Impacts of Iron on Phosphate Starvation-Induced Root Hair Growth in Arabidopsis
May 2021
TLDR Iron influences root hair growth during phosphate starvation by affecting auxin distribution and vesicle trafficking.
The study investigated the role of iron (Fe) in root hair growth in Arabidopsis under phosphate (Pi) sufficiency and deficiency. It found that Fe availability significantly influenced root hair growth by modulating vesicle trafficking, auxin distribution, and phosphate starvation responses. Optimal root hair growth occurred at specific Fe concentrations, with 20 μM Fe under Pi deficiency and 350 μM Fe under sufficiency. Fe acted upstream of the RHD6/RSL1 and RSL4/RSL2 pathways, and auxin was essential for Fe-mediated growth under Pi deficiency. The study highlighted the involvement of PHR1 in Fe-triggered growth and emphasized the local nature of Fe's effect on root hair development, providing insights into the complex interactions between Fe availability, hormone signaling, and nutrient responses.