Root hydraulic conductance, gas exchange and leaf water potential in seedlings of Pistacia lentiscus L. and Quercus suber L. grown under different fertilization and light regimes

Hernández, Encarni I.; Vilagrosa, Alberto; Luis, Vanessa C.; Llorca, M.; Chirino, Esteban; Vallejo, V. Ramón

doi:10.1016/j.envexpbot.2009.07.004

Cited by 51 publications

(37 citation statements)

References 63 publications

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“…2; Table 3). Species with greater K As displayed greater leaf gas exchange values consistent with previously reported correlations (Bond and Kavanagh 1999;Sperry et al 2002;Hernández et al 2009). High photosynthetic rates and the correspondingly high stomatal conductance must be supported by high hydraulic conductance (Mencuccini and Comstock 1999;Hubbard et al 2001;Sellin and Kupper 2007).…”

Section: Morphological Traits Among Speciessupporting

confidence: 80%

Morphological traits and water use strategies in seedlings of Mediterranean coexisting species

et al. 2009

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The distribution of plants is associated with their different patterns of response to their environment. Mediterranean plants have evolved a number of morphological and physiological adaptations that determine their ability to survive and grow, being an effective water uptake and use important factors for drought resistance. In this article, we evaluated interspecific differences in morphology, biomass allocation, and architectural traits and their relationship with water use strategies in seedlings of seven co-occurring Mediterranean species (Anthyllis cytisoides L., Genista scorpius L. DC., Myrtus communis L., Pistacia lentiscus L., Rosmarinus officinalis L., Spartium junceum L. and Ulex parviflorus Pourr.). The results showed that morphological root features vary among species and they are significantly correlated with root hydraulic conductance and leaf gas exchange variables. Species with high specific root length (SRL) showed a low hydraulic conductance per root length (K RRL ) but high specific hydraulic conductance (K As ). M. communis and P. lentiscus showed the most contrasting water use patterns with respect to the other species studied. The results are not affected when considering phylogenetic relatedness. Thus, the variability observed in root hydraulic properties and leaf gas exchange suggests important mechanisms for understanding species coexistence in water-limited ecosystems.

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Section: Morphological Traits Among Speciessupporting

confidence: 80%

Morphological traits and water use strategies in seedlings of Mediterranean coexisting species

et al. 2009

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“…In fact, in the current study, an adequate biomass balance for severe drought conditions might have been achieved without any influence of fertilization. Similar responses were also reported for Mediterranean species when they were fertilized with low doses of CRF (Osmocote ® , N:P:K 14:8:14) under controlled conditions (Hernández et al 2009). …”

Section: Morphological Responses Of Seedlingssupporting

confidence: 57%

“…This greater drought resistance might have been associated with the higher stem diameter, higher root dry mass, and lower shoot:root ratio of these seedlings compared with those subject to other treatments. It has been suggested that this phenotype is favored in environments with severe summer drought (Hernández et al 2009, Cortina et al 2013. Our findings differed to those of other studies that reported a positive relation between nutrient availability and drought resistance (Cuesta et al 2010, Villar-Salvador et al 2012, with the exception of SDM, which had high values in the high dose treatment (12F) attributed to high leaf N and P nutrient load at the end of the drought period.…”

Section: Morphological Responses Of Seedlingscontrasting

confidence: 57%

“…By contrast, high seedling N loading in the nursery produced a morphological imbalance by increasing shoot biomass over root biomass following planting (Trubat et al 2008, Cortina et al 2013. Under dry conditions, this morphological imbalance increases transpiration rates and reduces stem water potential, root hydraulic conductivity (Hernández et al 2009), and stomatal conductance (Jacobs et al 2004). Low shoot:root ratios could promote a more conservative water use and improve the likelihood of survival after outplanting (Leiva & Fernández-Alés 1998, Lloret et al 1999.…”

Section: Introductionmentioning

confidence: 99%

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Linking nursery nutritional status and water availability post-planting under intense summer drought: the case of a South American Mediterranean tree species

Ovalle¹,

Arellano²,

Oliet³

et al. 2016

iForest

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(1-2) Drought-avoidance traits of South American Mediterranean tree species are crucial attributes to be considered in nursery practices aimed at improving the performance of seedlings exposed to intense summer drought in dryland reforestation projects. In this study, we determined the relation between nursery fertilization doses and the development of drought-avoidance traits of the soapbark tree Quillaja saponaria (Mol.) under contrasting watering regimes following post-planting. Seedlings were grown for 6 months using four increasing doses of controlled-release fertilizer (0, 3, 6, and 12 g L -1 of Basacote ® Plus 15:8:12). After outplanting, half of the seedlings were watered weekly and the other half were left unwatered for one growing season from September 2011 to May 2012. Seedlings were periodically measured for morphological and ecophysiological parameters, and carefully harvested for root measurements at the end of the study. Our results showed that high fertilization doses produced significantly larger seedlings in the nursery with high nitrogen and phosphorous foliar concentrations, which resulted in a significantly higher shoot dry mass after outplanting. Unfertilized seedlings grown with water application had a significantly higher stem diameter, root dry mass and lower shoot/root compared with seedlings with high fertilizer dose. These results highlight the ability of this species to maintain drought-avoidance traits, such as high xylem water potential and chlorophyll fluorescence, during the first 3 months of the 7-month drought period. High nutrient loading, although resulting in improved shoot productivity after outplanting, did not make a significant contribution to the early development of drought-avoidance traits in Q. saponaria.

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“…Moderate experimental drought increased the concentrations of polyphenolic compounds with antioxidant function in the leaves of Q. ilex trees (Rivas-Ubach et al, 2014). Polyphenols are synthesized in large quantities during water stress, high temperatures or exposure to solar radiation, which are conditions that characterize the Mediterranean summer (Hernandez et al, 2009). Sometimes, the quantities were higher in watered plants like in loblolly pine needles (Booker and Maier, 2001).…”

Section: Discussionmentioning

confidence: 99%

Growth, ectomycorrhization and biochemical parameters of Quercus suber L. seedlings under drought conditions

Daoudi¹,

Derridj²,

Hannachi³

et al. 2016

Afr. J. Biotechnol.

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Drought conditions are the major constraint to the early establishment of Quercus suber species. However, drought responses of this species depend on provenances. The objective of this study was to obtain more comprehensive knowledge on the influence of drought conditions on the response of Q. suber L. seedlings originating from Algeria. Soil water status in soil (SWC) and relative water content (RWC) in leaves, morphological parameters for growth evaluation and physiological parameters, and ectomycorrhization were evaluated in two plots of seedlings: watered (W) and none watered (NW). Ten weeks of water starvation induced a reduction in RWC, ectomycorrhization rate and height and diameter growth of none watered seedlings. Under drought conditions, both soluble sugars and proteins were enhanced while polyphenols and %N decreased. The reduction of soil water content was negatively correlated with carbon isotope discrimination. The survival of the seedlings under these drought conditions was due to two strategies: osmotic adjustment through soluble sugars and proteins accumulations in leaves and an increase in carbon discrimination which enhances the water use efficiency (WUE).

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Root hydraulic conductance, gas exchange and leaf water potential in seedlings of Pistacia lentiscus L. and Quercus suber L. grown under different fertilization and light regimes

Cited by 51 publications

References 63 publications

Morphological traits and water use strategies in seedlings of Mediterranean coexisting species

Morphological traits and water use strategies in seedlings of Mediterranean coexisting species

Linking nursery nutritional status and water availability post-planting under intense summer drought: the case of a South American Mediterranean tree species

Growth, ectomycorrhization and biochemical parameters of Quercus suber L. seedlings under drought conditions

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