Brassinosteroids signaling via BZR1 down-regulates expression of ACC oxidase 4 to control growth of Arabidopsis thaliana seedlings.

ABSTRACT: ProACO4-GUS expression and RT-PCR analysis revealed that ACO4 is predominantly expressed in shoots of Arabidopsis seedlings under light conditions. ACO4-overexpressed mutant 35S-ACO4 produced more ethylene relative to the wild-type, which resulted in reduced growth of Arabidopsis seedlings. The abnormal growth of seedlings recurred after the application of Co²⁺ ions, suggesting that ACO4 is a functional ACO necessary to regulate the growth and development of Arabidopsis seedlings. Exogenously-applied brassinosteroids (BRs) inhibited the expression of ACO4, and an enhanced ACO4 expression was found in det2, a BR-deficient mutant. Additionally, expression of ACO4 was decreased in bzr1-D (a BZR1-dom

SUBMITTER: Moon J 

PROVIDER: S-EPMC7194390 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature