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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


28 Sept 2009


19 Jan 2010


24 Feb 2010






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


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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