Plant Biology

Targeting tip growth

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Science  02 Dec 2016:
Vol. 354, Issue 6316, pp. 1115
DOI: 10.1126/science.354.6316.1115-b

Tip growth, which characterizes cells as diverse as root hairs and brain neurons, depends on secretory vesicles to add new plasma membrane in a defined subdomain. Bloch et al. show that in growing Arabidopsis pollen tubes, the exocyst subunit SEC3a is a target for secretory vesicles at the tip. SEC3a localization defines the axis of growth and the domain where new pectin is added to the cell wall. Pollen tubes of tobacco, which are fatter than those of Arabidopsis, showed more complex patterns: During isotropic growth, SEC3a was distributed in a broad subapical domain, whereas during rapid elongation growth, SEC3a was localized to the apical tip.

Plant Physiol. 172, 980 (2016).

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