Abstract
In higher plants, peroxisomes are known to differentiate into several classes. Glyoxysomes that are abundant in cotyledons, contain enzymes of β-oxidation and glyoxylate cycle to degrade storage lipid for postgerminative growth of oilseed plants. Leaf peroxisomes that are found in green leaves, function together with chloroplasts and mitochondria in phororespiration. Malate dehydrogenase (MDH) is an enzyme to catalayze the interconversion of malate and oxaloacetate. Two isoforms of peroxisomal MDH (PMDH) have been identified, the glyoxysome-type isoform, PMDH1 (At2g22780) which is involved in glyoylate cycle and in β-oxidation, and the leaf peroxisome-type isoform, PMDH2 (At5g09660) which is induced by light but those function are not elucidated. We investigated pmdh2 and pmdh1pmdh2 mutants of Arabidopsis to elucidate physiological function of PMDH2. In this study, we report the phenotypes of these mutants that are grown under high light condition and discuss the function of PMDH2 in leaves.
