A Review on Si Uptake and Transport System

Area of Science:

• Plant Biology
• Biochemistry
• Environmental Science

Background:

• Silicon (Si) was historically considered non-essential for plants due to its abundance.
• Recent research highlights Si's vital role in plant stress tolerance, necessitating study of its uptake and transport.
• Plant root absorption of silicic acid and its translocation via transporters are key to Si accumulation.

Purpose of the Study:

• To review recent research on silicon transporters in angiosperms and cryptogams.
• To elucidate the mechanisms of silicon uptake and transport in diverse plant species.
• To highlight Si-accumulating species, particularly within eudicots, and their transporter-mediated Si uptake.

Main Methods:

• Literature review of recent studies on silicon transporters.
• Analysis of data on silicon accumulation in various plant families, including monocots and eudicots.
• Focus on the role of influx and efflux transporters in plant plasma membranes.

Main Results:

• Identified diverse Si transporter locations and expression patterns across plant species.
• Demonstrated species-specific differences in silicon accumulation.
• Highlighted the importance of transporters in mediating Si uptake, even in low/intermediate accumulating eudicots.

Conclusions:

• Silicon transporters are critical for silicon uptake and distribution in plants, influencing stress tolerance.
• Understanding these transporters provides insights into plant adaptation to environmental stresses.
• Further research into Si transporters in understudied groups like eudicots is essential for a comprehensive understanding of plant silicon nutrition.