Glycolate oxidase-dependent H₂O₂ production regulates IAA biosynthesis in rice.

ABSTRACT:

Background

Glycolate oxidase (GLO) is not only a key enzyme in photorespiration but also a major engine for H₂O₂ production in plants. Catalase (CAT)-dependent H₂O₂ 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 H₂O₂ production in IAA regulation.

Results

In this study, we found that in glo mutants of rice, as H₂O₂ levels decreased IAA contents significantly increased, whereas high CO₂ abolished the difference in H₂O₂ and IAA contents between glo mutants and WT. Further analyses showed that tryptophan (Trp, the precursor for IAA biosynthesis i

SUBMITTER: Li X 

PROVIDER: S-EPMC8261990 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature