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In this study, researchers found that the efflux of calcium in root hairs of Arabidopsis thaliana, particularly through the ER-localized ACA2 and ACA7, is crucial for modulating cytoplasmic calcium signals and enabling proper root hair growth, with disruptions leading to impaired elongation.

This study observed that while calcium influx does not initiate root hairs in Arabidopsis thaliana, it may be crucial for sustaining their elongation through elevated calcium levels at the root hair tip.

This review outlines the current understanding of how pH contributes to root hair development and reports no new experimental findings.

This study found that endothelin produced by hair follicle progenitors activates contractions in dermal sheath cells, facilitating hair follicle regression in the growth cycle.