期刊
DEVELOPMENT
卷 143, 期 18, 页码 3328-3339出版社
COMPANY BIOLOGISTS LTD
DOI: 10.1242/dev.136465
关键词
Lateral root emergence; Reactive oxygen species; Auxin; Respiratory burst oxidase homologs; Auxin-mediated cell wall remodeling
资金
- Fund for Research Training in Industry and Agriculture (Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture
- FRIA, FRS-FNRS)
- Special Research Fund for a joint doctorate from Universiteit Gent
- Fonds Wetenschappelijk Onderzoek Vlaanderen [G0273.13N]
- EURoot: Enhancing resource Uptake from roots under Stress in Cereal Crops - European Union Seventh Framework Programme [FP7-KBBE-2011-5]
- Interuniversity Attraction Poles Programme
- Belgian Science Policy Office (Federaal Wetenschapsbeleid) [P7/29]
- Federation Wallonie-Bruxelles [11/16-036]
- BBSRC [BB/H020314/1, BB/M001806/1, BB/G023972/1] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BB/G023972/1, BB/J009717/1, BB/H020314/1, BB/M001806/1] Funding Source: researchfish
Lateral root (LR) emergence represents a highly coordinated process in which the plant hormone auxin plays a central role. Reactive oxygen species (ROS) have been proposed to function as important signals during auxin-regulated LR formation; however, their mode of action is poorly understood. Here, we report that Arabidopsis roots exposed to ROS show increased LR numbers due to the activation of LR pre-branch sites and LR primordia (LRP). Strikingly, ROS treatment can also restore LR formation in pCASP1: shy2-2 and aux1 lax3 mutant lines in which auxin-mediated cell wall accommodation and remodeling in cells overlying the sites of LR formation is disrupted. Specifically, ROS are deposited in the apoplast of these cells during LR emergence, following a spatiotemporal pattern that overlaps the combined expression domains of extracellular ROS donors of the RESPIRATORY BURST OXIDASE HOMOLOGS (RBOH). We also show that disrupting (or enhancing) expression of RBOH in LRP and/or overlying root tissues decelerates (or accelerates) the development and emergence of LRs. We conclude that RBOH-mediated ROS production facilitates LR outgrowth by promoting cell wall remodeling of overlying parental tissues.
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