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 screened a number of the peroxisome unusual positioning mutants (peup) from EMS treated mutant lines. Some mutants show aggregation of peroxisome (peup1), whereas the other shows that most peroxisomes flow in the cytosol (peup4) and defective in interaction with chloroplast. Here, we further studied the interaction of peroxisome with chloroplast in leaf mesophyll cells of mya2-XI-k double mutants, defective in peroxisome motility. However, the interaction took place normally. To characterize peups 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.
