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Aip1p Dynamics Are Altered by the R256H Mutation in Actin
Published on: July 30, 2014
Arabidopsis H+-PPase AVP1 regulates auxin-mediated organ development
Jisheng Li1, Haibing Yang, Wendy Ann Peer
1Department of Plant Science, University of Connecticut, Storrs, CT 06268, USA.
Abstract:
The transport of auxin controls developmental events in plants. Here, we report that in addition to maintaining vacuolar pH, the H+-pyrophosphatase, AVP1, controls auxin transport and consequently auxin-dependent development. AVP1 overexpression results in increased cell division at the onset of organ formation, hyperplasia, and increased auxin transport. In contrast, avp1-1 null mutants have severely disrupted root and shoot development and reduced auxin transport. Changes in the expression of AVP1 affect the distribution and abundance of the P-adenosine triphosphatase and Pinformed 1 auxin efflux facilitator, two proteins implicated in auxin distribution. Thus, AVP1 facilitates the auxin fluxes that regulate organogenesis.
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