Actin-depolymerizing factors 8 and 11 promote root hair elongation at high pH.
ADF
Rab GTPase
actin
pH
root hair
vesicle
Journal
Plant communications
ISSN: 2590-3462
Titre abrégé: Plant Commun
Pays: China
ID NLM: 101769147
Informations de publication
Date de publication:
11 Mar 2024
11 Mar 2024
Historique:
received:
10
12
2023
revised:
26
12
2023
accepted:
26
12
2023
medline:
14
3
2024
pubmed:
2
1
2024
entrez:
30
12
2023
Statut:
ppublish
Résumé
A root hair is a polarly elongated single-celled structure that derives from a root epidermal cell and functions in uptake of water and nutrients from the surrounding environment. Previous reports have demonstrated that short periods of high pH inhibit root hair extension; but the effects of long-term high-pH treatment on root hair growth are still unclear. Here, we report that the duration of root hair elongation is significantly prolonged with increasing external pH, which counteracts the effect of decreasing root hair elongation rate and ultimately produces longer root hairs, whereas loss of actin-depolymerizing factor 8 and 11 (ADF8/11) function causes shortening of root hair length at high pH (pH 7.4). Accumulation of ADF8/11 at the tips of root hairs is inhibited by high pH, and increasing environmental pH affects the actin filament (F-actin) meshwork at the root hair tip. At high pH, the tip-focused F-actin meshwork is absent in root hairs of the adf8/11 mutant, actin filaments are disordered at the adf8/11 root hair tips, and actin turnover is attenuated. Secretory and recycling vesicles do not aggregate in the apical region of adf8/11 root hairs at high pH. Together, our results suggest that, under long-term exposure to high extracellular pH, ADF8/11 may establish and maintain the tip-focused F-actin meshwork to regulate polar trafficking of secretory/recycling vesicles at the root hair tips, thereby promoting root hair elongation.
Identifiants
pubmed: 38158655
pii: S2590-3462(23)00345-0
doi: 10.1016/j.xplc.2023.100787
pmc: PMC10943588
pii:
doi:
Substances chimiques
Actins
0
Actin Depolymerizing Factors
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
100787Informations de copyright
Copyright © 2023 The Author(s). Published by Elsevier Inc. All rights reserved.
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