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Science. 2005 Oct 7;310(5745):121-5.

Arabidopsis H+-PPase AVP1 regulates auxin-mediated organ development.

Author information

1
Department of Plant Science, University of Connecticut, Storrs, CT 06268, USA.
2
PA St U, University Park

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.

PMID:
16210544
DOI:
10.1126/science.1115711
[Indexed for MEDLINE]
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