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Oliet, Juan A.; Planelles, R.; Arias, M. López; Artero, F.

doi:10.1023/a:1015668815037

Cited by 27 publications

(15 citation statements)

References 31 publications

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“…In our study and in accordance with our first hypothesis, seedlings collected from afforested populations exhibited generally lower growth in comparison to natural ones. In contradiction to this result, planted seedlings of Pinus halepensis outperformed naturally regenerated ones at different growth parameters (Oliet et al 2002). Several aspects may explain our main result.…”

Section: Performance Differences Between Natural and Afforested Populcontrasting

confidence: 87%

Performance of seedlings from natural and afforested populations ofCupressus sempervirensunder different temperature and moisture regimes

Al-Hawija

Lachmuth

Welk

et al. 2014

Plant Species Biology

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For successful afforestation programs seed quality is crucial, but seedlings are susceptible to climatic stress. Therefore, to improve afforestation success it is necessary to compare performance of seedlings from natural and cultivated populations under different climatic conditions. We investigated growth performance in seedlings of three natural and four afforested Syrian Cupressus sempervirens L. populations under different temperature and moisture regimes. A "warm" climate chamber approximately simulated current mean annual temperatures (day/night: 20/10°C) while a "hot" chamber simulated an average increase of 5°C (day/night: 25/15°C). Seedlings were irrigated twice (drier) or thrice (moist) weekly. Seedlings from natural provenances outperformed those from afforested stands in all growth variables in both chambers. In the warm chamber, root length and biomass were not affected by irrigation for both population types, but shoot height decreased for afforested seedlings under drier treatment while it slightly increased in natural seedlings. In the hot chamber, shoot height decreased but root length and biomass increased for population types under the drier treatment. Comparison between the two chambers showed that under the drier treatment shoot height and biomass decreased at higher temperatures, but root length and biomass were not significantly different. The same response to higher temperatures was observed under the moist treatment, but root biomass decreased too. Our results emphasize the necessity to protect the remaining natural forest of C. sempervirens in Syria and recommend systematic collection of seed material from natural stands for afforestation programs. This might also hold for ex situ cultivation of retrieving rare and endangered plant species.

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Section: Performance Differences Between Natural and Afforested Populcontrasting

confidence: 87%

Performance of seedlings from natural and afforested populations ofCupressus sempervirensunder different temperature and moisture regimes

Al-Hawija

Lachmuth

Welk

et al. 2014

Plant Species Biology

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“…4). Oliet et al (1999) reported strong correlations between the doses of controlled-release fertilizer applied to seedlings in a P. halepensis nursery and shoot concentrations of N, P and, more weakly, K. In the present work, the fertilizer used (16 + 11 + 10) appears to have more balanced proportions of N, P and K than those used by Oliet et al (1999); thus, significant increases in the N, P and K concentrations compared to the control were obtained using a relatively low dose of 2 g per L. Rincón et al (2008) reported that P. halepensis seedlings inoculated with the P. fluorescens strain Aur6 showed increased P and K concentrations following inoculation in (Dominguez et al 2012). Using the same strain, very similar results were obtained in this study only for the shoot tissue; additionally, we observed a significant decrease in shoot Ca and Mg concentrations, which is in agreement with our previous report.…”

Section: Discussionmentioning

confidence: 99%

Controlled-release fertilizers combined with Pseudomonas fluorescens rhizobacteria inoculum improve growth in Pinus halepensis seedlings

Núñez¹,

Delgado-Alvez²,

Berrocal-Lobo³

et al. 2015

iForest

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© iForest -Biogeosciences and Forestry IntroductionPinus halepensis is one of the most common tree species in the Mediterranean and is also frequently used for reforestation purposes (Maestre & Cortina 2004). Several studies have been carried out with the aim of improving the quality of P. halepensis seedlings obtained from nurseries (Caravaca et al. 2005). The application of chemical fertilizer treatments to forest seedlings in nurseries is the most common cultivation practice. However, it has been established that soil amendments, including ectomycorrhizal fungi and plant growth-promoting rhizobacteria (PGPR), increase plant survival and seedling quality, especially in soils with low microbial activity (Chanway 1997, Probanza et al. 2001.Pseudomonas fluorescens has several characteristics of an effective PGPR and may function as a plant growth stimulator that efficiently promotes seed germination, accelerates growth in the early stages, induces root initiation, enhances the formation of roots and root hairs, facilitates root regeneration and helps to control pathogens in certain forest species. P. fluorescens is easily cultivated in vitro and colonizes a wide range of ecological niches, including the rhizospheres of plants (Bolton et al. 1993); additionally, P. fluorescens genomes are highly diverse (Silby et al. 2009), which likely increases the survival capacity of this microorganism. P. fluorescens improves plant growth by producing phytohormones, such as auxins (IAA), gibberellins and cytokinins, as well as specific amino acids. Furthermore, these bacteria have a high capacity for phosphorus solubilization and are able to produce siderophores (Matthijs et al. 2007).Despite the well-known positive effects of P. fluorescens on plant survival (Silby et al. 2009), only a small number of studies have examined its influence on the growth of forest species (Ouahmane et al. 2009, LucasGarcía et al. 2004). Some of these effects have been observed specifically in P. halepensis inoculated with P. fluorescens Aur6 (Rincón et al. 2008). Recently, we showed that inoculation of Aleppo pine with P. fluorescens CECT 844 improved both its vegetative growth and N uptake (Dominguez et al. 2012).It has been demonstrated that the frequent use of chemical fertilizers in nurseries leads to soil contamination, as chemical fertilizers are not completely assimilated by the seedlings. Furthermore, the industrial practices necessary for the chemical synthesis of compounds containing inorganic nitrogen require the use of contaminating petroleum products, high temperatures and high pressures. Considering these issues, the use of natural, "environmentally friendly" microbial inoculums, such as PGPR rhizobacteria or mycorrhizal fungi, as alternative fertilizers can be considered as a potential future solution. These microorganisms are also beneficial for the maintenance of pre-existing soil microflora, contributing to the conservation of biodiversity. The amended soil eventually enhances the vegetative vigor and the morphophysiological at...

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“…However, several evidences support that there is a gradient in stomatal behaviour in response to water stress among the studied species. First, these species show differences in the regulation of plant water potential, which is associated with stomatal control (Klein, 2014;Sperry, Hacke, Oren, & Comstock, 2002;Tardieu & Simonneau, 1998), with P. halepensis reaching the lowest water potentials, followed by P. nigra, P. sylvestris, and P. uncinata (Choat et al, 2012;Mat ıas, Castro, Villar-Salvador, Quero, & Jump, 2017;Oliet, Planelles, L opez Arias, & Artero, 2002). Second, leaf-level measurements suggest the existence of large interspecific differences in stomatal sensitivity to low plant water potentials, with P. halepensis showing the lowest water potentials at stomatal closure, followed by P. nigra and P. sylvestris (Martin-StPaul, Delzon, & Cochard, 2017).…”

Section: Species and Plant Materialsmentioning

confidence: 99%

The “isohydric trap”: A proposed feedback between water shortage, stomatal regulation, and nutrient acquisition drives differential growth and survival of European pines under climatic dryness

Salazar‐Tortosa

Castro

Villar-Salvador

et al. 2018

Global Change Biology

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Climatic dryness imposes limitations on vascular plant growth by reducing stomatal conductance, thereby decreasing CO uptake and transpiration. Given that transpiration-driven water flow is required for nutrient uptake, climatic stress-induced nutrient deficit could be a key mechanism for decreased plant performance under prolonged drought. We propose the existence of an "isohydric trap," a dryness-induced detrimental feedback leading to nutrient deficit and stoichiometry imbalance in strict isohydric species. We tested this framework in a common garden experiment with 840 individuals of four ecologically contrasting European pines (Pinus halepensis, P. nigra, P. sylvestris, and P. uncinata) at a site with high temperature and low soil water availability. We measured growth, survival, photochemical efficiency, stem water potentials, leaf isotopic composition (δ C, δ O), and nutrient concentrations (C, N, P, K, Zn, Cu). After 2 years, the Mediterranean species Pinus halepensis showed lower δ O and higher δ C values than the other species, indicating higher time-integrated transpiration and water-use efficiency (WUE), along with lower predawn and midday water potentials, higher photochemical efficiency, higher leaf P, and K concentrations, more balanced N:P and N:K ratios, and much greater dry-biomass (up to 63-fold) and survival (100%). Conversely, the more mesic mountain pine species showed higher leaf δ O and lower δ C, indicating lower transpiration and WUE, higher water potentials, severe P and K deficiencies and N:P and N:K imbalances, and poorer photochemical efficiency, growth, and survival. These results support our hypothesis that vascular plant species with tight stomatal regulation of transpiration can become trapped in a feedback cycle of nutrient deficit and imbalance that exacerbates the detrimental impacts of climatic dryness on performance. This overlooked feedback mechanism may hamper the ability of isohydric species to respond to ongoing global change, by aggravating the interactive impacts of stoichiometric imbalance and water stress caused by anthropogenic N deposition and hotter droughts, respectively.

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Untitled

Cited by 27 publications

References 31 publications

Performance of seedlings from natural and afforested populations ofCupressus sempervirensunder different temperature and moisture regimes

Performance of seedlings from natural and afforested populations ofCupressus sempervirensunder different temperature and moisture regimes

Controlled-release fertilizers combined with Pseudomonas fluorescens rhizobacteria inoculum improve growth in Pinus halepensis seedlings

The “isohydric trap”: A proposed feedback between water shortage, stomatal regulation, and nutrient acquisition drives differential growth and survival of European pines under climatic dryness

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