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Influence of enhanced temperature on photosynthesis, photooxidative damage, and antioxidant strategies in Ceratonia siliqua L. seedlings subjected to water deficit and rewatering

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Influence of enhanced temperature on photosynthesis, photooxidative damage, and antioxidant strategies in Ceratonia siliqua L. seedlings subjected to water deficit and rewatering

Content Provider	Springer Nature Link
Author	Osório, M. L. Osório, J. Vieira, A. C. Gonçalves, S. Roma, A.
Copyright Year	2011
Abstract	Predicted future climatic changes for the Mediterranean region give additional importance to the study of photooxidative stress in local economic species subjected to combined drought and high-temperature conditions. Under this context, the impact of these stresses on photosynthesis, energy partitioning, and membrane lipids, as well as the potential ability to attenuate oxidative damage, were investigated in Ceratonia siliqua L. Two thermal regimes (LT: 25/18°C; HT: 32/21°C) and three soil water conditions (control, water stress, and rewetting) were considered. HT exacerbated the adverse effects of water shortage on photosynthetic rates (P $_{N}$) and PSII function. The decrease in P $_{N}$ was 33% at LT whereas at HT it was 84%. In spite of this, the electron transport rate (ETR) was not affected, which points to an increased allocation of reductants to sinks other than CO$_{2}$ assimilation. Under LT conditions, water stress had no significant effects on yield of PSII photochemistry (Φ$_{PSII}$) and yields of regulated (Φ$_{NPQ}$) and nonregulated (Φ$_{NO}$) energy dissipation. Conversely, drought induced a significant decrease of Φ$_{PSII}$ and a concomitant increase of Φ$_{NO}$ in HT plants, thereby favouring the overproduction of reactive oxygen species (ROS). Moreover, signs of lipid peroxidation damage were detected in HT plants, in which drought caused an increase of 40% in malondialdehyde (MDA) content. Concurrently, a marked increase in proline content was observed, while the activities of catalase (CAT) and ascorbate peroxidase (APX) were unaffected. Despite the generation of a moderate oxidative stress response, C. siliqua revealed a great capability for photosynthetic recovery 36 h after rewatering, which suggests that the species can cope with predicted climate change.
Starting Page	3
Ending Page	12
Page Count	10
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	49
Issue Number	1
e-ISSN	15739058
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-01-28
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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