Drought response in Arabidopsis displays synergistic coordination between stems and leaves.
Arabidopsis thaliana
chlorophyll content
drought response
embolism resistance
gene expression
intervessel pit membrane thickness
stem anatomy
stomatal control
Journal
Journal of experimental botany
ISSN: 1460-2431
Titre abrégé: J Exp Bot
Pays: England
ID NLM: 9882906
Informations de publication
Date de publication:
05 02 2023
05 02 2023
Historique:
received:
05
08
2022
accepted:
07
11
2022
pubmed:
10
11
2022
medline:
8
2
2023
entrez:
9
11
2022
Statut:
ppublish
Résumé
The synergy between drought-responsive traits across different organs is crucial in the whole-plant mechanism influencing drought resilience. These organ interactions, however, are poorly understood, limiting our understanding of drought response strategies at the whole-plant level. Therefore, we need more integrative studies, especially on herbaceous species that represent many important food crops but remain underexplored in their drought response. We investigated inflorescence stems and rosette leaves of six Arabidopsis thaliana genotypes with contrasting drought tolerance, and combined anatomical observations with hydraulic measurements and gene expression studies to assess differences in drought response. The soc1ful double mutant was the most drought-tolerant genotype based on its synergistic combination of low stomatal conductance, largest stomatal safety margin, more stable leaf water potential during non-watering, reduced transcript levels of drought stress marker genes, and reduced loss of chlorophyll content in leaves, in combination with stems showing the highest embolism resistance, most pronounced lignification, and thickest intervessel pit membranes. In contrast, the most sensitive Cvi ecotype shows the opposite extreme of the same set of traits. The remaining four genotypes show variations in this drought syndrome. Our results reveal that anatomical, ecophysiological, and molecular adaptations across organs are intertwined, and multiple (differentially combined) strategies can be applied to acquire a certain level of drought tolerance.
Identifiants
pubmed: 36350081
pii: 6814375
doi: 10.1093/jxb/erac446
pmc: PMC9899417
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1004-1021Informations de copyright
© The Author(s) 2022. Published by Oxford University Press on behalf of the Society for Experimental Biology.
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