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Water stress and recovery in the performance of two <i>Eucalyptus globulus</i> clones: physiological and biochemical profiles

Title
Water stress and recovery in the performance of two <i>Eucalyptus globulus</i> clones: physiological and biochemical profiles
Type
Article in International Scientific Journal
Year
2014
Authors
Correia, B
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Pintó Marijuan, M
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Neves, L
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Brossa, R
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Dias, MC
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Costa, A
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Castro, BB
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Araújo, C
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Chaves, MM
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Pinto, G
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Journal
Title: Physiologia PlantarumImported from Authenticus Search for Journal Publications
Vol. 150
Pages: 580-592
ISSN: 0031-9317
Publisher: Wiley-Blackwell
Other information
Authenticus ID: P-009-KH1
Abstract (EN): Eucalyptus plantations are among the most productive forest stands in Portugal and Spain, being mostly used for pulp production and, more recently, as an energy crop. However, the region's Mediterranean climate, with characteristic severe summer drought, negatively affects eucalypt growth and increases mortality. Although the physiological response to water shortage is well characterized for this species, evidence about the plants' recovery ability remains scarce. In order to assess the physiological and biochemical response of Eucalyptus globulus during the recovery phase, two genotypes (AL-18 and AL-10) were submitted to a 3-week water stress period at two different intensities (18 and 25% of field capacity), followed by 1 week of rewatering. Recovery was assessed 1 day and 1 week after rehydration. Drought reduced height, biomass, water potential, NPQ and gas exchange in both genotypes. Contrarily, the levels of pigments, chlorophyll fluorescence parameters (F-v/F-m and phi(PSII)), MDA and ABA increased. During recovery, the physiological and biochemical profile of stressed plants showed a similar trend: they experienced reversion of altered traits (MDA, ABA, E, g(s), pigments), while other parameters did not recover (phi(PSII), NPQ). Furthermore, an overcompensation of CO2 assimilation was achieved 1 week after rehydration, which was accompanied by greater growth and re-establishment of oxidative balance. Both genotypes were tolerant to the tested conditions, although clonal differences were found. AL-10 was more productive and showed a more rapid and dynamic response to rehydration (namely in carotenoid content, phi(PSII) and NPQ) compared to clone AL-18.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 13
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