Research Article

A novel seven-transmembrane protein may be a receptor involved in high-light stress signalling and response in Arabidopsis

Aleksandra Dabrowska

Department of Biological Sciences, University of Essex, Colchester, UK

Received:

28 Sept 2009

Accepted:

19 Jan 2010

Published:

24 Feb 2010

Volume:

3

Issue:

1

Keywords:

Arabidopsis thaliana, abscisic acid, high-light stress, seven-transmembrane domain receptor, ELIP

Abstract:

Stress response signalling pathways are understood only partially in plants. This investigation provides information on a putative membrane-localized receptor that can be added to the collection of high-light (HL) stress–response-mediating proteins. Differences in the expression of a range of antioxidant genes in wild-type Arabidopsis thaliana and a null mutant in At4g21570.1 gene were evaluated using quantitative real-time polymerase chain reaction. It has been found that At4g21570.1 has an effect on the expression of a number of HL-responsive genes encoding ascorbate peroxidase 2, early light-induced protein 1 (ELIP1), type II peroxiredoxin F and two types of glutathione-S-transferases. Due to the fact that some of these genes were reported to be influenced by abscisic acid (ABA), presented results suggest that the investigated putative seven-transmembrane protein (7TMP) may be the missing link between ABA and G-protein α-subunit in plants. However, further study is needed in order to exclude the involvement of other factors, such as hydrogen peroxide, the accumulation of which in a mutant could also contribute to these changes.

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