Chemical tag on plant protein helps roots branch out better
Sui J, Yin Q, Chen Y, Zhang L, Yu X
Plant Signaling
The root systems that anchor your tomatoes and help your garden survive dry spells depend on this exact molecular process to decide when and where to send out new lateral roots.
Plants use a hormone called auxin to tell their roots where to branch out and grow, but scientists didn't fully understand how this signal gets fine-tuned at the molecular level. This research found that a small chemical tag, called SUMO, gets attached to a key protein and helps it team up with another protein to switch on the genes needed for new root branches to form. When this tagging system is broken, plants grow fewer lateral roots and respond poorly to the hormone, showing just how precisely plants control their root architecture.
Key Findings
SIZ1-mediated SUMOylation controls nearly 40% of auxin-responsive genes specific to normal (Col-0) plants
SUMOylation of the LBD29 protein strengthens its interaction with ARF7 to activate root-branching genes, and integrated RNA-seq and mass spectrometry identified 103 co-regulated genes
Mutant plants lacking functional SIZ1 (siz1-2 and siz1-3) show reduced auxin responsiveness and impaired lateral root development, and auxin induces SIZ1 itself in an ARF7-dependent feedback loop
chevron_right Technical Summary
Scientists discovered a molecular switch that fine-tunes how plant roots branch out in response to a growth hormone, revealing a chemical 'tagging' system that helps roots grow more efficiently to find water and nutrients.
Abstract Preview
Original paper
SIZ1-Mediated SUMOylation of LBD29 Recruits ARF7 to Fine-Tune Auxin Signaling in Lateral Root Development.
Auxin signaling orchestrates plant development through TRANSPORT INHIBITOR RESPONSE 1 (TIR1)/AUXIN-SIGNALING F-BOXs (AFBs)-dependent nuclear auxin signaling pathway and emerging posttranslational m...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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