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A pathway of auxin action, from perception to response, has not been completely defined, as yet. However, there are now good evidences that auxin-binding protein ABP1, which is associated with a membrane docking protein is a G-protein-coupled receptor. The signal transduction pathway appear to involve activation of phospholipase A2 leading to the production of lipid second messengers which activate the plasma membrane H+-ATPase by a protein kinase-dependent mechanism. Increasing evidences now suggest that MAP kinase pathway is involved in mediating auxin responses. Studies of the auxin mutants (axr1, tir1, sur1) of Arabidopsis thaliana have focused attention on the role of ubiquitin-mediated cell cycle regulation in auxin response.
Changes in the transcription of specific auxin-responsive genes are among the earliest responses to applied auxin. The Aux/IAA genes are the best-studied family of early auxin-response genes. Several results suggest that at least some of the Aux/IAA proteins are involved in controlling transcription. Functional analysis of several auxin-specific promoters identified a number of functionally defined auxin response elements (AuxREs) and auxin response domains (Aux RDs). A family of transcription factors, referred to as auxin-response factors (ARFs), has been identified and shown to bind to auxin-response elements.

The Editorial Board
Andrzej Łukaszyk - przewodniczący, Zofia Bielańska-Osuchowska, Szczepan Biliński, Mieczysław Chorąży, Aleksander Koj, Włodzimierz Korochoda, Leszek Kuźnicki, Aleksandra Stojałowska, Lech Wojtczak

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