TY - JOUR
T1 - Water stress and recovery in the performance of two Eucalyptus globulus clones
T2 - Physiological and biochemical profiles
AU - Correia, Barbara
AU - Pinto Marijuan, Marta
AU - Neves, Lucinda
AU - Brossa, Ricard
AU - Dias, Maria Celeste
AU - Costa, Armando
AU - Castro, Bruno B.
AU - Araújo, Clara
AU - Santos, Conceição
AU - Chaves, Manuela
AU - Pinto, Glória
N1 - WOS:000332553600008
PY - 2014
Y1 - 2014
N2 - 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 (Fv/Fm and φPSII), 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, gs, pigments), while other parameters did not recover (φPSII, 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, φPSII and NPQ) compared to clone AL-18.
AB - 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 (Fv/Fm and φPSII), 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, gs, pigments), while other parameters did not recover (φPSII, 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, φPSII and NPQ) compared to clone AL-18.
UR - http://www.scopus.com/inward/record.url?scp=84895919078&partnerID=8YFLogxK
U2 - 10.1111/ppl.12110
DO - 10.1111/ppl.12110
M3 - Article
C2 - 24117924
AN - SCOPUS:84895919078
VL - 150
SP - 580
EP - 592
JO - Physiologia Plantarum
JF - Physiologia Plantarum
SN - 0031-9317
IS - 4
ER -
