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Angiosperm Flora of India

Competitive canalization of PIN-dependent auxin flow from axillary buds controls pea bud outgrowth

Publication Type:Journal Article
Year of Publication:2011
Authors:Balla, J, Kalousek, P, Reinöhl, V, Friml, J, Procházka, S
Journal:The Plant Journal
Volume:65
Issue:4
Date Published:2011
ISBN Number:1365-313X
Keywords:apical dominance, auxin transport, bud outgrowth, canalization, pea, PIN1 immunolocalization
Abstract:

Shoot branching is one of the major determinants of plant architecture. Polar auxin transport in stems is necessary for the control of bud outgrowth by a dominant apex. Here, we show that following decapitation in pea (Pisum sativum L.), the axillary buds establish directional auxin export by subcellular polarization of PIN auxin transporters. Apical auxin application on the decapitated stem prevents this PIN polarization and canalization of laterally applied auxin. These results support a model in which the apical and lateral auxin sources compete for primary channels of auxin transport in the stem to control the outgrowth of axillary buds.

URL:http://dx.doi.org/10.1111/j.1365-313X.2010.04443.x
Short Title:The Plant Journal
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