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Free by publisher: Publ. Version/Full Text online available 01/2025
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Condensed tannins as antioxidants that protect poplar against oxidative stress from drought and UV-B.
Plant Cell Environ. 45, 362-377 (2022)
DOI
PMC
Condensed tannins (CTs, proanthocyanidins) are widespread polymeric flavan-3-ols known for their ability to bind proteins. In poplar (Populus spp.), leaf condensed tannins are induced by both biotic and abiotic stresses, suggesting diverse biological functions. Here we demonstrate the ability of CTs to function as physiological antioxidants, preventing oxidative and cellular damage in response to drought and UV-B irradiation. Chlorophyll fluorescence was used to monitor photosystem II performance, and both hydrogen peroxide and malondialdehyde content was assayed as a measure of oxidative damage. Transgenic MYB-overexpressing poplar (Populus tremula x tremuloides) with high CT content showed reduced photosystem damage and lower hydrogen peroxide and malondialdehyde content after drought and UV-B stress. This antioxidant effect of CT was observed using two different poplar MYB CT regulators, in multiple independent lines and different genetic backgrounds. Additionally, low-CT MYB134-RNAi transgenic poplars showed enhanced susceptibility to drought-induced oxidative stress. UV-B radiation had different impacts than drought on chlorophyll fluorescence, but all high-CT poplar lines displayed reduced sensitivity to both stresses. Our data indicate that CTs are significant defenses against oxidative stress. The broad distribution of CTs in forest systems which are exposed to diverse abiotic stresses suggests that these compounds have wider functional roles than previously realized. This article is protected by copyright. All rights reserved.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Abiotic Stress ; Populus ; Flavan-3-ols ; Flavonoids ; Oxidative Stress ; Plant Physiology ; Proanthocyanidins ; Reactive Oxygen Species; Chlorophyll Fluorescence; Active Oxygen; Regulates Proanthocyanidin; Phenolic-compounds; Isoprene Emission; Plants; Leaves; Populus; Flavonoids; Radiation
ISSN (print) / ISBN
0140-7791
e-ISSN
1365-3040
Journal
Plant, Cell and Environment
Quellenangaben
Volume: 45,
Issue: 2,
Pages: 362-377
Publisher
Wiley
Publishing Place
Malden, MA
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Research Unit Environmental Simulation (BIOP-EUS)
Grants
natural sciences and engineering research council of canada