Jewaria, Pawan
- Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences
- Beijing Forestry University
- National Institute of Plant Genome Research
Abstract
Defects in cell wall integrity (CWI) profoundly affect plant growth, although, underlying mechanisms are not well understood. We show that in Arabidopsis mur1 mutant, CWI defects from compromising dimerization of RG-II pectin, a key component of cell wall, attenuate the expression of auxin response factors ARF7-ARF19. As a result, polar auxin transport components are misexpressed, disrupting auxin response asymmetry, leading to defective apical hook development. Accordingly, mur1 hook defects are suppressed by enhancing ARF7 expression. In addition, expression of brassinosteroid biosynthesis genes is down-regulated in mur1 mutant, and supplementing brassinosteroid or enhancing brassinosteroid signaling suppresses mur1 hook defects. Intriguingly, brassinosteroid enhances RG-II dimerization, showing hormonal feedback to the cell wall. Our results thus reveal a previously unrecognized link between cell wall defects from reduced RG-II dimerization and growth regulation mediated via modulation of auxin-brassinosteroid pathways in early seedling development.
Published in
Science Advances
2025, volume: 11, number: 7, article number: eads0760
Publisher: AMER ASSOC ADVANCEMENT SCIENCE
SLU Authors
Aryal, Bibek
- Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences
- Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences
Bhalerao, Rishikesh P.
- Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences
- Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences
UKÄ Subject classification
Cell Biology
Plant Biotechnology
Publication identifier
- DOI: https://doi.org/10.1126/sciadv.ads0760
Permanent link to this page (URI)
https://res.slu.se/id/publ/142511