light-response
Light-response encompasses the physiological and developmental processes by which plants perceive and respond to light stimuli, including phototropism, photosynthesis regulation, and photoperiodism. This process is fundamental to plant survival and productivity, controlling seedling establishment, growth orientation, flowering time, and photosynthetic efficiency. Understanding light-response mechanisms is essential for advancing agricultural practices and predicting how plants adapt to changing environmental light conditions.
PubMed · 2026-02-20
Plants have light-sensing proteins that help them bend toward light and move their chloroplasts. Two enzymes (PP2C phosphatases) control how long this response stays active by removing chemical marks. When these enzymes fail, plants can't bend toward light properly, suggesting they're critical for seedlings to break through soil.
PP2C19 and PP2C35 phosphatases regulate NPH3 dephosphorylation at S744, controlling phototropism; pp2c mutants show sustained phosphorylation and reduced light-bending response
Clade L PP2Cs control both auxin-dependent (phototropism) and auxin-independent (chloroplast movement) light responses, with greater defects in double mutants indicating functional redundancy
PP2C19 defects impair chloroplast light-response movement in both Arabidopsis and Marchantia, demonstrating conserved function across plant species
