Send to

Choose Destination
Plant Mol Biol. 2002 Jun-Jul;49(3-4):357-72.

Secondary messengers and phospholipase A2 in auxin signal transduction.

Author information

Universität Hannover, Institut für Zierpflanzenbau, Baumschule und Pflanzenzüchtung, Hannover, Germany.


Despite recent progress auxin signal transduction remains largely scetchy and enigmatic. A good body of evidence supports the notion that the ABP1 could be a functional receptor or part of a receptor, respectively, but this is not generally accepted. Evidence for other functional receptors is lacking, as is any clearcut evidence for a function of G proteins. Protons may serve as second messengers in guard cells but the existing evidence for a role of calcium remains to be clearified. Phospholipases C and D seem not to have a function in auxin signal transduction whereas the indications for a role of phospholipase A2 in auxin signal transduction accumulated recently. Mitogen-activated protein kinase (MAPK) is modulated by auxin and the protein kinase PINOID has a role in auxin transport modulation even though their functional linkage to other signalling molecules is ill-defined. It is hypothesized that signal transduction precedes activation of early genes such as IAA genes and that ubiquitination and the proteasome are a mechanism to integrate signal duration and signal strength in plants and act as major regulators of hormone sensitivity.

[Indexed for MEDLINE]

Supplemental Content

Loading ...
Support Center