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Pesquisa : B01.650.940.800.575.156.100.666.777 [Categoria DeCS]
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  1 / 4149 MEDLINE  
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[PMID]:29377926
[Au] Autor:Pan P; Zhao F; Ning J; Zhang L; Ouyang X; Zang H
[Ad] Endereço:College of Forestry, Jiangxi Agricultural University, Nanchang, China.
[Ti] Título:Impact of understory vegetation on soil carbon and nitrogen dynamic in aerially seeded Pinus massoniana plantations.
[So] Source:PLoS One;13(1):e0191952, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Understory vegetation plays a vital role in regulating soil carbon (C) and nitrogen (N) characteristics due to differences in plant functional traits. Different understory vegetation types have been reported following aerial seeding. While aerial seeding is common in areas with serious soil erosion, few studies have been conducted to investigate changes in soil C and N cycling as affected by understory vegetation in aerially seeded plantations. Here, we studied soil C and N characteristics under two naturally formed understory vegetation types (Dicranopteris and graminoid) in aerially seeded Pinus massoniana Lamb plantations. Across the two studied understory vegetation types, soil organic C was significantly correlated with all measured soil N variables, including total N, available N, microbial biomass N and water-soluble organic N, while microbial biomass C was correlated with all measured variables except soil organic C. Dicranopteris and graminoid differed in their effects on soil C and N process. Except water-soluble organic C, all the other C and N variables were higher in soils with graminoids. The higher levels of soil organic C, microbial biomass C, total N, available N, microbial biomass N and water-soluble organic N were consistent with the higher litter and root quality (C/N) of graminoid vegetation compared to Dicranopteris. Changes in soil C and N cycles might be impacted by understory vegetation types via differences in litter or root quality.
[Mh] Termos MeSH primário: Carbono/metabolismo
Nitrogênio/metabolismo
Pinus/metabolismo
Plantas/metabolismo
Solo/química
[Mh] Termos MeSH secundário: Biomassa
Carbono/química
Nitrogênio/química
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Soil); 7440-44-0 (Carbon); N762921K75 (Nitrogen)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180130
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0191952


  2 / 4149 MEDLINE  
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[PMID]:29329343
[Au] Autor:Liu Z; Dugan B; Masiello CA; Wahab LM; Gonnermann HM; Nittrouer JA
[Ad] Endereço:Department of Earth, Environmental, and Planetary Sciences, Rice University, Houston, Texas, United States of America.
[Ti] Título:Effect of freeze-thaw cycling on grain size of biochar.
[So] Source:PLoS One;13(1):e0191246, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Biochar may improve soil hydrology by altering soil porosity, density, hydraulic conductivity, and water-holding capacity. These properties are associated with the grain size distributions of both soil and biochar, and therefore may change as biochar weathers. Here we report how freeze-thaw (F-T) cycling impacts the grain size of pine, mesquite, miscanthus, and sewage waste biochars under two drainage conditions: undrained (all biochars) and a gravity-drained experiment (mesquite biochar only). In the undrained experiment plant biochars showed a decrease in median grain size and a change in grain-size distribution consistent with the flaking off of thin layers from the biochar surface. Biochar grain size distribution changed from unimodal to bimodal, with lower peaks and wider distributions. For plant biochars the median grain size decreased by up to 45.8% and the grain aspect ratio increased by up to 22.4% after 20 F-T cycles. F-T cycling did not change the grain size or aspect ratio of sewage waste biochar. We also observed changes in the skeletal density of biochars (maximum increase of 1.3%), envelope density (maximum decrease of 12.2%), and intraporosity (porosity inside particles, maximum increase of 3.2%). In the drained experiment, mesquite biochar exhibited a decrease of median grain size (up to 4.2%) and no change of aspect ratio after 10 F-T cycles. We also document a positive relationship between grain size decrease and initial water content, suggesting that, biochar properties that increase water content, like high intraporosity and pore connectivity large intrapores, and hydrophilicity, combined with undrained conditions and frequent F-T cycles may increase biochar breakdown. The observed changes in biochar particle size and shape can be expected to alter hydrologic properties, and thus may impact both plant growth and the hydrologic cycle.
[Mh] Termos MeSH primário: Carvão Vegetal/química
Solo/química
[Mh] Termos MeSH secundário: Ecossistema
Congelamento
Hidrologia
Tamanho da Partícula
Pinus
Poaceae
Porosidade
Prosopis
Esgotos
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Sewage); 0 (Soil); 0 (biochar); 16291-96-6 (Charcoal)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180226
[Lr] Data última revisão:
180226
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180113
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0191246


  3 / 4149 MEDLINE  
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[PMID]:29324901
[Au] Autor:Li S; Lang X; Liu W; Ou G; Xu H; Su J
[Ad] Endereço:Research Institute of Resource Insects, Chinese Academy of Forestry, Kunming, China.
[Ti] Título:The relationship between species richness and aboveground biomass in a primary Pinus kesiya forest of Yunnan, southwestern China.
[So] Source:PLoS One;13(1):e0191140, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The relationship between biodiversity and biomass is an essential element of the natural ecosystem functioning. Our research aims at assessing the effects of species richness on the aboveground biomass and the ecological driver of this relationship in a primary Pinus kesiya forest. We sampled 112 plots of the primary P. kesiya forests in Yunnan Province. The general linear model and the structural equation model were used to estimate relative effects of multivariate factors among aboveground biomass, species richness and the other explanatory variables, including climate moisture index, soil nutrient regime and stand age. We found a positive linear regression relationship between the species richness and aboveground biomass using ordinary least squares regressions. The species richness and soil nutrient regime had no direct significant effect on aboveground biomass. However, the climate moisture index and stand age had direct effects on aboveground biomass. The climate moisture index could be a better link to mediate the relationship between species richness and aboveground biomass. The species richness affected aboveground biomass which was mediated by the climate moisture index. Stand age had direct and indirect effects on aboveground biomass through the climate moisture index. Our results revealed that climate moisture index had a positive feedback in the relationship between species richness and aboveground biomass, which played an important role in a link between biodiversity maintenance and ecosystem functioning. Meanwhile, climate moisture index not only affected positively on aboveground biomass, but also indirectly through species richness. The information would be helpful in understanding the biodiversity-aboveground biomass relationship of a primary P. kesiya forest and for forest management.
[Mh] Termos MeSH primário: Biomassa
Florestas
Pinus
[Mh] Termos MeSH secundário: China
Clima
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180223
[Lr] Data última revisão:
180223
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180112
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0191140


  4 / 4149 MEDLINE  
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[PMID]:29301048
[Au] Autor:Shepherd WP; Sullivan BT
[Ad] Endereço:USDA Forest Service, Southern Research Station, Pineville, LA.
[Ti] Título:Spatial Displacement of a Lure Component Can Reduce Catches of Two Nontarget Species During Spring Monitoring of Southern Pine Beetle.
[So] Source:J Insect Sci;18(1), 2018 Jan 01.
[Is] ISSN:1536-2442
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Local outbreak risk for the southern pine beetle, Dendroctonus frontalis Zimmermann (Coleoptera: Curculionidae), is forecast with a trapping survey conducted every spring throughout the southeastern United States. Traps baited with pine odors and components of the D. frontalis aggregation pheromone are used to obtain abundance estimates of both this species and its clerid predator Thanasimus dubius (F.) (Coleoptera: Cleridae); these data are entered into a predictive model that estimates outbreak risk. An attractant synergist for D. frontalis, endo-brevicomin, has recently been included in the survey lure, but it can have the unintended effect of attracting nontarget species Hylesinus pruinosus Eichhoff (Coleoptera: Curculionidae: Scolytinae) and Enoclerus nigripes (Say) (Coleoptera: Cleridae) which, due to their sometimes large numbers and general similarity in appearance to the target species, could complicate sorting and counting of trap catches. Analysis of bycatch data from a previously-published, 31-mo trapping study in Mississippi indicated that displacement of the endo-brevicomin releaser 6 m from the trap largely eliminated catches of the nontarget species H. pruinosus and E. nigripes while not reducing catches of the target species D. frontalis and T. dubius. Our analysis demonstrates that interspecific differences in spatial responses to attractive semiochemicals can be used to improve insect trap selectivity. Both nontarget beetle species were captured in highest numbers during late winter/early spring, coinciding with the D. frontalis survey.
[Mh] Termos MeSH primário: Compostos Bicíclicos Heterocíclicos com Pontes/administração & dosagem
Controle de Insetos/métodos
Feromônios/administração & dosagem
Gorgulhos
[Mh] Termos MeSH secundário: Animais
Monoterpenos
Pinus
[Pt] Tipo de publicação:EVALUATION STUDIES; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Bridged Bicyclo Compounds, Heterocyclic); 0 (Monoterpenes); 0 (Pheromones); 9T71ZVB55P (frontalin); JPF3YI7O34 (alpha-pinene); KPU1SW45CD (brevicomin)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180221
[Lr] Data última revisão:
180221
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180105
[St] Status:MEDLINE
[do] DOI:10.1093/jisesa/iex106


  5 / 4149 MEDLINE  
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[PMID]:28931465
[Au] Autor:Volkova PY; Geras'kin SA; Horemans N; Makarenko ES; Saenen E; Duarte GT; Nauts R; Bondarenko VS; Jacobs G; Voorspoels S; Kudin M
[Ad] Endereço:Institute of Radiology and Agroecology, 249030, Obninsk, Russian Federation. Electronic address: volkova.obninsk@gmail.com.
[Ti] Título:Chronic radiation exposure as an ecological factor: Hypermethylation and genetic differentiation in irradiated Scots pine populations.
[So] Source:Environ Pollut;232:105-112, 2018 Jan.
[Is] ISSN:1873-6424
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Genetic and epigenetic changes were investigated in chronically irradiated Scots pine (Pinus sylvestris L.) populations from territories that were heavily contaminated by radionuclides as result of the Chernobyl Nuclear Power Plant accident. In comparison to the reference site, the genetic diversity revealed by electrophoretic mobility of AFLPs was found to be significantly higher at the radioactively contaminated areas. In addition, the genome of pine trees was significantly hypermethylated at 4 of the 7 affected sites.
[Mh] Termos MeSH primário: Acidente Nuclear de Chernobyl
Variação Genética/efeitos da radiação
Pinus sylvestris/efeitos da radiação
Exposição à Radiação/análise
Monitoramento de Radiação
[Mh] Termos MeSH secundário: Metilação de DNA
Pinus
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180209
[Lr] Data última revisão:
180209
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170922
[St] Status:MEDLINE


  6 / 4149 MEDLINE  
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[PMID]:29261780
[Au] Autor:Murata M; Kanetani S; Nara K
[Ad] Endereço:Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba, Japan.
[Ti] Título:Ectomycorrhizal fungal communities in endangered Pinus amamiana forests.
[So] Source:PLoS One;12(12):e0189957, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Interactions between trees and ectomycorrhizal (ECM) fungi are critical for the growth and survival of both partners. However, ECM symbiosis in endangered trees has hardly been explored, complicating conservation efforts. Here, we evaluated resident ECM roots and soil spore banks of ECM fungi from endangered Pinus amamiana forests on Yakushima and Tanegashima Islands, Kagoshima Prefecture, Japan. Soil samples were collected from remaining four forests in the two islands. The resident ECM roots in soil samples were subjected to molecular identification. Soil spore banks of ECM fungi were analyzed via bioassays using a range of host seedlings (P. amamiana, P. parviflora, P. densiflora and Castanopsis sieboldii) for 6-8 months. In all remaining P. amamiana forests, we discovered a new Rhizopogon species (Rhizopogon sp.1), the sequence of which has no match amoung numerous Rhizopogon sequences deposited in the international sequence database. Host identification of the resident ECM roots confirmed that Rhizopogon sp.1 was associated only with P. amamiana. Rhizopogon sp.1 was far more dominant in soil spore banks than in resident ECM roots, and its presence was confirmed in nearly all soil samples examined across the major remaining populations. While Rhizopogon sp.1 did not completely lose compatibility to other pine species, its infection rate in the bioassays was highest in the original host, P. amamiana, the performance of which was improved by the infection. These results indicate that Rhizopogon sp.1 is very likely to have a close ecological relationship with endangered P. amamiana, probably due to a long co-evolutionary period on isolated islands, and to play the key role in seedling establishment after disturbance. We may need to identify and utilize such key ECM fungi to conserve endangered trees practically.
[Mh] Termos MeSH primário: Espécies em Perigo de Extinção
Florestas
Fungos/fisiologia
Micorrizas/fisiologia
Pinus/microbiologia
[Mh] Termos MeSH secundário: Bioensaio
Solo
Especificidade da Espécie
Árvores/microbiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Soil)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180108
[Lr] Data última revisão:
180108
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171221
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0189957


  7 / 4149 MEDLINE  
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[PMID]:29253889
[Au] Autor:Oono R
[Ad] Endereço:Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara, CA, United States of America.
[Ti] Título:A confidence interval analysis of sampling effort, sequencing depth, and taxonomic resolution of fungal community ecology in the era of high-throughput sequencing.
[So] Source:PLoS One;12(12):e0189796, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:High-throughput sequencing technology has helped microbial community ecologists explore ecological and evolutionary patterns at unprecedented scales. The benefits of a large sample size still typically outweigh that of greater sequencing depths per sample for accurate estimations of ecological inferences. However, excluding or not sequencing rare taxa may mislead the answers to the questions 'how and why are communities different?' This study evaluates the confidence intervals of ecological inferences from high-throughput sequencing data of foliar fungal endophytes as case studies through a range of sampling efforts, sequencing depths, and taxonomic resolutions to understand how technical and analytical practices may affect our interpretations. Increasing sampling size reliably decreased confidence intervals across multiple community comparisons. However, the effects of sequencing depths on confidence intervals depended on how rare taxa influenced the dissimilarity estimates among communities and did not significantly decrease confidence intervals for all community comparisons. A comparison of simulated communities under random drift suggests that sequencing depths are important in estimating dissimilarities between microbial communities under neutral selective processes. Confidence interval analyses reveal important biases as well as biological trends in microbial community studies that otherwise may be ignored when communities are only compared for statistically significant differences.
[Mh] Termos MeSH primário: Biota
DNA Fúngico/genética
Fungos/classificação
Sequenciamento de Nucleotídeos em Larga Escala
[Mh] Termos MeSH secundário: Biodiversidade
Intervalos de Confiança
Ecologia
Fungos/genética
Filogenia
Pinus/microbiologia
RNA Ribossômico 16S/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Fungal); 0 (RNA, Ribosomal, 16S)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180108
[Lr] Data última revisão:
180108
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171219
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0189796


  8 / 4149 MEDLINE  
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[PMID]:29216258
[Au] Autor:Klutsch JG; Shamoun SF; Erbilgin N
[Ad] Endereço:Department of Renewable Resources, University of Alberta, Edmonton, AB, Canada.
[Ti] Título:Drought stress leads to systemic induced susceptibility to a nectrotrophic fungus associated with mountain pine beetle in Pinus banksiana seedlings.
[So] Source:PLoS One;12(12):e0189203, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Conifers have complex defense responses to initial attacks by insects and pathogens that can have cascading effects on success of subsequent colonizers. However, drought can affect a plant's ability to respond to biotic agents by potentially altering the resources needed for the energetically costly production of induced defense chemicals. We investigated the impact of reduced water on induced chemical defenses of jack pine (Pinus banksiana) seedlings from initial attack by biotic agents and resistance to subsequent challenge inoculation with a pathogenic fungal associate of mountain pine beetle (Dendroctonus ponderosae), Grosmannia clavigera. Applications of phytohormones (methyl salicylate and methyl jasmonate) and G. clavigera were used for initial induction of defenses. Monoterpene concentrations varied with initial induction from fungal and phytohormone application while watering treatment had no effect. Seedlings treated with G. clavigera and methyl jasmonate had the greatest monoterpene concentrations compared to the control and methyl salicylate-treated seedlings. However, the monoterpene response to the challenge inoculation varied with watering treatments, not with prior induction treatments, with lower monoterpene concentrations in fungal lesions on seedlings in the low to moderate watering treatments compared to normal watering treatment. Furthermore, prior induction from phytohormones resulted in systemic cross-induction of resistance to G. clavigera under normal watering treatment but susceptibility under low watering treatment. Seedlings stressed by low water conditions, which also had lower stomatal conductance than seedlings in the normal watering treatment, likely allocated resources to initial defense response but were left unable to acquire further resources for subsequent responses. Our results demonstrate that drought can affect interactions among tree-infesting organisms through systemic cross-induction of susceptibility.
[Mh] Termos MeSH primário: Ascomicetos/patogenicidade
Coleópteros/microbiologia
Secas
Pinus/fisiologia
Estresse Fisiológico
[Mh] Termos MeSH secundário: Animais
Pinus/microbiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171226
[Lr] Data última revisão:
171226
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171208
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0189203


  9 / 4149 MEDLINE  
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[PMID]:29188682
[Au] Autor:Palik BJ; Montgomery RA; Reich PB; Boyden SB
[Ti] Título:Biomass growth response to spatial pattern of variable­retention harvesting in a northern Minnesota pine ecosystem.
[So] Source:Ecol Appl;24(8):2078-88, 2014.
[Is] ISSN:1051-0761
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Variable-retention harvesting (VRH) is an approach for sustaining complex structure in managed forests. A criticism of VRH is that ecological benefits may come at a cost of reduced growth of regeneration, due to competition with residual trees. However, the spatial pattern of retention, i.e., dispersed or aggregated, in VRH systems can be manipulated to minimize suppression of regeneration, and resource limitation to regeneration might be mitigated by reduction of woody shrubs. Continued growth of the residual cohort will compensate for growth reduction of regeneration, although this may differ with retention pattern. We examined aboveground whole-stand biomass growth of trees in a VRH experiment in Pinus resinosa forest in Minnesota, USA. Treatments included dispersed retention, aggregated retention, and an uncut control, as well as a shrub treatment (reduced density or ambient). We addressed the following hypotheses: (1) biomass growth of a cohort of planted pine seedlings will be highest with aggregated rather than dispersed retention, (2) biomass growth of the planted seedlings will increase with shrub reduction, and (3) biomass growth of the residual overstory will be higher with dispersed rather than aggregated retention. Aboveground biomass growth of the planted pines ranged from 0.4 kg·ha−1·yr−1 in the overstory-control­ambient-shrub treatment to 23 kg·ha−1·yr−1 in the aggregated-retention­shrub-reduction treatment. The difference between the control and the retention treatments was significant (P < 0.0001), but not between dispersed and aggregated retention (P = 0.97). Thus, our first hypothesis was not supported. In all treatments, biomass growth was significantly higher (>100% increase) with shrub reduction (P = 0.001), supporting our second hypothesis. Biomass growth of residual trees ranged from 2404 kg·ha−1·yr−1 in the uncut-control­ambient-shrub treatment to 1043 kg·ha−1·yr−1 in the aggregated-retention­shrub-reduction treatment. Differences were significant between the control and retention treatments (P = 0.003), and marginally higher with dispersed vs. aggregated retention (P = 0.09), lending support to our third hypothesis. Our results suggest that managers have flexibility in application of VRH and can expect similar stand-level biomass growth of planted regeneration regardless of retention pattern, but somewhat higher stand-level biomass growth of retained trees with dispersed retention.
[Mh] Termos MeSH primário: Biomassa
Conservação dos Recursos Naturais/métodos
Agricultura Florestal
Florestas
Pinus/fisiologia
[Mh] Termos MeSH secundário: Demografia
Monitoramento Ambiental
Minnesota
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171221
[Lr] Data última revisão:
171221
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171201
[St] Status:MEDLINE


  10 / 4149 MEDLINE  
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[PMID]:29059316
[Au] Autor:Sánchez-Gómez D; Mancha JA; Cervera MT; Aranda I
[Ad] Endereço:Instituto Regional de Investigación y Desarrollo Agroalimentario y Forestal de Castilla-La Mancha (IRIAF), Centro de Investigación Agroforestal de Albaladejito (CIAF), Carretera Toledo-Cuenca, km 174, 16194, Cuenca, Spain.
[Ti] Título:Inter-genotypic differences in drought tolerance of maritime pine are modified by elevated [CO2].
[So] Source:Ann Bot;120(4):591-602, 2017 Oct 17.
[Is] ISSN:1095-8290
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Background and Aims: Despite the importance of growth [CO 2 ] and water availability for tree growth and survival, little information is available on how the interplay of these two factors can shape intraspecific patterns of functional variation in tree species, particularly for conifers. The main objective of the study was to test whether the range of realized drought tolerance within the species can be affected by elevated [CO 2 ]. Methods: Intraspecific variability in leaf gas exchange, growth rate and other leaf functional traits were studied in clones of maritime pine. A factorial experiment including water availability, growth [CO 2 ] and four different genotypes was conducted in growth rooms. A 'water deficit' treatment was imposed by applying a cycle of progressive soil water depletion and recovery at two levels of growth [CO 2 ]: 'ambient [CO 2 ]' (aCO 2 400 µmol mol -1 ) and 'elevated [CO 2 ]' (eCO 2 800 µmol mol -1 ). Key Results: eCO2 had a neutral effect on the impact of drought on growth and leaf gas exchange of the most drought-sensitive genotypes while it aggravated the impact of drought on the most drought-tolerant genotypes at aCO2. Thus, eCO2 attenuated genotypic differences in drought tolerance as compared with those observed at aCO2. Genotypic variation at both levels of growth [CO2] was found in specific leaf area and leaf nitrogen content but not in other physiological leaf traits such as intrinsic water use efficiency and leaf osmotic potential. eCO2 increased Δ 13 C but had no significant effect on δ 18 O. This effect did not interact with the impact of drought, which increased δ 18 O and decreased Δ 13 C. Nevertheless, correlations between Δ 13 C and δ 18 O indicated the non-stomatal component of water use efficiency in this species can be particularly sensitive to drought. Conclusions: Evidence from this study suggests elevated [CO 2 ] can modify current ranges of drought tolerance within tree species.
[Mh] Termos MeSH primário: Pinus/genética
[Mh] Termos MeSH secundário: Dióxido de Carbono/metabolismo
Clorofila/metabolismo
Desidratação/genética
Desidratação/metabolismo
Desidratação/fisiopatologia
Genótipo
Nitrogênio/análise
Pressão Osmótica
Fotossíntese/fisiologia
Pinus/crescimento & desenvolvimento
Pinus/metabolismo
Pinus/fisiologia
Folhas de Planta/química
Folhas de Planta/crescimento & desenvolvimento
Folhas de Planta/metabolismo
Folhas de Planta/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
1406-65-1 (Chlorophyll); 142M471B3J (Carbon Dioxide); N762921K75 (Nitrogen)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171109
[Lr] Data última revisão:
171109
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171024
[St] Status:MEDLINE
[do] DOI:10.1093/aob/mcx080



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