Protein phosphatase PP2C19 controls hypocotyl phototropism through the phosphorylation modification of NONPHOTOTROPIC HYPOCOTYL3 in Arabidopsis.

ABSTRACT: Plants exhibit shoot growth in the direction of the light source to facilitate photosynthesis, known as positive phototropism. In Arabidopsis hypocotyl phototropism, it is thought that a gradient of the signal intensity of the blue light (BL) photoreceptor phototropin1 (phot1) between the light-irradiated and shaded sides leads to the differential growth of hypocotyls. The intensity of phot1 signal is regulated not only by the protein kinase activity of phot1 but also by the phosphorylation status of the NONPHOTOTROPIC HYPOCOTYL3 (NPH3) protein, which has a dark form and a BL form of the phosphorylation modification. Previous studies have shown that phot1 drives the forward reaction from the dark form to the BL form of NPH3. However, the molecular mechanism underlying the reverse reaction

SUBMITTER: Sakai T 

PROVIDER: S-EPMC11775391 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature