Light-dependent expression of two catalase subunits in leaves of barley seedlings

Abstract

EP-CAT is not (Havir and McHale, 1989). For tobacco, the form with low peroxidative activity has been suggested In young barley seedlings high levels of a 57 kDa cata- to be involved in photorespiration, whilst for the form lase subunit were found in the dark, while increased with enhanced peroxidative activity, which was induced levels of a 53 kDa subunit were detected in the leaves under CO 2 -enrichment, no clear role has been established after growth in the light. A catalase-deficient mutant (Havir and McHale, 1987). fails to upregulate expression of the 53 kDa subunit A barley mutant in which catalase activity in leaves of after transfer to a high light intensity. mature plants was found to be less than 10% of that of the wild type, grows poorly in normal air and can only