Tolerance of citrus plants to the combination of high temperatures and drought is associated to the increase in transpiration modulated by a reduction in abscisic acid levels
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Otros documentos de la autoría: I Zandalinas, Sara; Rivero, Rosa M; Martínez, Vicente; Gomez-Cadenas, Aurelio; Arbona, Vicent
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Título
Tolerance of citrus plants to the combination of high temperatures and drought is associated to the increase in transpiration modulated by a reduction in abscisic acid levelsAutoría
Fecha de publicación
2016Editor
BioMed CentralISSN
1471-2229; 1471-2229Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4848825/Palabras clave / Materias
Resumen
Background: In natural environments, several adverse environmental conditions occur simultaneously constituting
a unique stress factor. In this work, physiological parameters and the hormonal regulation of Carrizo ... [+]
Background: In natural environments, several adverse environmental conditions occur simultaneously constituting
a unique stress factor. In this work, physiological parameters and the hormonal regulation of Carrizo citrange and
Cleopatra mandarin, two citrus genotypes, in response to the combined action of high temperatures and water
deprivation were studied. The objective was to characterize particular responses to the stress combination.
Results: Experiments indicated that Carrizo citrange is more tolerant to the stress combination than Cleopatra
mandarin. Furthermore, an experimental design spanning 24 h stress duration, heat stress applied alone induced higher
stomatal conductance and transpiration in both genotypes whereas combined water deprivation partially counteracted
this response. Comparing both genotypes, Carrizo citrange showed higher phostosystem-II efficiency and lower oxidative
damage than Cleopatra mandarin. Hormonal profiling in leaves revealed that salicylic acid (SA) accumulated in response
to individual stresses but to a higher extent in samples subjected to the combination of heat and drought (showing an
additive response). SA accumulation correlated with the up-regulation of pathogenesis-related gene 2 (CsPR2), as a
downstream response. On the contrary, abscisic acid (ABA) accumulation was higher in water-stressed plants followed by
that observed in plants under stress combination. ABA signaling in these plants was confirmed by the expression of
responsive to ABA-related gene 18 (CsRAB18). Modulation of ABA levels was likely carried out by the induction of 9-
neoxanthin cis-epoxicarotenoid dioxygenase (CsNCED) and ABA 8’-hydroxylase (CsCYP707A) while conversion to ABAglycosyl
ester (ABAGE) was a less prominent process despite the strong induction of ABA O-glycosyl transferase (CsAOG).
Conclusions: Cleopatra mandarin is more susceptible to the combination of high temperatures and water deprivation
than Carrizo citrange. This is likely a result of a higher transpiration rate in Carrizo that could allow a more efficient cooling
of leaf surface ensuring optimal CO2 intake. Hence, SA induction in Cleopatra was not sufficient to protect PSII from
photoinhibition, resulting in higher malondialdehyde (MDA) build-up. Inhibition of ABA accumulation during heat stress
and combined stresses was achieved primarily through the up-regulation of CsCYP707A leading to phaseic acid (PA) and
dehydrophaseic acid (DPA) production. To sum up, data indicate that specific physiological responses to the combination
of heat and drought exist in citrus. In addition, these responses are differently modulated depending on the particular
stress tolerance of citrus genotypes. [-]
Publicado en
Zandalinas et al. BMC Plant Biology (2016) 16:105Derechos de acceso
info:eu-repo/semantics/openAccess
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