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Flavonoids are involved in salt tolerance through ROS scavenging in the halophyte Atriplex canescens
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Flavonoids are involved in salt tolerance through ROS scavenging in the halophyte Atriplex canescens
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Journal Article
Flavonoids are involved in salt tolerance through ROS scavenging in the halophyte Atriplex canescens
2024
Overview
Key message
The content of flavonoids could increase in A. canescens under saline conditions. Overexpression of AcCHI in transgenic A. thaliana promotes flavonoid biosynthesis, thereby functioning in the tolerance of transgenic plants to salt and osmotic stress by maintaining ROS homeostasis
.
Atriplex canescens
is a halophytic forage shrub with excellent adaptation to saline environment. Our previous study showed that a large number of genes related to the biosynthesis of flavonoids in
A. canescens
were significantly up-regulated by NaCl treatments. However, it remains unclear whether flavonoids are involved in
A. canescens
response to salinity. In this study, we found that the accumulation of flavonoids significantly increased in either the leaves or roots of
A. canescens
seedling under 100 and 300 mM NaCl treatments. Correspondingly,
AcCHS
,
AcCHI
and
AcF3H
, which encode three key enzymes (chalcone synthases (CHS), chalcone isomerase (CHI), and flavanone 3-hydroxylase (F3H), respectively) of flavonoids biosynthesis, were significantly induced in the roots or leaves of
A. canescens
by 100 or 300 mM NaCl. Then, we generated the transgenic
Arabidopsis thaliana
overexpressing
AcCHI
and found that transgenic plants accumulated more flavonoids through enhancing the pathway of flavonoids biosynthesis. Furthermore, overexpression of
AcCHI
conferred salt and osmotic stress tolerance in transgenic
A. thaliana
. Contrasted with wild-type
A. thaliana
, transgenic lines grew better with greater biomass, less H
2
O
2
content as well as lower relative plasma permeability in either salt or osmotic stress conditions. In conclusion, our results indicate that flavonoids play an important role in
A. canescens
response to salt stress through reactive oxygen species (ROS) scavenging and the key enzyme gene
AcCHI
in flavonoids biosynthesis pathway of
A. canescens
has the potential to improve the stress tolerance of forages and crops.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
