seedling-establishment
Seedling establishment is the critical developmental phase in which a germinating seed transitions into an independent plant capable of autotrophic growth and resource acquisition. This stage represents a major bottleneck in plant fitness and survival, as young seedlings face heightened vulnerability to environmental stress, competition, and pathogenic threats. Understanding the mechanisms underlying seedling establishment is fundamental to plant biology, with direct applications to improving agricultural productivity, forest regeneration, and ecosystem resilience.
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
