Abstract
Tip growth is an extreme form of polar growth modulated by both intrinsic and extrinsic spatial cues. Pollen tubes and root hairs have been used as model systems to investigate tip growth signaling in higher plants. Recent studies have focused on tip-localized Ca 2+ gradients and Rho GTPases in pollen tubes and a series of mutants affecting root hair tip growth. These molecular and genetic markers will serve as stepping stones towards uncovering tip growth pathways in plants.
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