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- W4366331197 abstract "SUMMARY Gravity controls directional growth of plants, and the classical starch-statolith hypothesis proposed more than a century ago postulates that amyloplast sedimentation in specialized cells initiates gravity sensing, but the molecular mechanism remains mysterious. Here, we report that gravistimulation by reorientation triggers the Mitogen-Activated Protein Kinase (MAPK) signaling-mediated phosphorylation of LAZY proteins, the key regulators of gravitropism accumulated more on the lower side of the plasma membrane in columella cells in regular growth Arabidopsis . Phosphorylation of LAZY increases its interaction with several TOC proteins on the surface of amyloplasts, facilitating the translocation of LAZY proteins from the plasma membrane to the amyloplasts. Amyloplast sedimentation subsequently guides LAZY to relocate to the new lower side of the plasma membrane in columella cells, where LAZY induces asymmetrical auxin distribution and differential growth. Together, this study provides a molecular interpretation for the starch-statolith hypothesis: the organelle movement-triggered molecular polarity formation." @default.
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- W4366331197 date "2023-04-18" @default.
- W4366331197 modified "2023-09-23" @default.
- W4366331197 title "Amyloplast sedimentation repolarizes LAZYs to achieve gravity sensing in plants" @default.
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- W4366331197 doi "https://doi.org/10.1101/2023.04.17.537121" @default.
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