HUB1 positively regulates salt tolerance in Arabidopsis through dynamic H2B monoubiquitination.
Ji C, Yang X, Si J, Chen C, He S
Salt Tolerance
Salt-crusted soil is quietly spreading at the edges of over-irrigated gardens and coastal landscapes — this discovery of a molecular on-switch for salt resilience opens a path to crop and garden varieties that could reclaim ground most growers have written off.
Scientists found a protein that acts like a master switch, helping plants flip on their salt-survival genes exactly when they need them. In a small test plant called thale cress, removing this protein made it struggle badly in salty conditions — its cells filled with harmful molecules, its mineral balance collapsed, and growth stalled. Turning the switch up made the plant noticeably tougher against salt stress.
Key Findings
Plants lacking HUB1 showed severe salt sensitivity: excessive harmful reactive oxygen species, disrupted sodium-to-potassium balance, reduced protective compounds, and stunted growth under saline conditions
Overexpressing HUB1 enhanced salt tolerance, confirming it as a positive regulator — not just a participant — in the plant stress response
Salt stress triggers a global redistribution of a histone chemical mark (H2Bub1) across the genome, and higher concentrations of this mark within gene bodies directly and positively correlate with stronger activation of salt-response genes
chevron_right Technical Summary
A protein called HUB1 helps plants survive salty soil by chemically tagging histones — the protein spools that DNA wraps around — switching on stress-response genes at the right moment. Boosting HUB1 activity increases salt tolerance; losing it leaves plants unable to handle salinity, revealing a key epigenetic switch for stress adaptation.
Abstract Preview
HUB1 positively regulates salt tolerance in Arabidopsis by modulating H2Bub1 dynamic within the gene bodies of salt-responsive genes, thereby regulating their transcription reprogramming Soil salin...
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Arabidopsis thaliana, the thale cress, mouse-ear cress or arabidopsis, is a small plant from the mustard family (Brassicaceae), native to Eurasia and Africa. Commonly found along the shoulders of roads and in disturbed land, it is generally considered a weed.