Abstract
LKP2 protein contains 3 functional domains: the LOV, F-box, and kelch repeat domains. The LOV domain is involved in the blue light perception and protein-protein interaction. The F-box motif is found in F-box proteins and the kelch repeat is a protein-protein interaction module. Arabidopsis plants overexpressing LKP2 cDNA exhibited the elongated hypocotyl under light conditions, delayed flowering time under long-day conditions, and arrhythmia under continuous light or dark conditions. We used DNA microarray analysis to identify the genes with altered expression levels in the LKP2 overexpressor. Microarray analysis revealed that 0.35% of the total genes in the LKP2 overexpressor were upregulated by more than 2-folds, compared to the expression levels in the wild type. The upregulated genes included some plant hormone-responsive and stress-responsive genes. In order to confirm whether LKP2 functions in stress responses, we assessed the expression levels of stress-responsive genes and the stress responses in the LKP2 overexpressor.
