Abstract
In the photosynthetic tissues, peroxisome contains enzymes that participate in photorespiration and share the metabolic pathway with chloroplast and mitochondrion. Hence, it has been thought that peroxisome is localized close to chloroplast and mitochondrion for efficient metabolic regulation. Previously, we reported that motility and morphology of peroxisome in photosynthetic cells are changing dynamically under the proper light condition by action of actin cytoskeleton. Here, we screened a number of the peroxisome unusual positioning mutants (peup) from EMS treated mutant lines. Some mutants show aggregation of peroxisomes, whereas the other show that most peroxisomes flows in the cytosol and defective in interaction with chloroplast. To characterize peup mutants, we further analyzed plant growth phenotype under several conditions. These results showed proper localization of peroxisome is essential for photosynthesis and plant normal growth.
