Role of salicylic acid glucosyltransferase in balancing growth and defence for optimum plant fitness.
benzothiadiazole (BTH)
defence
fitness
growth
immune induction
salicylic acid
salicylic acid glucosyltransferase
Journal
Molecular plant pathology
ISSN: 1364-3703
Titre abrégé: Mol Plant Pathol
Pays: England
ID NLM: 100954969
Informations de publication
Date de publication:
03 2020
03 2020
Historique:
received:
10
10
2019
revised:
09
12
2019
accepted:
09
12
2019
pubmed:
23
1
2020
medline:
12
1
2021
entrez:
23
1
2020
Statut:
ppublish
Résumé
Salicylic acid (SA), an essential secondary messenger for plant defence responses, plays a role in maintaining a balance (trade-off) between plant growth and resistance induction, but the detailed mechanism has not been explored. Because the SA mimic benzothiadiazole (BTH) is a more stable inducer of plant defence than SA after exogenous application, we analysed expression profiles of defence genes after BTH treatment to better understand SA-mediated immune induction. Transcript levels of the salicylic acid glucosyltransferase (SAGT) gene were significantly lower in BTH-treated Nicotiana tabacum (Nt) plants than in SA-treated Nt control plants, suggesting that SAGT may play an important role in SA-related host defence responses. Treatment with BTH followed by SA suppressed SAGT transcription, indicating that the inhibitory effect of BTH is not reversible. In addition, in BTH-treated Nt and Nicotiana benthamiana (Nb) plants, an early high accumulation of SA and SA 2-O-β-d-glucoside was only transient compared to the control. This observation agreed well with the finding that SAGT-overexpressing (OE) Nb lines contained less SA and jasmonic acid (JA) than in the Nb plants. When inoculated with a virus, the OE Nb plants showed more severe symptoms and accumulated higher levels of virus, while resistance increased in SAGT-silenced (IR) Nb plants. In addition, the IR plants restricted bacterial spread to the inoculated leaves. After the BTH treatment, OE Nb plants were slightly larger than the Nb plants. These results together indicate that SAGT has a pivotal role in the balance between plant growth and SA/JA-mediated defence for optimum plant fitness.
Identifiants
pubmed: 31965700
doi: 10.1111/mpp.12906
pmc: PMC7036366
doi:
Substances chimiques
Cyclopentanes
0
Oxylipins
0
Thiadiazoles
0
benzo-1,2,3-thiadiazole
273-77-8
jasmonic acid
6RI5N05OWW
Glucosyltransferases
EC 2.4.1.-
Salicylic Acid
O414PZ4LPZ
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
429-442Informations de copyright
© 2020 The Authors. Molecular Plant Pathology published by British Society for Plant Pathology and John Wiley & Sons Ltd.
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