The role of auxin and sugar signaling in dominance inhibition of inflorescence growth by fruit load.
Journal
Plant physiology
ISSN: 1532-2548
Titre abrégé: Plant Physiol
Pays: United States
ID NLM: 0401224
Informations de publication
Date de publication:
03 11 2021
03 11 2021
Historique:
received:
12
02
2021
accepted:
03
05
2021
entrez:
4
11
2021
pubmed:
5
11
2021
medline:
8
3
2022
Statut:
ppublish
Résumé
Dominance inhibition of shoot growth by fruit load is a major factor that regulates shoot architecture and limits yield in agriculture and horticulture crops. In annual plants, the inhibition of inflorescence growth by fruit load occurs at a late stage of inflorescence development termed the end of flowering transition. Physiological studies show this transition is mediated by production and export of auxin from developing fruits in close proximity to the inflorescence apex. In the meristem, cessation of inflorescence growth is controlled in part by the age-dependent pathway, which regulates the timing of arrest. Here, we show the end of flowering transition is a two-step process in Arabidopsis (Arabidopsis thaliana). The first stage is characterized by a cessation of inflorescence growth, while immature fruit continues to develop. At this stage, dominance inhibition of inflorescence growth by fruit load is associated with a selective dampening of auxin transport in the apical region of the stem. Subsequently, an increase in auxin response in the vascular tissues of the apical stem where developing fruits are attached marks the second stage for the end of flowering transition. Similar to the vegetative and floral transition, the end of flowering transition is associated with a change in sugar signaling and metabolism in the inflorescence apex. Taken together, our results suggest that during the end of flowering transition, dominance inhibition of inflorescence shoot growth by fruit load is mediated by auxin and sugar signaling.
Identifiants
pubmed: 34734274
pii: 6280556
doi: 10.1093/plphys/kiab237
pmc: PMC8566266
doi:
Substances chimiques
Indoleacetic Acids
0
Plant Growth Regulators
0
Sugars
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1189-1201Informations de copyright
© American Society of Plant Biologists 2021. All rights reserved. For permissions, please email: journals.permissions@oup.com.
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