Abstract
Chloroplast positioning is dependent upon environmental light conditions. In Arabidopsis, chloroplast relocation movement is controlled by the phototropin gene family. While chloroplast accumulation movement is controlled by phot1 and phot2, chloroplast avoidance movement is mediated only by phot2, Experiments using a phot1 mutant show that this phototropin family member does not contribute to chloroplast movement.
In the fern Adiantum capillus-veneris, phototropin family genes has also been found. Mutants deficient in chloroplast avoidance movement have been isolated, and the defects traced to mutations in phot2 genes. When phot2 cDNA were introduced into the mutant cells by particle bombardment, the avoidance movement was recovered, indicating that phot2 is the photoreceptor of the response in Adiantum, as it is in Arabidopsis.
In this symposium, we will talk about the roles of phototropin family genes in chloroplast relocation movement.
