GH3‐mediated auxin inactivation attenuates multiple stages of lateral root development

Lateral root (LR) positioning and development rely on the dynamic interplay between auxin production, transport but also inactivation. Nonetheless, how the latter affects LR organogenesis remains largely uninvestigated. Here, we systematically analyze the impact of the major auxin inactivation pathw...

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Bibliographic Details
Published in:The New phytologist 2023-12, Vol.240 (5), p.1900-1912
Main Authors: Wang, Qing, De Gernier, Hugues, Duan, Xingliang, Xie, Yuanming, Geelen, Danny, Hayashi, Ken‐ishiro, Xuan, Wei, Geisler, Markus, ten Tusscher, Kirsten, Beeckman, Tom, Vanneste, Steffen
Format: Article
Language:English
Subjects:
Attenuation
Auxins
Cell death
Cell size
Deactivation
Dioxygenase
Genetics
Impact analysis
Inactivation
Meristems
Organogenesis
Oscillations
Plant growth
Primordia
Root development
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Summary:Lateral root (LR) positioning and development rely on the dynamic interplay between auxin production, transport but also inactivation. Nonetheless, how the latter affects LR organogenesis remains largely uninvestigated. Here, we systematically analyze the impact of the major auxin inactivation pathway defined by GRETCHEN HAGEN3‐type (GH3) auxin conjugating enzymes and DIOXYGENASE FOR AUXIN OXIDATION1 (DAO1) in all stages of LR development using reporters, genetics and inhibitors in Arabidopsis thaliana . Our data demonstrate that the gh3 . 1/2/3/4/5/6 hextuple ( gh3hex ) mutants display a higher LR density due to increased LR initiation and faster LR developmental progression, acting epistatically over dao1‐1 . Grafting and local inhibitor applications reveal that root and shoot GH3 activities control LR formation. The faster LR development in gh3hex is associated with GH3 expression domains in and around developing LRs. The increase in LR initiation is associated with accelerated auxin response oscillations coinciding with increases in apical meristem size and LR cap cell death rates. Our research reveals how GH3‐mediated auxin inactivation attenuates LR development. Local GH3 expression in LR primordia attenuates development and emergence, whereas GH3 effects on pre‐initiation stages are indirect, by modulating meristem activities that in turn coordinate root growth with LR spacing.
ISSN:0028-646X
1469-8137
DOI:10.1111/nph.19284