Combined Drought and Heat Activates Protective Responses in Eucalyptus globulus That Are Not Activated When Subjected to Drought or Heat Stress Alone
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Altres documents de l'autoria: Correia, Barbara; Hancock, Robert D.; Amaral, Joana; Gomez-Cadenas, Aurelio; Valledor, Luis; Pinto, Glória
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Combined Drought and Heat Activates Protective Responses in Eucalyptus globulus That Are Not Activated When Subjected to Drought or Heat Stress AloneAutoria
Data de publicació
2018-06Editor
Frontiers MediaCita bibliogràfica
CORREIA, Barbara; HANCOCK, Robert D.; AMARAL, Joana; GÓMEZ CADENAS, Aurelio; VALLEDOR, Luis; PINTO, Glória (2018). Combined Drought and Heat Activates Protective Responses in Eucalyptus globulus That Are Not Activated When Subjected to Drought or Heat Stress Alone. Frontiers in Plant Science, v. 9Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
https://www.frontiersin.org/articles/10.3389/fpls.2018.00819/fullVersió
info:eu-repo/semantics/publishedVersionParaules clau / Matèries
Resum
Aiming to mimic a more realistic field condition and to determine convergent and
divergent responses of individual stresses in relation to their combination, we explored
physiological, biochemical, and ... [+]
Aiming to mimic a more realistic field condition and to determine convergent and
divergent responses of individual stresses in relation to their combination, we explored
physiological, biochemical, and metabolomic alterations after drought and heat stress
imposition (alone and combined) and recovery, using a drought-tolerant
Eucalyptus
globulus
clone. When plants were exposed to drought alone, the main responses
included reduced pre-dawn water potential (
9
pd
) and gas exchange. This was
accompanied by increases in malondialdehyde (MDA) and total glutathione, indicative of
oxidative stress. Abscisic acid (ABA) levels increased while the content of jasmonic acid
(JA) fell. Metabolic alterations included reductions in the levels of sugar phosphates
accompanied by increases in starch and non-structural carbohydrates. Levels of
α
-glycerophosphate and shikimate were also reduced while free amino acids increased.
On the other hand, heat alone triggered an increase in relative water content (RWC)
and
9
pd
. Photosynthetic rate and pigments were reduced accompanied by a reduction
in water use efficiency. Heat-induced a reduction of salicylic acid (SA) and JA content.
Sugar alcohols and several amino acids were enhanced by the heat treatment while
starch, fructose-6-phosphate, glucose-6-phosphate, and
α
-glycerophosphate were
reduced. Contrary to what was observed under drought, heat stress activated the
shikimic acid pathway. Drought-stressed plants subject to a heat shock exhibited a
sharp decrease in gas exchange,
9
pd
and JA, no alterations in electrolyte leakage, MDA,
starch, and pigments and increased glutathione pool in relation to control. Comparing
this with drought stress alone, subjecting drought stressed plants to an additional heat
stress alleviated
9
pd
and MDA, maintained an increased glutathione pool and reduced
starch content and non-structural carbohydrates. A novel response triggered by the
combined stress was the accumulation of cinnamate. Regarding recovery, most of
the parameters affected by each stress condition reversed after re-establishment of
control growing conditions. These results highlight that the combination of drought and [-]
Publicat a
Frontiers in Plant Science (2018), v. 9Proyecto de investigación
1) FEDER within the PT2020 Partnership Agreement and Compete 2020 (Programa Operacional Fatores de Competitividade); 2) National Funds through the Portuguese Foundation for Science and Technology (FCT), which financed CESAM (UID/AMB/50017 - POCI-01-0145-FEDER-007638) and the project PTDC/AGR- CFL/112996/2009; 3) FCT also supported the fellowships of BC (SFRH/BD/86448/2012), JA (SFRH/BD/120967/2016), and GP (SFRH/BPD/101669/2014); 4) Ramón y Cajal Program (RYC-2015-17871) (Spanish Ministry of Economy and Competitiveness). Rural and Environmental Science and Analytical Services Division of the Scottish Government.Drets d'accés
info:eu-repo/semantics/openAccess
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