Modulation of Antioxidant Defense System Is Associated with Combined Drought and Heat Stress Tolerance in Citrus
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Other documents of the author: I Zandalinas, Sara; Balfagón Sanmartín, Damián; Arbona, Vicent; Gomez-Cadenas, Aurelio
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Title
Modulation of Antioxidant Defense System Is Associated with Combined Drought and Heat Stress Tolerance in CitrusDate
2017-06Publisher
Frontiers MediaBibliographic citation
I. ZANDALINAS, Sara; BALFAGÓN SANMARTÍN, Damián; ARBONA MENGUAL; Vicent; GÓMEZ CADENAS, Aurelio. Modulation of Antioxidant Defense System Is Associated with Combined Drought and Heat Stress Tolerance in Citrus. Frontiers in Plant Science (2017), v. 8, onlineType
info:eu-repo/semantics/articlePublisher version
https://www.frontiersin.org/articles/10.3389/fpls.2017.00953/fullVersion
info:eu-repo/semantics/publishedVersionSubject
Abstract
Drought and high temperatures are two major abiotic stress factors that often occur
simultaneously in nature, affecting negatively crop performance and yield. Moreover,
these environmental challenges induce oxidative ... [+]
Drought and high temperatures are two major abiotic stress factors that often occur
simultaneously in nature, affecting negatively crop performance and yield. Moreover,
these environmental challenges induce oxidative stress in plants through the production
of reactive oxygen species (ROS). Carrizo citrange and Cleopatra mandarin are two
citrus genotypes with contrasting ability to cope with the combination of drought and
heat stress. In this work, a direct relationship between an increased antioxidant activity
and stress tolerance is reported. According to our results, the ability of Carrizo plants to
efficiently coordinate superoxide dismutase (SOD), ascorbate peroxidase (APX), catalase
(CAT), and glutathione reductase (GR) activities involved in ROS detoxification along
with the maintenance of a favorable GSH/GSSG ratio could be related to their relative
tolerance to this stress combination. On the other hand, the increment of SOD activity
and the inefficient GR activation along with the lack of CAT and APX activities in
Cleopatra plants in response to the combination of drought and heat stress, could
contribute to an increased oxidative stress and the higher sensibility of this citrus
genotype to this stress combination. [-]
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