The histidine phosphotransfer AHP4 plays a negative role in Arabidopsis plant response to drought.
Abscisic Acid
/ metabolism
Anthocyanins
/ metabolism
Antioxidants
/ metabolism
Arabidopsis
/ metabolism
Arabidopsis Proteins
/ metabolism
Cytokinins
/ metabolism
Dehydration
Droughts
Gene Expression Regulation, Plant
Histidine
/ genetics
Plants, Genetically Modified
/ genetics
Reactive Oxygen Species
/ metabolism
Stress, Physiological
/ genetics
Arabidopsis histidine phosphotransfer protein 4
abiotic stress
antioxidants
cuticular wax
cytokinin
oxidative damage
phosphotransfer proteins
photosynthesis
transcriptome analysis
Journal
The Plant journal : for cell and molecular biology
ISSN: 1365-313X
Titre abrégé: Plant J
Pays: England
ID NLM: 9207397
Informations de publication
Date de publication:
09 2022
09 2022
Historique:
revised:
20
07
2022
received:
09
08
2020
accepted:
25
07
2022
pubmed:
27
7
2022
medline:
20
9
2022
entrez:
26
7
2022
Statut:
ppublish
Résumé
Cytokinin plays an important role in plant stress responses via a multistep signaling pathway, involving the histidine phosphotransfer proteins (HPs). In Arabidopsis thaliana, the AHP2, AHP3 and AHP5 proteins are known to affect drought responses; however, the role of AHP4 in drought adaptation remains undetermined. In the present study, using a loss-of-function approach we showed that AHP4 possesses an important role in the response of Arabidopsis to drought. This is evidenced by the higher survival rates of ahp4 than wild-type (WT) plants under drought conditions, which is accompanied by the downregulated AHP4 expression in WT during periods of dehydration. Comparative transcriptome analysis of ahp4 and WT plants revealed AHP4-mediated expression of several dehydration- and/or abscisic acid-responsive genes involved in modulation of various physiological and biochemical processes important for plant drought acclimation. In comparison with WT, ahp4 plants showed increased wax crystal accumulation in stems, thicker cuticles in leaves, greater sensitivity to exogenous abscisic acid at germination, narrow stomatal apertures, heightened leaf temperatures during dehydration, and longer root length under osmotic stress. In addition, ahp4 plants showed greater photosynthetic efficiency, lower levels of reactive oxygen species, reduced electrolyte leakage and lipid peroxidation, and increased anthocyanin contents under drought, when compared with WT. These differences displayed in ahp4 plants are likely due to upregulation of genes that encode enzymes involved in reactive oxygen species scavenging and non-enzymatic antioxidant metabolism. Overall, our findings suggest that AHP4 plays a crucial role in plant drought adaptation.
Substances chimiques
Anthocyanins
0
Antioxidants
0
Arabidopsis Proteins
0
Cytokinins
0
Reactive Oxygen Species
0
Histidine
4QD397987E
Abscisic Acid
72S9A8J5GW
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1732-1752Informations de copyright
© 2022 Society for Experimental Biology and John Wiley & Sons Ltd.
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