Glycolate oxidase-dependent HO production regulates IAA biosynthesis in rice.

Background: Glycolate oxidase (GLO) is not only a key enzyme in photorespiration but also a major engine for HO production in plants. Catalase (CAT)-dependent HO decomposition has been previously reported to be involved in the regulation of IAA biosynthesis. However, it is still not known which mechanism contributed to the HO production in IAA regulation.