FIND ARTICLE

Gibberellins signal perception and transduction

Isolated aleurone cells and protoplasts of cereal grains are particularly useful model system for studying of gibberellin signaling. Up to now, the identity of the receptor protein is unknown, but its activity in cereal aleurone has been localized to the plasma membrane. The gibberellin-signaling pathways identified in aleurone cells involve heterotrimeric G proteins, 1,4,5-inositol triphosphate, Ca2+, calmodulin, cGMP, cytosolic pH, protein phosphorylation, and transcription factors.

Perception and transduction of auxin signal

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.

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

Editorial address:
Katedra i Zakład Histologii i Embriologii Uniwersytetu Medycznego w Poznaniu, ul. Święcickiego 6, 60-781 Poznań, tel. +48 61 8546453, fax. +48 61 8546440, email: mnowicki@ump.edu.pl

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