticultural Science

Background:

• Adventitious roots (ARs) are vital lateral roots originating from stems and leaf petioles.
• Small signaling molecules play critical roles in various plant growth and developmental processes.
• These molecules are increasingly recognized for their involvement in AR formation.

Purpose of the Study:

• To review the functions and mechanisms of small signaling molecules in adventitious rooting.
• To explore the crosstalk and gene regulatory effects of these compounds during AR development.
• To highlight their importance in horticultural applications, especially under stress conditions.

Main Methods:

• Literature review focusing on small signaling molecules and AR formation.
• Analysis of existing research on compounds like nitric oxide (NO), ethylene (ETH), and reactive oxygen/nitrogen species.
• Synthesis of information on gene expression regulation and crosstalk between signaling pathways.

Main Results:

• Identified key small signaling molecules (NO, H2, H2S, CO, CH4, ETH, H2O2) involved in AR induction and development.
• Demonstrated that these molecules regulate AR formation by influencing cell division, auxin transport, and related gene expression.
• Highlighted the crosstalk between different signaling molecules in the AR process.

Conclusions:

• Small signaling molecules significantly enhance adventitious rooting by modulating antioxidant, water balance, and photosynthetic systems.
• These compounds positively impact horticultural plants, particularly under environmental stresses.
• Further exploration of these molecules is crucial for advancing horticultural studies and applications.