Diurnal and light regulation of sulphur assimilation and glucosinolate biosynthesis in Arabidopsis.

ABSTRACT: Glucosinolates are a major class of sulphur-containing secondary metabolites involved in plant defence against pathogens. Recently many regulatory links between glucosinolate biosynthesis and sulphate assimilation were established. Since sulphate assimilation undergoes diurnal rhythm and is light regulated, this study analysed whether the same is true for glucosinolate biosynthesis. The levels of glucosinolates and glutathione were found to be higher during the day than during the night. This agreed with variation in sulphate uptake as well as activity of the key enzyme of the sulphate assimilation pathway, adenosine 5'-phosphosulphate reductase. Correspondingly, the flux through sulphate assimilation was higher during the day than during the night, with the maximum flux through primary as

SUBMITTER: Huseby S 

PROVIDER: S-EPMC3580815 | biostudies-literature | 2013 Feb

REPOSITORIES: biostudies-literature