Brassinosteroid homeostasis is critical for the functionality of the Medicago truncatula pulvinus.
Journal
Plant physiology
ISSN: 1532-2548
Titre abrégé: Plant Physiol
Pays: United States
ID NLM: 0401224
Informations de publication
Date de publication:
23 04 2021
23 04 2021
Historique:
received:
29
05
2020
accepted:
09
12
2020
pubmed:
2
4
2021
medline:
1
9
2021
entrez:
1
4
2021
Statut:
ppublish
Résumé
Many plant species open their leaves during the daytime and close them at night as if sleeping. This leaf movement is known as nyctinasty, a unique and intriguing phenomenon that been of great interest to scientists for centuries. Nyctinastic leaf movement occurs widely in leguminous plants, and is generated by a specialized motor organ, the pulvinus. Although a key determinant of pulvinus development, PETIOLULE-LIKE PULVINUS (PLP), has been identified, the molecular genetic basis for pulvinus function is largely unknown. Here, through an analysis of knockout mutants in barrelclover (Medicago truncatula), we showed that neither altering brassinosteroid (BR) content nor blocking BR signal perception affected pulvinus determination. However, BR homeostasis did influence nyctinastic leaf movement. BR activity in the pulvinus is regulated by a BR-inactivating gene PHYB ACTIVATION TAGGED SUPPRESSOR1 (BAS1), which is directly activated by PLP. A comparative analysis between M. truncatula and the non-pulvinus forming species Arabidopsis and tomato (Solanum lycopersicum) revealed that PLP may act as a factor that associates with unknown regulators in pulvinus determination in M. truncatula. Apart from exposing the involvement of BR in the functionality of the pulvinus, these results have provided insights into whether gene functions among species are general or specialized.
Identifiants
pubmed: 33793936
pii: 6119654
doi: 10.1093/plphys/kiab008
pmc: PMC8133549
doi:
Substances chimiques
Brassinosteroids
0
Types de publication
Comparative Study
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Langues
eng
Sous-ensembles de citation
IM
Pagination
1745-1763Informations de copyright
© American Society of Plant Biologists 2021. All rights reserved. For permissions, please email: journals.permissions@oup.com.
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