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Yang Y, Feng W, Bao L, Xian L, Lu J, Wu D, Jacobs DF, Zeng S. Effects of sewage sludge application methods on the transport of heavy metals with runoff and their mechanisms. Sci Total Environ 2024; 912:168909. [PMID: 38029981 DOI: 10.1016/j.scitotenv.2023.168909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 11/16/2023] [Accepted: 11/24/2023] [Indexed: 12/01/2023]
Abstract
Woodland utilization is a promising disposal method for sewage sludge (SS). However, the potential risk of heavy metals (HMs) transport with runoff must be considered. Among the various factors influencing HMs loss, SS application methods (Holing application, HA; Broadcasting and mixing application, BM; Broadcasting application, BA) are likely to cause significant effects by altering soil erosion and soil aggregates. This study aimed to determine how SS application methods affect HMs loss, soil aggregates erosion, and how they are related. Accordingly, the losses of HMs in surface runoff, interflow, and sediment were quantified during six simulated rainfalls. The results demonstrated that all methods reduced surface runoff, but BA was the most effective. Additionally, BA significantly reduced the total sediment yield and the total proportion of the <0.05 mm fraction aggregates. Moreover, BA had the smallest cumulative losses of Pb and Cd through surface runoff and Cu, Pb, and Cd through sediment. Sediment was the most important pathway for HMs loss, through which over 76.56 % of HMs were lost. In BA, the <0.05 mm fraction aggregates had the lowest HMs load, whereas in other treatments had the highest (54.33 %-80.33 %). The potential ecological risk coefficient of Cd was beyond "moderate" in all the pathways of BM and "high" in the interflow of each SS treatment. Nonetheless, when the multi-elements were evaluated collectively, the potential ecological risk index for each SS treatment was categorized as "low". Overall, BA not only reduced soil erosion but also posed no risk of HMs pollution. It should be noted that the loss of Cd in the interflow had a great impact, while the <0.05 mm fraction aggregates played a significant role in the HMs load. Thus, the current study not only provides an effective approach for the environmentally safe disposal of SS but also proposes a scientific method for the application of SS in woodlands.
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Affiliation(s)
- Yuantong Yang
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Weixun Feng
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Li'an Bao
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Lihua Xian
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China.
| | - Jie Lu
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Daoming Wu
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China.
| | - Douglass F Jacobs
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907-2061, USA.
| | - Shucai Zeng
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China.
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2
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Ebrahimi A, Sugiyama A, Ayala-Jacobo L, Jacobs DF. Integrative analysis of physiology and genomics provides insights into freeze tolerance adaptations of Acacia koa along an elevational cline. Physiol Plant 2023; 175:e14098. [PMID: 38148190 DOI: 10.1111/ppl.14098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 10/25/2023] [Accepted: 11/06/2023] [Indexed: 12/28/2023]
Abstract
Natural selection for plant species in heterogeneous environments creates genetic variation for traits such as cold tolerance. While physiological or molecular analyses have been used to evaluate stress tolerance adaptations, combining these approaches may provide deeper insight. Acacia koa (koa) occurs from sea level to 2300 m in Hawai'i, USA. At high elevations, natural koa populations have declined due to deforestation, and freeze tolerance is a limiting factor for tree regeneration. We used physiology and molecular analyses to evaluate cold tolerance of koa populations from low (300-750 m), middle (750-1500 m), and high elevations (1500-2100 m). Half of the seedlings were cold acclimated by exposure to progressively lowered air temperatures for eight weeks (from 25.6/22.2°C to 8/4°C, day/night). Using the whole plant physiology-freezing test and koa C-repeat Binding Factor CBF genes, our results indicated that koa can be cold-acclimated when exposed to low, non-freezing temperatures. Seedlings from high elevations had consistently higher expression of Koa CBF genes associated with cold tolerance, helping to explain variation in cold-hardy phenotypes. Evaluation of the genetic background of 22 koa families across the elevations with low coverage RNA sequencing indicated that high elevation koa had relatively low values of heterozygosity, suggesting that adaptation is more likely to arise in the middle and low elevation sources. This physiology and molecular data for cold tolerance of koa across the elevation gradient of the Hawaiian Islands provides insights into natural selection processes and may help to support guidelines for conservation and seed transfer in forest restoration efforts.
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Affiliation(s)
- Aziz Ebrahimi
- Hardwood Tree Improvement and Regeneration Center, Department of Forestry and Natural Resources, Purdue University, Indiana, USA
| | - Anna Sugiyama
- Hardwood Tree Improvement and Regeneration Center, Department of Forestry and Natural Resources, Purdue University, Indiana, USA
| | - Lilian Ayala-Jacobo
- Hardwood Tree Improvement and Regeneration Center, Department of Forestry and Natural Resources, Purdue University, Indiana, USA
| | - Douglass F Jacobs
- Hardwood Tree Improvement and Regeneration Center, Department of Forestry and Natural Resources, Purdue University, Indiana, USA
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3
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Mariotti B, Martini S, Raddi S, Ugolini F, Oliet JA, Jacobs DF, Maltoni A. Cultivation Using Coir Substrate and P or K Enriched Fertilizer Provides Higher Resistance to Drought in Ecologically Diverse Quercus Species. Plants (Basel) 2023; 12:525. [PMID: 36771610 PMCID: PMC9920752 DOI: 10.3390/plants12030525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 01/11/2023] [Accepted: 01/19/2023] [Indexed: 06/18/2023]
Abstract
Nursery cultivation practices can be modified to increase resistance to water stress in forest seedlings following field establishment, which may be increasingly important under climate change. We evaluated the morphological (survival, growth) and physiological (chlorophyll fluorescence, leaf water potential) responses to water stress for three ecologically diverse Quercus species (Q. robur, Q. pubescens, and Q. ilex) with varying traits resulting from the combination of growing media (peat, coir) and fertilization (standard, P-enriched, K-enriched). For all species under water stress, seedlings grown in coir had generally higher growth than those grown in peat. Seedlings fertilized with P performed better, particularly for survival; conversely, K fertilization resulted in inconsistent findings. Such results could be explained by a combination of factors. P fertilization resulted in higher P accumulation in seedlings, while no K accumulation was observed in K fertilized seedlings. As expected, the more drought-sensitive species, Q. robur, showed the worst response, while Q. pubescens had a drought resistance equal or better to Q. ilex despite being classified as intermediate in drought resistance in Mediterranean environments.
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Affiliation(s)
- Barbara Mariotti
- Dipartimento di Scienze e Tecnologie Agrarie, Alimentari, Ambientali e Forestali—DAGRI, Università di Firenze, Via San Bonaventura 13, 50145 Firenze, Italy
| | - Sofia Martini
- Dipartimento di Scienze e Tecnologie Agrarie, Alimentari, Ambientali e Forestali—DAGRI, Università di Firenze, Via San Bonaventura 13, 50145 Firenze, Italy
| | - Sabrina Raddi
- Dipartimento di Scienze e Tecnologie Agrarie, Alimentari, Ambientali e Forestali—DAGRI, Università di Firenze, Via San Bonaventura 13, 50145 Firenze, Italy
| | - Francesca Ugolini
- Istituto per la Bioeconomia, Consiglio Nazionale delle Ricerche, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Juan A. Oliet
- Departamento de Sistemas y Recursos Naturales, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
| | - Douglass F. Jacobs
- Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center, Purdue University, West Lafayette, IN 47907, USA
| | - Alberto Maltoni
- Dipartimento di Scienze e Tecnologie Agrarie, Alimentari, Ambientali e Forestali—DAGRI, Università di Firenze, Via San Bonaventura 13, 50145 Firenze, Italy
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4
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Wu D, Peng W, Bao L, Yu X, Dong X, Lai M, Liang Z, Xie S, Jacobs DF, Zeng S. Biochar alleviating heavy metals phytotoxicity in sludge-amended soil varies with plant adaptability. Environ Res 2022; 215:114248. [PMID: 36058279 DOI: 10.1016/j.envres.2022.114248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 08/12/2022] [Accepted: 08/29/2022] [Indexed: 06/15/2023]
Abstract
Recycling sewage sludge (SS) to soil potentially causes soil heavy metal (HM) pollution and plant phytotoxicity. Biochar plays an important role in alleviating HM phytotoxicity, and responses vary with the feedstocks and usage of biochar. However, the effect of plant adaptability on biochar-mediated alleviation is poorly understood. Here, SS-derived biochar (SB) and rice straw-derived biochar (RB) applied at rates of 1.5% and 3% (W/W, SB1.5, SB3, RB1.5, and RB3) were used to improve the properties of soil amended with SS at 50% (W/W). Alleviation of phytotoxicity by biochar was further analyzed with SS-sensitive plant Monstera deliciosa and SS-resistant plant Ruellia simplex. Results revealed that both SB and RB significantly decreased the soil's bulk density and increased water retention. They also changed soil organic matter content and HMs fractionation. The addition of SB or RB alleviated the SS phytotoxicity, and they significantly promoted the growth and the root morphology and physiological index of M. deliciosa. But for R. simplex, these significant changes only synchronously occurred in SB3 treatment. The alleviation in M. deliciosa was more prominent and more closely connected with soil property changes than in R. simplex. Also, more soil property predictors were observed to play an important role in M. deliciosa growth than in R. simplex growth. These results indicated that biochar alleviating HMs phytotoxicity in SS-amended soil is associated with the changes of soil property. Moreover, the alleviation varies more prominently with plant adaptability than with biochar feedstocks and usage.
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Affiliation(s)
- Daoming Wu
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
| | - Weixin Peng
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
| | - Li'an Bao
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
| | - Xiaoli Yu
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou, 510006, China
| | - Xiaoquan Dong
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
| | - Mingli Lai
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
| | - Zhiqi Liang
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
| | - Shanyan Xie
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
| | - Douglass F Jacobs
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN, 47907-2061, USA
| | - Shucai Zeng
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China.
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5
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Liang J, Gamarra JGP, Picard N, Zhou M, Pijanowski B, Jacobs DF, Reich PB, Crowther TW, Nabuurs GJ, de-Miguel S, Fang J, Woodall CW, Svenning JC, Jucker T, Bastin JF, Wiser SK, Slik F, Hérault B, Alberti G, Keppel G, Hengeveld GM, Ibisch PL, Silva CA, Ter Steege H, Peri PL, Coomes DA, Searle EB, von Gadow K, Jaroszewicz B, Abbasi AO, Abegg M, Yao YCA, Aguirre-Gutiérrez J, Zambrano AMA, Altman J, Alvarez-Dávila E, Álvarez-González JG, Alves LF, Amani BHK, Amani CA, Ammer C, Ilondea BA, Antón-Fernández C, Avitabile V, Aymard GA, Azihou AF, Baard JA, Baker TR, Balazy R, Bastian ML, Batumike R, Bauters M, Beeckman H, Benu NMH, Bitariho R, Boeckx P, Bogaert J, Bongers F, Bouriaud O, Brancalion PHS, Brandl S, Brearley FQ, Briseno-Reyes J, Broadbent EN, Bruelheide H, Bulte E, Catlin AC, Cazzolla Gatti R, César RG, Chen HYH, Chisholm C, Cienciala E, Colletta GD, Corral-Rivas JJ, Cuchietti A, Cuni-Sanchez A, Dar JA, Dayanandan S, de Haulleville T, Decuyper M, Delabye S, Derroire G, DeVries B, Diisi J, Do TV, Dolezal J, Dourdain A, Durrheim GP, Obiang NLE, Ewango CEN, Eyre TJ, Fayle TM, Feunang LFN, Finér L, Fischer M, Fridman J, Frizzera L, de Gasper AL, Gianelle D, Glick HB, Gonzalez-Elizondo MS, Gorenstein L, Habonayo R, Hardy OJ, Harris DJ, Hector A, Hemp A, Herold M, Hillers A, Hubau W, Ibanez T, Imai N, Imani G, Jagodzinski AM, Janecek S, Johannsen VK, Joly CA, Jumbam B, Kabelong BLPR, Kahsay GA, Karminov V, Kartawinata K, Kassi JN, Kearsley E, Kennard DK, Kepfer-Rojas S, Khan ML, Kigomo JN, Kim HS, Klauberg C, Klomberg Y, Korjus H, Kothandaraman S, Kraxner F, Kumar A, Kuswandi R, Lang M, Lawes MJ, Leite RV, Lentner G, Lewis SL, Libalah MB, Lisingo J, López-Serrano PM, Lu H, Lukina NV, Lykke AM, Maicher V, Maitner BS, Marcon E, Marshall AR, Martin EH, Martynenko O, Mbayu FM, Mbuvi MTE, Meave JA, Merow C, Miscicki S, Moreno VS, Morera A, Mukul SA, Müller JC, Murdjoko A, Nava-Miranda MG, Ndive LE, Neldner VJ, Nevenic RV, Nforbelie LN, Ngoh ML, N'Guessan AE, Ngugi MR, Ngute ASK, Njila ENN, Nyako MC, Ochuodho TO, Oleksyn J, Paquette A, Parfenova EI, Park M, Parren M, Parthasarathy N, Pfautsch S, Phillips OL, Piedade MTF, Piotto D, Pollastrini M, Poorter L, Poulsen JR, Poulsen AD, Pretzsch H, Rodeghiero M, Rolim SG, Rovero F, Rutishauser E, Sagheb-Talebi K, Saikia P, Sainge MN, Salas-Eljatib C, Salis A, Schall P, Schepaschenko D, Scherer-Lorenzen M, Schmid B, Schöngart J, Šebeň V, Sellan G, Selvi F, Serra-Diaz JM, Sheil D, Shvidenko AZ, Sist P, Souza AF, Stereńczak KJ, Sullivan MJP, Sundarapandian S, Svoboda M, Swaine MD, Targhetta N, Tchebakova N, Trethowan LA, Tropek R, Mukendi JT, Umunay PM, Usoltsev VA, Vaglio Laurin G, Valentini R, Valladares F, van der Plas F, Vega-Nieva DJ, Verbeeck H, Viana H, Vibrans AC, Vieira SA, Vleminckx J, Waite CE, Wang HF, Wasingya EK, Wekesa C, Westerlund B, Wittmann F, Wortel V, Zawiła-Niedźwiecki T, Zhang C, Zhao X, Zhu J, Zhu X, Zhu ZX, Zo-Bi IC, Hui C. Co-limitation towards lower latitudes shapes global forest diversity gradients. Nat Ecol Evol 2022; 6:1423-1437. [PMID: 35941205 DOI: 10.1038/s41559-022-01831-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 06/15/2022] [Indexed: 11/09/2022]
Abstract
The latitudinal diversity gradient (LDG) is one of the most recognized global patterns of species richness exhibited across a wide range of taxa. Numerous hypotheses have been proposed in the past two centuries to explain LDG, but rigorous tests of the drivers of LDGs have been limited by a lack of high-quality global species richness data. Here we produce a high-resolution (0.025° × 0.025°) map of local tree species richness using a global forest inventory database with individual tree information and local biophysical characteristics from ~1.3 million sample plots. We then quantify drivers of local tree species richness patterns across latitudes. Generally, annual mean temperature was a dominant predictor of tree species richness, which is most consistent with the metabolic theory of biodiversity (MTB). However, MTB underestimated LDG in the tropics, where high species richness was also moderated by topographic, soil and anthropogenic factors operating at local scales. Given that local landscape variables operate synergistically with bioclimatic factors in shaping the global LDG pattern, we suggest that MTB be extended to account for co-limitation by subordinate drivers.
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Affiliation(s)
- Jingjing Liang
- Forest Advanced Computing and Artificial Intelligence Laboratory (FACAI), Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN, USA.
| | - Javier G P Gamarra
- Forestry Division, Food and Agriculture Organization of the United Nations, Rome, Italy
| | | | - Mo Zhou
- Forest Advanced Computing and Artificial Intelligence Laboratory (FACAI), Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN, USA
| | - Bryan Pijanowski
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN, USA
| | - Douglass F Jacobs
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN, USA
| | - Peter B Reich
- Institute for Global Change Biology, School for Environment and Sustainability, University of Michigan, Ann Arbor, MI, USA
- Department of Forest Resources, University of Minnesota, St. Paul, MN, USA
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, New South Wales, Australia
| | - Thomas W Crowther
- Crowther Lab, Department of Environmental Systems Science, Institute of Integrative Biology, ETH Zürich, Zürich, Switzerland
| | - Gert-Jan Nabuurs
- Wageningen Environmental Research, Wageningen University and Research, Wageningen, Netherlands
- Forest Ecology and Forest Management Group, Wageningen University and Research, Wageningen, Netherlands
| | - Sergio de-Miguel
- Department of Crop and Forest Sciences, University of Lleida, Lleida, Spain
- Joint Research Unit CTFC-Agrotecnio-CERCA, Solsona, Spain
| | - Jingyun Fang
- Institute of Ecology and Key Laboratory for Earth Surface Processes of the Ministry of Education, College of Urban and Evironmental Sciences, Peking University, Beijing, China
| | | | - Jens-Christian Svenning
- Center for Biodiversity Dynamics in a Changing World (BIOCHANGE), Department of Biology, Aarhus University, Aarhus C, Denmark
- Section for Ecoinformatics and Biodiversity, Department of Biology, Aarhus University, Aarhus C, Denmark
| | - Tommaso Jucker
- School of Biological Sciences, University of Bristol, Bristol, UK
| | - Jean-Francois Bastin
- TERRA Teaching and Research Centre, Gembloux Agro Bio-Tech, University of Liege, Gembloux, Belgium
| | - Susan K Wiser
- Manaaki Whenua Landcare Research, Lincoln, New Zealand
| | - Ferry Slik
- Environmental and Life Sciences, Faculty of Science, Universiti Brunei Darussalam, Gadong, Brunei Darussalam
| | - Bruno Hérault
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement, Montpellier, France
- INP-HB (Institut National Polytechnique Félix Houphouet-Boigny), University of Montpellier, Yamoussoukro, Ivory Coast
| | - Giorgio Alberti
- Department of Agricultural, Food, Environmental and Animal Sciences, University of Udine, Udine, Italy
- Faculty of Science and Technology, Free University of Bolzano, Bolzano, Italy
- Institute of Bioeconomy, CNR, Sesto, Italy
| | - Gunnar Keppel
- Natural and Built Environments Research Centre, School of Natural and Built Environments, University of South Australia, Adelaide, South Australia, Australia
| | - Geerten M Hengeveld
- Biometris, Wageningen University and Research, Wageningen, Netherlands
- Wageningen University & Research, Forest and Nature Conservation Policy Group, Wageningen, Netherlands
| | - Pierre L Ibisch
- Centre for Econics and Ecosystem Management, Eberswalde University for Sustainable Development, Eberswalde, Germany
| | - Carlos A Silva
- School of Forest, Fisheries, and Geomatics Sciences, Institute of Food & Agricultural Sciences, University of Florida, Gainesville, FL, USA
| | | | - Pablo L Peri
- Instituto Nacional de Tecnología Agropecuaria (INTA), Santa Cruz, Argentina
| | - David A Coomes
- Department of Plant Sciences, University of Cambridge, Cambridge, UK
| | - Eric B Searle
- Faculty of Natural Resources Management, Lakehead University, Thunder Bay, Ontario, Canada
| | - Klaus von Gadow
- University of Göttingen, Göttingen, Germany
- Beijing Forestry University, Beijing, China
- University of Stellenbosch, Stellenbosch, South Africa
| | - Bogdan Jaroszewicz
- Białowieża Geobotanical Station, Faculty of Biology, University of Warsaw, Białowieża, Poland
| | - Akane O Abbasi
- Forest Advanced Computing and Artificial Intelligence Laboratory (FACAI), Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN, USA
| | - Meinrad Abegg
- Swiss National Forest Inventory/Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland
| | - Yves C Adou Yao
- UFR Biosciences, University Félix Houphouët-Boigny, Abidjan, Ivory Coast
| | - Jesús Aguirre-Gutiérrez
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford, UK
- Biodiversity Dynamics, Naturalis Biodiversity Center, Leiden, Netherlands
| | | | - Jan Altman
- Institute of Botany, Academy of Sciences of the Czech Republic, Trebon, Czech Republic
- Faculty of Forestry and Wood Sciences, Czech University of Life Sciences in Prague, Praha-Suchdol, Czech Republic
| | - Esteban Alvarez-Dávila
- Escuela ECAPMA, National Open University and Distance (Colombia) | UNAD, Bogotá, Colombia
| | | | - Luciana F Alves
- Center for Tropical Research, Institute of the Environment and Sustainability, University of California, Los Angeles, CA, USA
| | | | - Christian A Amani
- Université Officielle de Bukavu, Bukavu, Democratic Republic of Congo
| | - Christian Ammer
- Silviculture and Forest Ecology of the Temperate Zones, University of Göttingen, Goettingen, Germany
| | - Bhely Angoboy Ilondea
- Institut National pour l'Etude et la Recherche Agronomiques, Kinshasa, Democratic Republic of Congo
| | - Clara Antón-Fernández
- Norwegian Institute of Bioeconomy Research (NIBIO), Division of Forestry and Forest Resources, Ås, Norway
| | | | | | - Akomian F Azihou
- Laboratory of Applied Ecology, University of Abomey-Calavi, Cotonou, Benin
| | - Johan A Baard
- Scientific Services, South African National Parks, Knysna, South Africa
| | | | - Radomir Balazy
- Department of Geomatics, Forest Research Institute, Sekocin Stary, Raszyn, Poland
| | - Meredith L Bastian
- Proceedings of the National Academy of Sciences, Washington, DC, USA
- Department of Evolutionary Anthropology, Duke University, Durham, NC, USA
| | - Rodrigue Batumike
- Department of Environment, Universtité du Cinquantenaire de Lwiro, Bukavu, Democratic Republic of Congo
| | - Marijn Bauters
- Department of Environment, Ghent University, Ghent, Belgium
- Department of Green Chemistry and Technology, Ghent University, Ghent, Belgium
| | - Hans Beeckman
- Service of Wood Biology, Royal Museum for Central Africa, Tervuren, Belgium
| | | | - Robert Bitariho
- Institute of Tropical Forest Conservation, Mbarara University of Science and Technology, Mbarara, Uganda
| | - Pascal Boeckx
- Department of Green Chemistry and Technology, Ghent University, Ghent, Belgium
| | - Jan Bogaert
- Université de Liège, Gembloux Agro-Bio Tech, Gembloux, Belgium
| | - Frans Bongers
- Forest Ecology and Forest Management Group, Wageningen University and Research, Wageningen, Netherlands
| | - Olivier Bouriaud
- Integrated Center for Research, Development and Innovation in Advanced Materials, Nanotechnologies, and Distributed Systems for Fabrication and Control (MANSiD), University Stefan cel Mare of Suceava, Suceava, Romania
| | - Pedro H S Brancalion
- Department of Forestry Sciences, 'Luiz de Queiroz' College of Agriculture, University of São Paulo, Piracicaba, Brazil
| | | | - Francis Q Brearley
- Department of Natural Sciences, Manchester Metropolitan University, Manchester, UK
| | - Jaime Briseno-Reyes
- Facultad de Ciencias Forestales, Universidad Juárez del Estado de Durango, Durango, Mexico
| | - Eben N Broadbent
- School of Forest, Fisheries, and Geomatics Sciences, Institute of Food & Agricultural Sciences, University of Florida, Gainesville, FL, USA
| | - Helge Bruelheide
- Institute of Biology and Botanical Garden, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
| | - Erwin Bulte
- Development Economics Group, Wageningen University, Wageningen, Netherlands
| | - Ann Christine Catlin
- Rosen Center for Advanced Computing (RCAC), Purdue University, West Lafayette, IN, USA
| | - Roberto Cazzolla Gatti
- Department of Biological, Geological and Environmental Sciences (BiGeA), University of Bologna, Bologna, Italy
| | - Ricardo G César
- Department of Forestry Sciences, 'Luiz de Queiroz' College of Agriculture, University of São Paulo, Piracicaba, Brazil
| | - Han Y H Chen
- Faculty of Natural Resources Management, Lakehead University, Thunder Bay, Ontario, Canada
| | - Chelsea Chisholm
- Institute of Integrative Biology, ETH Zürich, Zürich, Switzerland
| | - Emil Cienciala
- IFER - Institute of Forest Ecosystem Research, Jilove u Prahy, Czech Republic
- Global Change Research Institute of the CAS, Brno, Czech Republic
| | - Gabriel D Colletta
- Programa de Pós-graduação em Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas, Campinas CEP, Biologia, Brazil
| | | | - Anibal Cuchietti
- Dirección Nacional de Bosques (DNB), Ministerio de Ambiente y Desarrollo Sostenible (MAyDS), Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina
| | - Aida Cuni-Sanchez
- Department of International Environment and Development Studies (Noragric), Faculty of Landscape and Society, Norwegian University of Life Sciences (NMBU), Ås, Norway
- Department of Environment and Geography, University of York, York, UK
| | - Javid A Dar
- Department of Environmental Science, School of Engineering and Sciences, SRM University-AP, Guntur, India
- Department of Botany, Dr. Harisingh Gour Vishwavidyalaya (A Central University), Madhya Pradesh, India
- Department of Ecology and Environmental Sciences, Pondicherry University, Puducherry, India
| | - Selvadurai Dayanandan
- Centre for Structural and Functional Genomics & Quebec Centre for Biodiversity Science, Biology Department, Concordia University, Montreal, Quebec, Canada
| | - Thales de Haulleville
- Service of Wood Biology, Royal Museum for Central Africa, Tervuren, Belgium
- Université de Liège, Gembloux Agro-Bio Tech, Gembloux, Belgium
| | - Mathieu Decuyper
- Forest Ecology and Forest Management Group, Wageningen University and Research, Wageningen, Netherlands
| | - Sylvain Delabye
- Department of Ecology, Faculty of Science, Charles University, Prague, Czech Republic
- Biology Centre of the Czech Academy of Sciences, Institute of Entomology, Ceske Budejovice, Czech Republic
| | - Géraldine Derroire
- Cirad, UMR EcoFoG (AgroParistech, CNRS, Inrae, Université des Antilles, Université de la Guyane), Campus Agronomique, Kourou, French Guiana
| | - Ben DeVries
- Department of Geography, Environment and Geomatics, University of Guelph, Guelph, Ontario, Canada
| | - John Diisi
- National Forest Authority, Kampala, Uganda
| | - Tran Van Do
- Department of Silviculture Foundation, Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam
| | - Jiri Dolezal
- Institute of Botany, Academy of Sciences of the Czech Republic, Trebon, Czech Republic
- Department of Botany, Faculty of Science, University of South Bohemia, Bohemia, Czech Republic
| | - Aurélie Dourdain
- Cirad, UMR EcoFoG (AgroParistech, CNRS, Inrae, Université des Antilles, Université de la Guyane), Campus Agronomique, Kourou, French Guiana
| | - Graham P Durrheim
- Scientific Services, South African National Parks, Knysna, South Africa
| | | | - Corneille E N Ewango
- Faculté de Gestion de Ressources Naturelles Renouvelables, Université de Kisangani, Kisangani, Democratic Republic of Congo
| | - Teresa J Eyre
- Queensland Herbarium, Department of Environment and Science, Toowong, Queensland, Australia
| | - Tom M Fayle
- Biology Centre of the Czech Academy of Sciences, Institute of Entomology, Ceske Budejovice, Czech Republic
- School of Biological and Behavioural Sciences, Queen Mary University of London, London, UK
| | | | - Leena Finér
- Natural Resources Institute Finland, Joensuu, Finland
| | - Markus Fischer
- Institute of Plant Sciences, University of Bern, Bern, Switzerland
| | - Jonas Fridman
- Department of Forest Resource Management, Swedish University of Agricultural Sciences, Umea, Sweden
| | - Lorenzo Frizzera
- Research and Innovation Centre, Fondazione Edmund Mach, San Michele all'Adige, Italy
| | - André L de Gasper
- Herbário Dr. Roberto Miguel Klein, Universidade Regional de Blumenau, Blumenau, Brazil
| | - Damiano Gianelle
- Research and Innovation Centre, Fondazione Edmund Mach, San Michele all'Adige, Italy
| | | | | | - Lev Gorenstein
- Rosen Center for Advanced Computing (RCAC), Purdue University, West Lafayette, IN, USA
| | - Richard Habonayo
- Département des Sciences et Technologies de l'Environnement, Université du Burundi, Bujumbura, Burundi
| | - Olivier J Hardy
- Faculté des Sciences, Evolutionary Biology and Ecology Unit, Université Libre de Bruxelles, Brussels, Belgium
| | | | - Andrew Hector
- Department of Plant Sciences, University of Oxford, Oxford, UK
| | - Andreas Hemp
- Department of Plant Systematics, Bayreuth University, Bayreuth, Germany
| | - Martin Herold
- Helmholtz GFZ German Research Centre for Geosciences, Section 1.4 Remote Sensing and Geoinformatics, Potsdam, Germany
| | - Annika Hillers
- Wild Chimpanzee Foundation, Liberia Representation, Monrovia, Liberia
- Centre for Conservation Science, The Royal Society for the Protection of Birds, Sandy, UK
| | - Wannes Hubau
- Service of Wood Biology, Royal Museum for Central Africa, Tervuren, Belgium
- Department of Environment, Laboratory for Wood Technology (UGent-Woodlab), Ghent University, Ghent, Belgium
| | - Thomas Ibanez
- AMAP, University of Montpellier, CIRAD, CNRS, INRAE, IRD, Montpellier, France
| | - Nobuo Imai
- Department of Forest Science, Tokyo University of Agriculture, Tokyo, Japan
| | - Gerard Imani
- Biology Department, Université Officielle de Bukavu, Bukavu, Democratic Republic of Congo
| | - Andrzej M Jagodzinski
- Institute of Dendrology, Polish Academy of Sciences, Kórnik, Poland
- Poznan University of Life Sciences, Faculty of Forestry and Wood Technology, Department of Game Management and Forest Protection, Poznan, Poland
| | - Stepan Janecek
- Department of Ecology, Faculty of Science, Charles University, Prague, Czech Republic
| | - Vivian Kvist Johannsen
- Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark
| | - Carlos A Joly
- Plant Biology Department, Biology Institute, University of Campinas (UNICAMP), Campinas, Brazil
| | - Blaise Jumbam
- Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, USA
- Institute of Agricultural Research for Development (IRAD), Nkolbisson, Ministry of Scientific Research and Innovation, Yaounde, Cameroon
| | - Banoho L P R Kabelong
- Department of Plant Biology, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
| | - Goytom Abraha Kahsay
- Department of Food and Resource Economics, University of Copenhagen, Copenhagen, Denmark
| | - Viktor Karminov
- Forestry Faculty, Bauman Moscow State Technical University, Mytischi, Russia
| | | | - Justin N Kassi
- Labo Botanique, Université Félix Houphouët-Boigny, Abidjan, Ivory Coast
| | - Elizabeth Kearsley
- Computational and Applied Vegetation Ecology Lab, Ghent University, Ghent, Belgium
| | - Deborah K Kennard
- Department of Physical and Environmental Sciences, Colorado Mesa University, Grand Junction, CO, USA
| | - Sebastian Kepfer-Rojas
- Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark
| | - Mohammed Latif Khan
- Department of Botany, Dr. Harisingh Gour Vishwavidalaya (A Central University), Sagar, India
| | - John N Kigomo
- Kenya Forestry Research Institute, Department of Forest Resource Assessment, Nairobi, Kenya
| | - Hyun Seok Kim
- Department of Forest Sciences, Seoul National University, Seoul, Republic of Korea
- Interdisciplinary Program in Agricultural and Forest Meteorology, Seoul National University, Seoul, Republic of Korea
- National Center for Agro Meteorology, Seoul, Republic of Korea
- Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea
| | - Carine Klauberg
- School of Forest, Fisheries, and Geomatics Sciences, Institute of Food & Agricultural Sciences, University of Florida, Gainesville, FL, USA
| | - Yannick Klomberg
- Department of Ecology, Faculty of Science, Charles University, Prague, Czech Republic
| | - Henn Korjus
- Institute of Forestry and Engineering, Estonian University of Life Sciences, Tartu, Estonia
| | - Subashree Kothandaraman
- Department of Botany, Dr. Harisingh Gour Vishwavidyalaya (A Central University), Madhya Pradesh, India
- Department of Ecology and Environmental Sciences, Pondicherry University, Puducherry, India
| | - Florian Kraxner
- International Institute for Applied Systems Analysis, Laxenburg, Austria
| | - Amit Kumar
- Department of Geoinformatics, Central University of Jharkhand, Ranchi, India
| | - Relawan Kuswandi
- Balai Penelitian dan Pengembangan Lingkungan Hidup dan Kehutanan, Manokwari, Indonesia
| | - Mait Lang
- Institute of Forestry and Engineering, Estonian University of Life Sciences, Tartu, Estonia
- Tartu Observatory, University of Tartu, Tõravere, Estonia
| | - Michael J Lawes
- School of Life Sciences, University of KwaZulu-Natal, Pietermaritzburg, South Africa
| | - Rodrigo V Leite
- Department of Forest Engineering, Federal University of Viçosa (UFV), Viçosa, Brazil
| | - Geoffrey Lentner
- Rosen Center for Advanced Computing (RCAC), Purdue University, West Lafayette, IN, USA
| | - Simon L Lewis
- School of Geography, University of Leeds, Leeds, UK
- Department of Geography, University College London, London, UK
| | - Moses B Libalah
- Department of Plant Biology, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
- Plant Systematics and Ecology Laboratory (LaBosystE), Higher Teacher's Training College, University of Yaoundé I, Yaoundé, Cameroon
| | - Janvier Lisingo
- Laboratoire d'Écologie et Aménagement Forestier, Département d'Ecologie et de Gestion des Ressources Végétales, Université de Kisangani, Kisangani, Democratic Republic of Congo
| | | | - Huicui Lu
- Faculty of Forestry, Qingdao Agricultural University, Qingdao, China
| | - Natalia V Lukina
- Center for Forest Ecology and Productivity RAS (CEPF RAS), Moscow, Russia
| | | | - Vincent Maicher
- Department of Ecology, Faculty of Science, Charles University, Prague, Czech Republic
- Biology Centre of the Czech Academy of Sciences, Institute of Entomology, Ceske Budejovice, Czech Republic
- Nicholas School of the Environment, Duke University, Durham, NC, USA
| | - Brian S Maitner
- Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, USA
| | - Eric Marcon
- Cirad, UMR EcoFoG (AgroParistech, CNRS, Inrae, Université des Antilles, Université de la Guyane), Campus Agronomique, Kourou, French Guiana
- AgroParisTech, UMR AMAP, University of Montpellier, CIRAD, CNRS, INRAE, IRD, Montpellier, France
| | - Andrew R Marshall
- University of the Sunshine Coast, Sippy Downs, Queensland, Australia
- University of York, York, UK
- Flamingo Land Ltd., North Yorkshire, UK
| | - Emanuel H Martin
- Department of Wildlife Management, College of African Wildlife Management, Mweka, Tanzania
| | - Olga Martynenko
- Forestry Faculty, Bauman Moscow State Technical University, Mytischi, Russia
| | - Faustin M Mbayu
- Faculté de Gestion de Ressources Naturelles Renouvelables, Université de Kisangani, Kisangani, Democratic Republic of Congo
| | | | - Jorge A Meave
- Departamento de Ecología y Recursos Naturales, Facultad de Ciencias, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Cory Merow
- Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, USA
| | - Stanislaw Miscicki
- Department of Forest Management and Forest Economics, Warsaw University of Life Sciences, Warsaw, Poland
| | - Vanessa S Moreno
- Department of Forestry Sciences, 'Luiz de Queiroz' College of Agriculture, University of São Paulo, Piracicaba, Brazil
| | - Albert Morera
- Joint Research Unit CTFC-Agrotecnio-CERCA, Solsona, Spain
| | - Sharif A Mukul
- Tropical Forests and People Research Centre, University of the Sunshine Coast, Maroochydore DC, Queensland, Australia
| | - Jörg C Müller
- Fieldstation Fabrikschleichach, Julius-Maximilians University Würzburg, Würzburg, Germany
- Bavarian Forest Nationalpark, Grafenau, Germany
| | - Agustinus Murdjoko
- Fakultas Kehutanan, Universitas Papua, Jalan Gunung Salju Amban, Manokwari Papua Barat, Indonesia
| | | | | | - Victor J Neldner
- Queensland Herbarium, Department of Environment and Science, Toowong, Queensland, Australia
| | | | - Louis N Nforbelie
- Department of Plant Biology, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
| | - Michael L Ngoh
- Tropical Plant Exploration Group (TroPEG), Buea, Cameroon
- Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN, USA
| | - Anny E N'Guessan
- UFR Biosciences, University Félix Houphouët-Boigny, Abidjan, Ivory Coast
| | - Michael R Ngugi
- Queensland Herbarium, Department of Environment and Science, Toowong, Queensland, Australia
| | - Alain S K Ngute
- Tropical Forests and People Research Centre, University of the Sunshine Coast, Maroochydore DC, Queensland, Australia
- Applied Biology and Ecology Research Unit, University of Dschang, Dschang, Cameroon
| | - Emile Narcisse N Njila
- Department of Plant Biology, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
| | - Melanie C Nyako
- Department of Plant Biology, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
| | - Thomas O Ochuodho
- Department of Forestry and Natural Resources, University of Kentucky, Lexington, KY, USA
| | - Jacek Oleksyn
- Institute of Dendrology, Polish Academy of Sciences, Kórnik, Poland
| | - Alain Paquette
- UQAM, Centre for Forest Research, Montreal, Quebec, Canada
| | - Elena I Parfenova
- V.N. Sukachev Forest Institute of FRC KSC SB RAS, Krasnoyarsk, Russia
| | - Minjee Park
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN, USA
| | - Marc Parren
- Forest Ecology and Forest Management Group, Wageningen University and Research, Wageningen, Netherlands
| | | | - Sebastian Pfautsch
- Urban Management and Planning, School of Social Sciences, Western Sydney University, Penrith, New South Wales, Australia
| | | | - Maria T F Piedade
- Instituto Nacional de Pesquisas da Amazônia-INPA, Grupo Ecologia. Monitoramento e Uso Sustentável de Áreas Úmidas MAUA, Manaus, Brazil
| | - Daniel Piotto
- Centro de Formação em Ciências Agroflorestais, Universidade Federal do Sul da Bahia, Ilhéus, Brazil
| | - Martina Pollastrini
- Department of Agriculture, Food, Environment and Forestry, University of Firenze, Firenze, Italy
| | - Lourens Poorter
- Forest Ecology and Forest Management Group, Wageningen University and Research, Wageningen, Netherlands
| | - John R Poulsen
- Nicholas School of the Environment, Duke University, Durham, NC, USA
| | | | - Hans Pretzsch
- Technical University of Munich, School of Life Sciences Weihenstephan, Chair of Forest Growth and Yield Science, Munich, Germany
| | - Mirco Rodeghiero
- Research and Innovation Centre, Fondazione Edmund Mach, San Michele all'Adige, Italy
- Centro Agricoltura, Alimenti, Ambiente, University of Trento, San Michele all'Adige, Italy
| | - Samir G Rolim
- Centro de Formação em Ciências Agroflorestais, Universidade Federal do Sul da Bahia, Ilhéus, Brazil
| | - Francesco Rovero
- Department of Biology, University of Florence, Sesto Fiorentino, Italy
- MUSE-Museo delle Scienze, Trento, Italy
| | | | - Khosro Sagheb-Talebi
- Agricultural Research, Education and Extension Organization (AREEO), Research Institute of Forests and Rangelands (RIFR), Tehran, Iran
| | - Purabi Saikia
- Department of Environmental Sciences, Central University of Jharkhand, Ranchi, India
| | - Moses Nsanyi Sainge
- Tropical Plant Exploration Group (TroPEG), Buea, Cameroon
- Institute of International Education Scholar Rescue Fund (IIE-SRF), One World Trade Center, New York, NY, USA
| | - Christian Salas-Eljatib
- Centro de Modelación y Monitoreo de Ecosistemas, Facultad de Ciencias, Universidad Mayor, Santiago, Chile
- Vicerrectoría de Investigación y Postgrado, Universidad de La Frontera, Temuco, Chile
- Departamento de Silvicultura y Conservación de la Naturaleza, Universidad de Chile, Santiago, Chile
| | - Antonello Salis
- Forestry Division, Food and Agriculture Organization of the United Nations, Rome, Italy
| | - Peter Schall
- Silviculture and Forest Ecology of the Temperate Zones, University of Göttingen, Goettingen, Germany
| | - Dmitry Schepaschenko
- International Institute for Applied Systems Analysis, Laxenburg, Austria
- V.N. Sukachev Forest Institute of FRC KSC SB RAS, Krasnoyarsk, Russia
- Рeoples Friendship University of Russia (RUDN University), Moscow, Russia
| | | | - Bernhard Schmid
- Institution with City, Department of Geography, University of Zurich, Zurich, Switzerland
| | - Jochen Schöngart
- Instituto Nacional de Pesquisas da Amazônia-INPA, Grupo Ecologia. Monitoramento e Uso Sustentável de Áreas Úmidas MAUA, Manaus, Brazil
| | | | - Giacomo Sellan
- Department of Natural Sciences, Manchester Metropolitan University, Manchester, UK
- CNRS-UMR LEEISA, Campus Agronomique, Kourou, French Guiana
| | - Federico Selvi
- Department of Agriculture, Food, Environment and Forestry, University of Firenze, Firenze, Italy
| | | | - Douglas Sheil
- Forest Ecology and Forest Management Group, Wageningen University and Research, Wageningen, Netherlands
- Center for International Forestry Research (CIFOR), Situ Gede, Bogor Barat, Indonesia
| | | | - Plinio Sist
- Cirad, University of Montpellier, Montpellier, France
| | - Alexandre F Souza
- Universidade Federal do Rio Grande do Norte, Departamento de Ecologia, Natal, Brazil
| | | | - Martin J P Sullivan
- Department of Natural Sciences, Manchester Metropolitan University, Manchester, UK
| | - Somaiah Sundarapandian
- Department of Ecology and Environmental Sciences, Pondicherry University, Puducherry, India
| | - Miroslav Svoboda
- Faculty of Forestry and Wood Sciences, Czech University of Life Sciences in Prague, Praha-Suchdol, Czech Republic
| | - Mike D Swaine
- School of Biological Sciences, University of Aberdeen, Aberdeen, UK
| | - Natalia Targhetta
- Instituto Nacional de Pesquisas da Amazônia-INPA, Grupo Ecologia. Monitoramento e Uso Sustentável de Áreas Úmidas MAUA, Manaus, Brazil
| | - Nadja Tchebakova
- V.N. Sukachev Forest Institute of FRC KSC SB RAS, Krasnoyarsk, Russia
| | | | - Robert Tropek
- Department of Ecology, Faculty of Science, Charles University, Prague, Czech Republic
- Biology Centre of the Czech Academy of Sciences, Institute of Entomology, Ceske Budejovice, Czech Republic
| | - John Tshibamba Mukendi
- Faculté des Sciences Appliquées, Université de Mbujimayi, Mbujimayi, Democratic Republic of Congo
| | | | - Vladimir A Usoltsev
- Ural State Forest Engineering University, Botanical Garden, Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russia
| | | | | | | | - Fons van der Plas
- Plant Ecology and Nature Conservation Group, Wageningen University, AA Wageningen, Netherlands
| | - Daniel José Vega-Nieva
- Facultad de Ciencias Forestales, Universidad Juárez del Estado de Durango, Durango, Mexico
| | - Hans Verbeeck
- Computational and Applied Vegetation Ecology Lab, Ghent University, Ghent, Belgium
| | - Helder Viana
- Agricultural High School, ESAV, Polytechnic Institute of Viseu, IPV, Viseu, Portugal
- Centre for the Research and Technology of Agro-Environmental and Biological Sciences, CITAB, UTAD, Quinta de Prados, Vila Real, Portugal
| | - Alexander C Vibrans
- Department of Forest Engineering, Universidade Regional de Blumenau, Blumenau, Brazil
| | - Simone A Vieira
- Nucleo de Estudos e Pesquisas Ambientais, Universidade Estadual de Campinas, Campinas (UNICAMP), SP, Campinas, Brazil
| | - Jason Vleminckx
- International Center for Tropical Botany, Department of Biological Sciences, Florida International University, Miami, FL, USA
| | - Catherine E Waite
- Forest Research Institute, University of the Sunshine Coast, Sippy Downs, Queensland, Australia
| | - Hua-Feng Wang
- Sanya Nanfan Research Institute, Hainan Yazhou Bay Seed Laboratory, Hainan University, Sanya, China
| | - Eric Katembo Wasingya
- Faculté de Gestion de Ressources Naturelles Renouvelables, Université de Kisangani, Kisangani, Democratic Republic of Congo
| | - Chemuku Wekesa
- Kenya Forestry Research Institute, Taita Taveta Research Centre, Wundanyi, Kenya
| | - Bertil Westerlund
- Department of Forest Resource Management, Swedish University of Agricultural Sciences, Umea, Sweden
| | - Florian Wittmann
- Department of Wetland Ecology, Institute for Geography and Geoecology, Karlsruhe Institute for Technology, Rastatt, Germany
| | - Verginia Wortel
- Department of Forest Management, Centre for Agricultural Research in Suriname, Paramaribo, Suriname
| | | | - Chunyu Zhang
- Research Center of Forest Management Engineering of State Forestry and Grassland Administration, Beijing Forestry University, Beijing, China
| | - Xiuhai Zhao
- Research Center of Forest Management Engineering of State Forestry and Grassland Administration, Beijing Forestry University, Beijing, China
| | - Jun Zhu
- Department of Statistics, University of Wisconsin-Madison, Madison, WI, USA
| | - Xiao Zhu
- Rosen Center for Advanced Computing (RCAC), Purdue University, West Lafayette, IN, USA
| | - Zhi-Xin Zhu
- Sanya Nanfan Research Institute, Hainan Yazhou Bay Seed Laboratory, Hainan University, Sanya, China
| | - Irie C Zo-Bi
- Institut National Polytechnique Félix Houphouët-Boigny, DFR Eaux, Forêts et Environnement, BP, Yamoussoukro, Ivory Coast
| | - Cang Hui
- Centre for Invasion Biology, Department of Mathematical Sciences, Stellenbosch University, Matieland, South Africa.
- African Institute for Mathematical Sciences, Muizenberg, South Africa.
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Gustafson EJ, Miranda BR, Dreaden TJ, Pinchot CC, Jacobs DF. Beyond blight: Phytophthora root rot under climate change limits populations of reintroduced American chestnut. Ecosphere 2022. [DOI: 10.1002/ecs2.3917] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Affiliation(s)
- Eric J. Gustafson
- Institute for Applied Ecosystem Studies USDA Forest Service, Northern Research Station Rhinelander Wisconsin USA
| | - Brian R. Miranda
- Institute for Applied Ecosystem Studies USDA Forest Service, Northern Research Station Rhinelander Wisconsin USA
| | - Tyler J. Dreaden
- Forest Health Research and Education Center USDA Forest Service, Southern Research Station Lexington Kentucky USA
| | | | - Douglass F. Jacobs
- Department of Forestry and Natural Resources Purdue University West Lafayette Indiana USA
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Sugiyama A, Friday JB, Giardina CP, Jacobs DF. Intraspecific Variation Along an Elevational Gradient Alters Seed Scarification Responses in the Polymorphic Tree Species Acacia koa. Front Plant Sci 2021; 12:716678. [PMID: 34804080 PMCID: PMC8601391 DOI: 10.3389/fpls.2021.716678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Accepted: 09/22/2021] [Indexed: 06/13/2023]
Abstract
Physical dormancy in seeds can challenge restoration efforts where scarification conditions for optimal germination and seedling vigor are unknown. For species that occur along wide environmental gradients, optimal scarification conditions may also differ by seed source. We examined intraspecific variation in optimal scarification conditions for germination and seedling performance in koa (Acacia koa), which occurs across a wide range of environmental conditions. To evaluate scarification responses, we recorded imbibition percentage, germination percentage, germination time, seedling abnormalities, early mortality, seedling growth, and seedling survivorship. From these, we developed a scarification index (SI) that integrates these measures simultaneously. We hypothesized that seeds from lower elevation sources exposed to higher temperatures would have harder seed coats and would require more intense scarification treatments. To test this hypothesis, we repeatedly exposed seeds to hot water differing in temperature and time until seeds imbibed. Supporting the hypothesis, seeds from lower elevation sources generally required more intense scarification, although we found substantial variation among sources. Koa seeds germinated in about a week following imbibition. Boiling seeds (i.e., maintaining at 100°C) was effective for imbibing seeds but it also substantially reduced germination percentages. Repeated exposure to 90 to 100°C water did not reduce germination percentage but decreased seedling performance and increased early mortality. No seeds remained unimbibed after six attempts of boiling germinated whereas seeds remaining unimbibed after 15 attempts of exposure to 90 to 100°C water showed high germination percentages. Abnormalities in seedling development were rare but increased with treatment intensity. Exposure to 100°C water for 1 min overall generated the best SI values but the best treatment differed by elevation, and the treatment with the best SI was rarely predicted from the highest germination percentages. Seeds that imbibed without any treatment germinated at the same level as manually filed seeds but produced poor seedling quality. Variation in mother tree environments along an elevational gradient can lead to differences in seed coat characteristics, which may explain differing responses to treatments. Scarification treatments affected processes beyond imbibition and germination and using an index like SI may improve efficiency by identifying optimal scarification treatments while reducing seed waste.
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Affiliation(s)
- Anna Sugiyama
- Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center, Purdue University, West Lafayette, IN, United States
- School of Life Sciences, Harold L. Lyon Arboretum, University of Hawai'i at Mānoa, Honolulu, HI, United States
| | - James B. Friday
- College of Tropical Agriculture and Human Resources, University of Hawai'i at Mānoa, Hilo, HI, United States
| | - Christian P. Giardina
- Institute of Pacific Islands Forestry, United States Department of Agriculture Forest Service, Hilo, HI, United States
| | - Douglass F. Jacobs
- Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center, Purdue University, West Lafayette, IN, United States
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Wu D, Yu X, Lai M, Feng J, Dong X, Peng W, Su S, Zhang X, Wan L, Jacobs DF, Zeng S. Diversified effects of co-planting landscape plants on heavy metals pollution remediation in urban soil amended with sewage sludge. J Hazard Mater 2021; 403:123855. [PMID: 33264931 DOI: 10.1016/j.jhazmat.2020.123855] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Revised: 08/15/2020] [Accepted: 08/23/2020] [Indexed: 06/12/2023]
Abstract
Recycling sewage sludge (SS) as a soil amendment potentially causes soil heavy metals (HMs) contamination. This study investigated the potential roles of landscape plants co-planting in SS-amended soil remediation. Three landscape trees Mangifera persiciforma, Bischofia javanica, and Neolamarckia cadamba (NC), and three ground cover plants Dianella ensifolia, Syngonium podophyllum, and Schefflera odorata (SO) were selected for the tree-ground cover co-planting. Species in different co-planting treatments exhibited diversified effects on the growth, root morphology, HMs uptake, and HMs accumulation. Five plant characteristics including total root length, total surface of roots (diameter <2 mm), specific root length, shoot dry weight and root dry weight played crucial roles in plant HMs uptake. Structural equation modeling analysis revealed that different co-planting treatments drive species to develop an active, passive, or avoidance strategy to accumulate HMs, resulting in a diversity of HMs removal efficiency. Co-planting of NC with SO promoted NC and SO HMs accumulation and resulted in the greatest HMs contents decline (48.0% for Cd, 24.9% for Cu, 33.8% for Zn, and 27.2% for Ni) and the lowest potential ecological risk. Co-planting of landscape tree and ground cover plants with an active strategy can be a potential candidate for HMs phytoremediation of SS-amended soil.
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Affiliation(s)
- Daoming Wu
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Xiaoli Yu
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou 510006, China
| | - Mingli Lai
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Jiayi Feng
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Xiaoquan Dong
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Weixin Peng
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Sining Su
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Xueping Zhang
- The Forestry Research Institute of Foshan City, Foshan 528000, China
| | - Lixin Wan
- The Forestry Research Institute of Foshan City, Foshan 528000, China
| | - Douglass F Jacobs
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907-2061, USA
| | - Shucai Zeng
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China.
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Toca A, Villar-Salvador P, Oliet JA, Jacobs DF. Normalization criteria determine the interpretation of nitrogen effects on the root hydraulics of pine seedlings. Tree Physiol 2020; 40:1381-1391. [PMID: 32483620 DOI: 10.1093/treephys/tpaa068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2019] [Accepted: 05/27/2020] [Indexed: 06/11/2023]
Abstract
Plant hydraulics is key for plant survival and growth because it is linked to gas exchange and drought resistance. Although the environment influences plant hydraulics, there is no clear consensus on the effect of nitrogen (N) supply, which may be, in part, due to different hydraulic conductance normalization criteria and studied species. The objective of this study was to compare the variation of root hydraulic properties using several normalization criteria in four pine species in response to three contrasting N fertilization regimes. We studied four closely related, yet ecologically distinct species: Pinus nigra J.F. Arnold, Pinus pinaster Ait., Pinus pinea L. and Pinus halepensis Mill. Root hydraulic conductance (Kh) was measured with a high-pressure flow meter, and values were normalized by total leaf area (leaf specific conductance, Kl), xylem cross-section area (xylem specific conductance, Ks), total root area (root specific conductance, Kr) and the area of fine roots (fine root specific conductance, Kfr). Controlling for organ size differences allowed comparison of the hydraulic efficiency of roots to supply or absorb water among fertilization treatments and species. The effect of N on the root hydraulic efficiency depended on the normalization criteria. Increasing N availability reduced Kl and Ks, but increased Kh, Kr and especially Kfr. The positive effect of N on Kr and Kfr was positively related to seedling relative growth rate and was also consistent with published results at the interspecific level, whereby plant hydraulics is positively linked to photosynthesis and transpiration rate and fast growth. In contrast, normalization by leaf area and xylem cross-sectional area (Kl and Ks) reflected opposite responses to Kr and Kfr. This indicates that the normalization criteria determine the interpretation of the effect of N on plant hydraulics, which can limit species and treatment comparisons.
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Affiliation(s)
- Andrei Toca
- Forest Ecology and Restoration Group, Departamento de Ciencias de la Vida, Universidad de Alcalá, Apdo 20, Alcalá de Henares, Madrid 28805, Spain
- Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center, Purdue University, 715 West State Street, West Lafayette, IN 47907, USA
| | - Pedro Villar-Salvador
- Forest Ecology and Restoration Group, Departamento de Ciencias de la Vida, Universidad de Alcalá, Apdo 20, Alcalá de Henares, Madrid 28805, Spain
| | - Juan A Oliet
- Departamento de Sistemas y Recursos Naturales, E.T.S. Ingenieros de Montes, Forestal y del Medio Natural, Universidad Politécnica de Ciudad Universitaria s/n, Madrid, 28040 Madrid, Spain
| | - Douglass F Jacobs
- Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center, Purdue University, 715 West State Street, West Lafayette, IN 47907, USA
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10
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Sigala JA, Uscola M, Oliet JA, Jacobs DF. Drought tolerance and acclimation in Pinus ponderosa seedlings: the influence of nitrogen form. Tree Physiol 2020; 40:1165-1177. [PMID: 32333785 DOI: 10.1093/treephys/tpaa052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 03/18/2020] [Accepted: 04/21/2020] [Indexed: 06/11/2023]
Abstract
Drought is a limiting factor to forest regeneration and restoration, which is likely to increase in intensity and duration under future climates. Nitrogen (N) nutrition is related to drought-resistance mechanisms in trees. However, the influence of chemical N form (inorganic and organic N) on physiological traits related to drought resistance has been sparsely studied in conifer seedlings. We investigated the effect of N forms on morpho-physiological traits of Pinus ponderosa Dougl. ex Laws. seedlings and subsequent influences in drought tolerance and acclimation. One-year-old seedlings were fertilized during 10 weeks at 9 mM N with different N forms [either NH4+, NO3- or organic N (amino acids mixture)] in their second year of growth. After fertilization, we measured traits associated with intrinsic drought tolerance (shoot water relations, osmotic regulation, photosynthesis and cell membrane stability). Seedlings were then subjected to an 8-week drought period at varying drought intensities to evaluate plant acclimation mechanisms. We demonstrated that P. ponderosa seedlings could efficiently use amino acids as a primary N source, showing similar performance to those grown with inorganic N forms. Nitrogen form influenced mainly drought-acclimation mechanisms rather than intrinsic drought tolerance. Osmotic potential at saturation (Ψπsat) was marginally affected by N form, and a significant relationship between proline concentration in needles and Ψπsat was found. During acclimation, seedlings fertilized with organic N minimized needle senescence, retained more nutrients in the oldest needles, had maximum increments in proline concentration and hastened the development of water-use efficiency mechanisms compared with those fertilized with inorganic N sources. Our results suggest an improved physiological drought acclimation of organic N-fertilized seedlings.
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Affiliation(s)
- José A Sigala
- Departamento de Sistemas y Recursos Naturales, ETS Ingenieros de Montes, Forestal y del Medio Natural, Universidad Politécnica de Madrid, José Antonio Novais 10, 28040 Madrid, Spain
- Forest Plantations and Agroforestry Program, Campo Experimental Valle del Guadiana, Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP), km 4.5 Carretera Durango-El Mezquital, 34170 Durango, Mexico
| | - Mercedes Uscola
- Forest Ecology and Restoration Group, Departamento de Ciencias de la Vida, Universidad de Alcalá Apdo. 20 Campus Universitario, 28805 Alcalá de Henares, Madrid, Spain
| | - Juan A Oliet
- Departamento de Sistemas y Recursos Naturales, ETS Ingenieros de Montes, Forestal y del Medio Natural, Universidad Politécnica de Madrid, José Antonio Novais 10, 28040 Madrid, Spain
| | - Douglass F Jacobs
- Department of Forestry and Natural Resources, Purdue University, 715 West State Street, West Lafayette, 47907 Indiana, USA
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11
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Medina-Villar S, Uscola M, Pérez-Corona ME, Jacobs DF. Environmental stress under climate change reduces plant performance, yet increases allelopathic potential of an invasive shrub. Biol Invasions 2020. [DOI: 10.1007/s10530-020-02286-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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12
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Ebrahimi A, Lawson SS, McKenna JR, Jacobs DF. Morpho-Physiological and Genomic Evaluation of Juglans Species Reveals Regional Maladaptation to Cold Stress. Front Plant Sci 2020; 11:229. [PMID: 32210997 PMCID: PMC7077431 DOI: 10.3389/fpls.2020.00229] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Accepted: 02/14/2020] [Indexed: 05/02/2023]
Abstract
Climate change may have unpredictable effects on the cold hardiness of woody species planted outside of their range of origin. Extreme undulations in temperatures may exacerbate susceptibility to cold stress, thereby interfering with productivity and ecosystem functioning. Juglans L. and their naturally occurring interspecific F1 hybrids, are distributed natively across many temperate regions, and J. regia has been extensively introduced. Cold hardiness, an environmental and genetic factor yet to be evaluated in many native and introduced Juglans species, may be a limiting factor under future climate change and following species introductions. We evaluated cold hardiness of native North American and Eastern Asian Juglans along with J. regia genotypes using field data from the Midwestern United States (Indiana), controlled freezing tests, and genome sequencing with close assessment of Juglans cold hardy genes. Many Juglans species previously screened for cold-hardiness were genotypes derived from the Midwest, California, and Europe. In 2014, despite general climate adaptation, Midwestern winter temperatures of -30°C killed J. regia originating from California; however, naturalized Midwestern J. regia survived and displayed low damage. Hybridization of J. regia with black walnut (J. nigra) and butternut (J. cinerea) produced F1s displaying greater cold tolerance than pure J. regia. Cold hardiness and growth are variable in Midwestern J. regia compared to native Juglans, East Asian Juglans, and F1 hybrids. Phylogeny analyses revealed that J. cinerea sorted with East Asian species using the nuclear genome but with North American species using the organellar genome. Investigation of selected cold hardy genes revealed that J. regia was distinct from other species and exhibited less genetic diversity than native Juglans species Average whole genome heterozygosity and Tajima's D for cold hardy genes was low within J. regia samples and significantly higher for hybrid as well as J. nigra. We confirmed that molecular and morpho-physiological data were highly correlated and thus can be used effectively to characterize cold hardiness in Juglans species. We conclude that the genetic diversity within local J. regia populations is low and additional germplasm is needed for development of more regionally adapted J. regia varieties.
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Affiliation(s)
- Aziz Ebrahimi
- Hardwood Tree Improvement and Regeneration Center, Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN, United States
| | - Shaneka S. Lawson
- USDA Forest Service, Northern Research Station, Hardwood Tree Improvement and Regeneration Center, West Lafayette, IN, United States
| | - James R. McKenna
- USDA Forest Service, Northern Research Station, Hardwood Tree Improvement and Regeneration Center, West Lafayette, IN, United States
| | - Douglass F. Jacobs
- Hardwood Tree Improvement and Regeneration Center, Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN, United States
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13
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Brennan AN, McKenna JR, Hoban SM, Jacobs DF. Hybrid Breeding for Restoration of Threatened Forest Trees: Evidence for Incorporating Disease Tolerance in Juglans cinerea. Front Plant Sci 2020; 11:580693. [PMID: 33178247 PMCID: PMC7596304 DOI: 10.3389/fpls.2020.580693] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Accepted: 09/14/2020] [Indexed: 05/06/2023]
Abstract
Hybridization is a potential tool for incorporating stress tolerance in plants, particularly to pests and diseases, in support of restoration and conservation efforts. Butternut (Juglans cinerea) is a species for which hybridization has only recently begun being explored. This North American hardwood tree is threatened due to Ophiognomonia clavigignenti-juglandacearum (Ocj), the causal fungus of butternut canker disease (BCD), first observed in 1967. Observational evidence in some wild J. cinerea populations indicates that naturalized hybrids of J. cinerea with Japanese walnut (Juglans ailantifolia) may be more tolerant to BCD than non-admixed J. cinerea, but this has not been formally tested in a controlled trial. We aimed to examine potential BCD tolerance within and between J. cinerea and J. cinerea × J. ailantifolia hybrids and to determine if there is a difference in canker growth between BCD fungal isolates. Five-year-old J. cinerea and hybrid trees were inoculated with two Ocj fungal isolates collected from natural infections found in two different sites in Indiana, United States, and a blank control (agar only). Measurements of both artificially induced and naturally occurring cankers were taken at 8-, 12-, 20-, 24-, and 32-month post-inoculation. Differences in canker presence/absence and size were observed by fungal isolate, which could help explain some of the differences in BCD severity seen between J. cinerea populations. Smaller and fewer cankers and greater genetic gains were seen in hybrid families, demonstrating that hybrids warrant further evaluation as a possible breeding tool for developing BCD-resistant J. cinerea trees.
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Affiliation(s)
- Andrea N. Brennan
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN, United States
| | - James R. McKenna
- USDA Forest Service, Northern Research Station, West Lafayette, IN, United States
| | | | - Douglass F. Jacobs
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN, United States
- *Correspondence: Douglass F. Jacobs,
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14
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Thyroff EC, Burney OT, Mickelbart MV, Jacobs DF. Unraveling Shade Tolerance and Plasticity of Semi-Evergreen Oaks: Insights From Maritime Forest Live Oak Restoration. Front Plant Sci 2019; 10:1526. [PMID: 31824542 PMCID: PMC6879670 DOI: 10.3389/fpls.2019.01526] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Accepted: 11/01/2019] [Indexed: 06/10/2023]
Abstract
Quercus spp. (oaks) are generally intermediate in shade tolerance, yet there is large variation within the genus in shade tolerance and plasticity in response to varying resource availability. Ecophysiological knowledge specific to semi-evergreen Quercus spp. from subtropical maritime forests is lacking relative to temperate deciduous oaks. We studied the influence of light availability and plant competition on leaf physiology and performance of semi-evergreen Quercus virginiana on a barrier island along the US southern Atlantic coast. Seedlings were underplanted in pine (Pinus taeda) plantation stands with varying overstory density (clear-cut, heavy thin, light thin, and non-thinned; creating a gradient of understory light availability) and vegetation (no competition removal or herbaceous competition removal) treatments. After 2 years, seedling survival was higher with increasing light availability (clear-cut = heavy thin > light thin > non-thinned). Seedling growth (i.e., diameter, height, and crown width) increased similarly with increasing thinning intensity, while vegetation control was mainly beneficial to seedling growth in clear-cuts. These responses were partially explained by foliar nitrogen and leaf trait measurements, which followed the same pattern. Q. virginiana seedlings demonstrated high plasticity in their ability to acclimate to varying resource availability, as indicated by light response curves, specific leaf area, stomatal density, stomatal pore index, and maximum theoretical stomatal conductance. Light compensation and saturation points illustrated seedling capacity to increase net CO2 assimilation with increased light availability. Leaves on trees in the high light environment had the highest net CO2 assimilation, stomatal density, stomatal pore index, maximum theoretical stomatal conductance, and lowest specific leaf area. Although we demonstrated the relative shade tolerance of Q. virginiana in lower light environments (i.e., heavy and light thin plots), this semi-evergreen species shows high plasticity in capacity to respond to varying resource availability, similar to other Quercus spp. from mesic and Mediterranean environments.
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Affiliation(s)
- Emily C. Thyroff
- Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center, Purdue University, West Lafayette, IN, United States
| | - Owen T. Burney
- John T. Harrington Forestry Research Center, New Mexico State University, Las Cruces, NM, United States
| | - Michael V. Mickelbart
- Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, United States
| | - Douglass F. Jacobs
- Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center, Purdue University, West Lafayette, IN, United States
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15
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Rose KME, Mickelbart MV, Jacobs DF. Plasticity of phenotype and heteroblasty in contrasting populations of Acacia koa. Ann Bot 2019; 124:399-409. [PMID: 31222279 PMCID: PMC6798841 DOI: 10.1093/aob/mcz083] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Accepted: 05/13/2019] [Indexed: 06/09/2023]
Abstract
BACKGROUND AND AIMS Heteroblastic plant species, whose morphology or growth habit changes suddenly during development, offer unique opportunities to investigate the role of selection in canalizing development or increasing the adaptive importance of plasticity. Leaf forms of the Hawaiian tree Acacia koa (koa) change morphologically and physiologically during the first year of growth, providing time to study abiotic factors influencing transition rates relative to other Acacia species. METHODS The roles of light and water availability in triggering transition to the mature leaf form in contrasting (wet/dry) ecotypes of koa were investigated using a novel modelling technique to distinguish between chronological and ontogenetic controls in triggering transition. A light quality treatment was included to test interactions of heterophylly (the presence of multiple leaf forms) with heteroblastic processes on the resulting phenotype at transition. KEY RESULTS Increased light intensity increased transition rates, but reduced red to far-red light (R:FR) ratios did not affect transition rates, solidifying the current paradigm of heteroblasty. However, evidence was found for earlier transition ontogenetically under water stress, which is not part of the current paradigm and could differentiate the role of heteroblasty in some Acacia species versus other heteroblastic species. Ecotypic responses also indicate that plasticity of development could vary across koa's range and the adaptive significance of heteroblasty could be marginalized or amplified dependent on the disparate selective pressures present across koa's range. CONCLUSIONS The use of novel survival functions and a species with an elongated transition time helped to elucidate abiotic modifiers of ontogenetic trajectories. Differences in ontogenetic trajectories between contrasting ecotypes suggest that ongoing climate and land use change will have non-uniform effects on koa regeneration and establishment dynamics across its range.
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Affiliation(s)
- Kyle M E Rose
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN, USA
- Department of Natural Resources Management, New Mexico Highlands University, Las Vegas, NM, USA
| | - Michael V Mickelbart
- Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, USA
| | - Douglass F Jacobs
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN, USA
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16
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Wu D, Feng J, Chu S, Jacobs DF, Tong X, Zhao Q, Chen X, Zeng S. Integrated application of sewage sludge, earthworms and Jatropha curcas on abandoned rare-earth mine land soil. Chemosphere 2019; 214:47-54. [PMID: 30253255 DOI: 10.1016/j.chemosphere.2018.09.087] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 09/01/2018] [Accepted: 09/16/2018] [Indexed: 06/08/2023]
Abstract
Improving soil fertility is a critical component of abandoned rare-earth mine land (ARL) revegetation. To study the effects of sewage sludge (SS), earthworms, and Jatropha curcas in ARL revegetation, SS (40% in mass ratio) and earthworms (0, 40, 60, and 80 individual adult Eisenia fetida kg-1) were applied to abandoned rare-earth mine land soil (ARLS) and then J. curcas was grown in a potting experiment. The organic carbon, nutrients (N, P, K) and heavy metals (HMs; Cd, Cu, Zn) contents in ARLS and the biomass and nutrients uptake in J. curcas were significantly increased by SS amendment. Application of 80 individual E. fetida kg-1 significantly increased availability of P and K in SS-amended ARLS relative to other treatments. Earthworms increased the height, ground diameter and biomass of J. curcas, but the promotion of biomass became weaker as earthworm density increased. After J. curcas harvest, the contents of Cd, Cu and Zn in SS-amended ARLS were reduced by 15%, 23%, and 19%, respectively. With the joint application of J. curcas and earthworms, a much larger decrease in contents of Cd (34-40%), Cu (31-44%) and Zn (24-29%) in SS-amended ARLS were observed, and the HMs ecological risks were reduced from "moderate potential" to "low potential". Moreover, J. curcas and earthworms together exerted more reduction in the exchangeable fraction HMs in SS-amended ARLS than J. curcas alone. Our results suggest that the integrated application of SS, earthworms and J. curcas is an effective approach for ARL revegetation.
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Affiliation(s)
- Daoming Wu
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Jiayi Feng
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Shuangshuang Chu
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Douglass F Jacobs
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907-2061, USA
| | - Xin Tong
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Qian Zhao
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Xiaoyang Chen
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Shucai Zeng
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China.
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17
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Chu S, Jacobs DF, Liao D, Liang LL, Wu D, Chen P, Lai C, Zhong F, Zeng S. Effects of landscape plant species and concentration of sewage sludge compost on plant growth, nutrient uptake, and heavy metal removal. Environ Sci Pollut Res Int 2018; 25:35184-35199. [PMID: 30334137 DOI: 10.1007/s11356-018-3416-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2018] [Accepted: 10/08/2018] [Indexed: 05/22/2023]
Abstract
Landscape plants have great potentials in heavy metals (HMs) removal as sewage sludge compost (SSC) is increasingly used in urban forestry. We hypothesize that woody plants might perform better in HMs phytoremediation because they have greater biomass and deeper roots than herbaceous plants. We tested the differences in growth responses and HMs phytoremediation among several herbaceous and woody species growing under different SSC concentrations through pot experiments. The mixing percentage of SSC with soil at 0%, 15%, 30%, 60, and 100% were used as growth substrate for three woody (Ficus altissima Bl., Neolamarckia cadamba (Roxb.) Bosser, and Bischofia javanica Bl.) and two herbaceous (Alocasia macrorrhiza (L.) G. Don and Dianella ensifolia (L.) DC) plants. Results showed that the biomass, relative growth rate, and nutrient uptake for all plants increased significantly at each SSC concentration compared to the control; woody plants had higher biomass and nutrient use efficiency than herbaceous plants. All plants growing in SSC-amended soils accumulated appreciable amounts of HMs and reduced the contents of HMs present in the substrates. The woody plants were generally more effective than herbaceous plants in potentials of HMs phytoextraction, but A. macrorrhiza showed higher bioconcentration and translocation of Cu and Zn and D. ensifolia had higher bioconcentration and translocation of Cd than woody plants. The optimal application concentrations were 30% or less for woody plants and 15% for herbaceous plants for plant growth and ecological risk control, respectively. Intercropping suitable woody and herbaceous landscape plants in urban forestry might have promising potentials to minimize the ecological risks in the phytoremediation of SSC.
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Affiliation(s)
- Shuangshuang Chu
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
| | - Douglass F Jacobs
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN, 47907-2061, USA
| | - Dandan Liao
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
| | - Liyin L Liang
- School of Science and Environmental Research Institute, University of Waikato, Private Bag 3105, Hamilton, 3240, New Zealand
| | - Daoming Wu
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
| | - Peijiang Chen
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
| | - Can Lai
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
| | - Fengdi Zhong
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
| | - Shucai Zeng
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China.
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18
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Gustafson EJ, Sturtevant BR, de Bruijn AMG, Lichti N, Jacobs DF, Kashian DM, Miranda BR, Townsend PA. Forecasting effects of tree species reintroduction strategies on carbon stocks in a future without historical analog. Glob Chang Biol 2018; 24:5500-5517. [PMID: 30003643 DOI: 10.1111/gcb.14397] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Accepted: 06/20/2018] [Indexed: 06/08/2023]
Abstract
American chestnut (Castanea dentata) was once an important component forests in the central Appalachians (USA), but it was functionally extirpated nearly a century ago. Attempts are underway to reintroduce blight-resistant chestnut to its former range, but it is uncertain how current forest composition, climate, and atmospheric changes and disturbance regimes will interact to determine future forest dynamics and ecosystem services. The combination of novel environmental conditions (e.g. climate change), a reintroduced tree species and new disturbance regimes (e.g. exotic insect pests, fire suppression) have no analog in the past that can be used to parameterize phenomenological models. We therefore used a mechanistic approach within the LANDIS-II forest landscape model that relies on physiological first principles to project forest dynamics as the outcome of competition of tree cohorts for light and water as a function of temperature, precipitation, CO2 concentration, and life history traits. We conducted a factorial landscape simulation experiment to evaluate specific hypotheses about future forest dynamics in two study sites in the center of the former range of chestnut. Our results supported the hypotheses that climate change would favor chestnut because of its optimal temperature range and relative drought resistance, and that chestnut would be less competitive in the more mesic Appalachian Plateau province because competitors will be less stressed. The hypothesis that chestnut will increase carbon stocks was supported, although the increase was modest. Our results confirm that aggressive restoration is needed regardless of climate and soils, and that increased aggressiveness of chestnut restoration increased biomass accumulation. The hypothesis that chestnut restoration will increase both compositional and structural richness was not supported because chestnut displaced some species and age cohorts. Although chestnut restoration did not markedly enhance carbon stocks, our findings provide hope that this formerly important species can be successfully reintroduced and associated ecosystem services recovered.
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Affiliation(s)
- Eric J Gustafson
- USDA Forest Service, Northern Research Station, Institute for Applied Ecosystem Studies, Rhinelander, Wisconsin
| | - Brian R Sturtevant
- USDA Forest Service, Northern Research Station, Institute for Applied Ecosystem Studies, Rhinelander, Wisconsin
| | - Arjan M G de Bruijn
- USDA Forest Service, Northern Research Station, Institute for Applied Ecosystem Studies, Rhinelander, Wisconsin
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, Indiana
| | - Nathanael Lichti
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, Indiana
| | - Douglass F Jacobs
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, Indiana
| | - Daniel M Kashian
- Department of Biological Sciences, Wayne State University, Detroit, Michigan
| | - Brian R Miranda
- USDA Forest Service, Northern Research Station, Institute for Applied Ecosystem Studies, Rhinelander, Wisconsin
| | - Philip A Townsend
- Department of Forestry and Wildlife Ecology, University of Wisconsin, Madison, Wisconsin
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19
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Wu D, Yu X, Chu S, Jacobs DF, Wei X, Wang C, Long F, Chen X, Zeng S. Alleviation of heavy metal phytotoxicity in sewage sludge by vermicomposting with additive urban plant litter. Sci Total Environ 2018; 633:71-80. [PMID: 29573693 DOI: 10.1016/j.scitotenv.2018.03.167] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 02/20/2018] [Accepted: 03/16/2018] [Indexed: 06/08/2023]
Abstract
The handling of sewage sludge (SS) and urban plant litter (UPL) has become an important concern. Immobilizing heavy metals (HMs) is regarded as a necessary process for recycling SS in agriculture and forestry. Here, HM removal and HM phytotoxicity in SS during vermicomposting with different additive UPLs was investigated. The results show that vermicomposting with additive UPL significantly reduced the content of HMs, and increased organic carbon content and the proportion of macroaggregates in SS. This process also significantly immobilized HMs by mainly transforming extractable and reducible HMs into residual products. The litters of Dracontomelon duperreanum and Bauhinia purpurea increased oxidizable HMs in SS and the accumulation capacity of HMs of earthworms during vermicomposting. The Cd content in vermicomposts with the B. purpurea litter addition was decreased by 31% relative to the initial SS. Maize in vermicomposts with UPL additions, especially with B. purpurea litter, exhibited significan5tly higher seed germination rates, seedling biomass, root activity, and a lower accumulation of HMs than in SS compost without UPL additions. These results suggest that vermicomposting with additive UPL can alleviate the phytotoxicity of HMs in SS and provides a new method for simultaneously recycling SS and UPL.
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Affiliation(s)
- Daoming Wu
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Xiaoli Yu
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
| | - Shuangshuang Chu
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Douglass F Jacobs
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907-2061, USA
| | - Xiaohua Wei
- Earth, Environmental and Geographical Sciences, University of British Columbia (Okanagan Campus), Kelowna, British Columbia V1V1V7, Canada
| | - Cai Wang
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Fengling Long
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Xiaoyang Chen
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
| | - Shucai Zeng
- College of Forestry & Landscape Architecture, South China Agricultural University, Guangzhou 510642, China.
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Abstract
Forests act as major sinks for atmospheric CO2. An understanding of the relationship between forest biomass allocation and precipitation gradients is needed to estimate the impacts of changes in precipitation on carbon stores. Biomass patterns depend on tree size or age, making it unclear whether biomass allocation is limited by tree age at regional scales. Using a dataset of ten typical forest types spanning a large age scale, we evaluated forest biomass allocation-precipitation correlations with the aim of testing whether biomass allocation patterns vary systematically in response to altered precipitation. With increasing mean annual precipitation, a significant quadratic increase occurred in ≤30 yr and >60 yr groups in stem biomass, >60 yr group in branch biomass, and >60 yr groups in leaf biomass; and a significant cubic increase occurred in 30-60 yr and all age forest groups in stem biomass, ≤30 yr, 30-60 yr and all age forest groups in branch biomass, ≤30 yr and all age forest groups in leaf biomass, and in each group in root biomass, indicating that organ biomass is strongly limited by precipitation. Thus, forest biomass responds predictably to changes in mean annual precipitation. The results suggest that forest organ biomass-precipitation relationships hold across independent datasets that encompass a broad climatic range and forest age.
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Affiliation(s)
- Zhiyang Lie
- College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou, 510642, P. R. China
| | - Li Xue
- College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou, 510642, P. R. China.
| | - Douglass F Jacobs
- Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center, Purdue University, West Lafayette, IN, 47907-2061, USA
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Skousen JG, Dallaire K, Scagline-Mellor S, Monteleone A, Wilson-Kokes L, Joyce J, Thomas C, Keene T, DeLong C, Cook T, Jacobs DF. Plantation performance of chestnut hybrids and progenitors on reclaimed Appalachian surface mines. New For (Dordr) 2018; 49:599-611. [PMID: 30147210 PMCID: PMC6096894 DOI: 10.1007/s11056-018-9643-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2018] [Accepted: 04/08/2018] [Indexed: 06/08/2023]
Abstract
Reclamation of surface mined sites to forests is a preferred post-mining land use option, but performance of planted trees on such sites is variable. American chestnut (Castanea dentata (Marsh.) Borkh.) is a threatened forest tree in the eastern USA that may become an important species option for mine reclamation. Chestnut restoration using backcross hybrids that incorporate blight resistance may be targeted to the Appalachian coal mining region, which corresponds closely with the species' native range. Thus, it is important to understand how chestnut hybrids perform relative to progenitors on reclamation sites to develop restoration prescriptions. Seeds of parents and three backcross generations of chestnut (100% American, 100% Chinese, and BC1F3, BC2F3, and BC3F2 hybrids) were planted into mine soils in West Virginia, USA with shelter treatments. Survival for all stock types was 44% after 8 years (American 39%, Chinese 77%, BC1F3 40%, BC2F3 28%, and BC3F2 35%). Height for all stock types was 33 cm after 8 years (American 28 cm, Chinese 67 cm, BC1F3 30 cm, BC2F3 21 cm, and BC3F2 20 cm). At another site a year later, seedlings of the chestnut stock types were planted into brown (pH 4.6) or gray sandstone (pH 6.3) mine soils and seedling survival across all stock types was 58% after 7 years. Chinese had the highest survival at 82%, while the others ranged from 38 to 66%. Height was 63 cm for all stock types after 7 years. More advanced backcross hybrids (BC2F3 and BC3F2) had the lowest vigor ratings at both sites after 7-8 years. Our results indicate that surface mines in Appalachia may provide a land base for planting blight-resistant chestnuts, although Chinese chestnut outperformed American chestnut and later generation backcross hybrids. As blight-resistant chestnuts establish and spread after planting, chestnut trees may become a component of the forest canopy again and possibly occupy its former niche, but their spread may alter future forest stand dynamics.
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Affiliation(s)
| | | | | | - Alexis Monteleone
- Thomas Jefferson Soil and Water Cons. District, Charlottesville, VA USA
| | | | | | | | | | | | - Thomas Cook
- Navigator Environmental Services, Summersville, OH USA
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22
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Toca A, Oliet JA, Villar-Salvador P, Maroto J, Jacobs DF. Species ecology determines the role of nitrogen nutrition in the frost tolerance of pine seedlings. Tree Physiol 2018; 38:96-108. [PMID: 29301052 DOI: 10.1093/treephys/tpx165] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Accepted: 11/25/2017] [Indexed: 06/07/2023]
Abstract
Frost determines the evolution and distribution of plants in temperate and cold regions. Several environmental factors can influence frost acclimation of woody plants but the magnitude and direction of the effect of nitrogen (N) availability is controversial. We studied the effect of N availability on root and shoot frost tolerance in mid-fall and in winter in seedlings of four pines of contrasting ecology: Pinus nigra J.F. Arnold, P. pinaster Ait., P. pinea L. and P. halepensis Mill.. Organ N and soluble sugar concentration, and timing of cessation of shoot elongation were measured to assess the physiological mechanisms underlying frost acclimation. Nitrogen was supplied at high and low rates only during the pre-hardening period and at a moderate N rate during hardening in the fall. Shoot frost tolerance increased over winter while root frost tolerance did not change in any species. Pre-hardening N availability affected the frost tolerance of both roots and shoots, although the effect was species-specific: high N reduced the overall root and shoot frost tolerance in P. pinea and P. halepensis, and increased the frost tolerance in P. nigra, but had no effect in P. pinaster. Nitrogen supply in the fall consistently increased frost tolerance in all species. Differences in frost tolerance among species and N treatments were not explained by variations in organ N or soluble carbohydrate concentration, nor by timing of cessation of shoot elongation; however, the most frost tolerant species ceased elongation earlier than the least frost tolerant species. Despite the close phylogenetic relatedness of the studied species, the effect of N availability on seedling frost tolerance differed among species, indicating that species ecology (especially frost acclimation physiology) and timing of N supply drives the effect of N availability on frost tolerance of pine species.
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Affiliation(s)
- Andrei Toca
- Forest Ecology and Restoration Group, Departamento de Ciencias de la Vida, Apdo 20, Universidad de Alcalá, E-28805, Alcalá de Henares, Madrid, Spain
- Hardwood Tree Improvement and Regeneration Center, Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907, USA
| | - Juan A Oliet
- E.T.S. Ingenieros de Montes, Forestal y del Medio Natural, Departamento de Sistemas y Recursos Naturales, Universidad Politécnica de Madrid, 28040 Madrid, Spain
| | - Pedro Villar-Salvador
- Forest Ecology and Restoration Group, Departamento de Ciencias de la Vida, Apdo 20, Universidad de Alcalá, E-28805, Alcalá de Henares, Madrid, Spain
| | - Judit Maroto
- Forest Ecology and Restoration Group, Departamento de Ciencias de la Vida, Apdo 20, Universidad de Alcalá, E-28805, Alcalá de Henares, Madrid, Spain
- E.T.S. Ingenieros de Montes, Forestal y del Medio Natural, Departamento de Sistemas y Recursos Naturales, Universidad Politécnica de Madrid, 28040 Madrid, Spain
| | - Douglass F Jacobs
- Hardwood Tree Improvement and Regeneration Center, Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907, USA
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23
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Owings CF, Jacobs DF, Shields JM, Saunders MR, Jenkins MA. Individual and interactive effects of white-tailed deer and an exotic shrub on artificial and natural regeneration in mixed hardwood forests. AoB Plants 2017; 9:plx024. [PMID: 28721187 PMCID: PMC5506343 DOI: 10.1093/aobpla/plx024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Accepted: 06/03/2017] [Indexed: 06/07/2023]
Abstract
Underplanting tree seedlings in areas where natural regeneration is limited may offer a tool by which desired overstory composition can be maintained or restored in forests. However, invasive plant species and ungulate browsing may limit the effectiveness of underplanting, and in-turn, the successful restoration of forest ecosystems. Individually, the invasive shrub Lonicera maackii and browsing by white-tailed deer (Odocoileus virginianus) have been found to negatively affect the regeneration of native tree species in the Midwestern United States, but few studies have examined their interactive or cumulative effects. Using exclosures and shrub removal at five sites, we examined the effects of white-tailed deer and L. maackii both on underplanted seedlings of Castanea dentata and Quercus rubra and on the composition, species richness and diversity of naturally regenerated native tree seedlings. Individually, both deer and L. maackii had negative effects on the survival of underplanted seedlings, but we identified no interactive effects. The presence of L. maackii or deer alone resulted in similar declines in the survivorship of Q. rubra seedlings, but the presence of deer alone resulted in lower survival of C. dentata seedlings than the presence of L. maackii alone. Lonicera maackii reduced light levels, increased seedling moisture stress and decreased relative basal diameter growth for Q. rubra seedlings. Deer reduced the relative growth in height of underplanted C. dentata and Q. rubra seedlings and increased moisture stress of C. dentata seedlings. No effects of L. maackii or deer were found on soil or foliar nitrogen or the overall abundance, species richness and diversity of naturally regenerated seedlings. However, L. maackii and white-tailed deer did affect the abundance of individual tree species, shifting composition of the regeneration layer towards shade tolerant and unpalatable and/or browse tolerant species.
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Affiliation(s)
- Charlotte F. Owings
- Department of Forestry and Natural Resources, Purdue University, 715 West State Street, West Lafayette, IN 47906, USA
| | - Douglass F. Jacobs
- Department of Forestry and Natural Resources, Purdue University, 715 West State Street, West Lafayette, IN 47906, USA
| | - Joshua M. Shields
- Manistee Conservation District, 8840 Chippewa Highway, Bear Lake, MI 49614, USA
| | - Michael R. Saunders
- Department of Forestry and Natural Resources, Purdue University, 715 West State Street, West Lafayette, IN 47906, USA
| | - Michael A. Jenkins
- Department of Forestry and Natural Resources, Purdue University, 715 West State Street, West Lafayette, IN 47906, USA
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24
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Gustafson EJ, Bruijn A, Lichti N, Jacobs DF, Sturtevant BR, Foster J, Miranda BR, Dalgleish HJ. The implications of American chestnut reintroduction on landscape dynamics and carbon storage. Ecosphere 2017. [DOI: 10.1002/ecs2.1773] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Affiliation(s)
- Eric J. Gustafson
- USDA Forest Service Northern Research Station Institute for Applied Ecosystem Studies Rhinelander Wisconsin 54501 USA
| | - Arjan Bruijn
- USDA Forest Service Northern Research Station Institute for Applied Ecosystem Studies Rhinelander Wisconsin 54501 USA
- Department of Forestry and Natural Resources Purdue University West Lafayette Indiana 47907 USA
| | - Nathanael Lichti
- Department of Forestry and Natural Resources Purdue University West Lafayette Indiana 47907 USA
| | - Douglass F. Jacobs
- Department of Forestry and Natural Resources Purdue University West Lafayette Indiana 47907 USA
| | - Brian R. Sturtevant
- USDA Forest Service Northern Research Station Institute for Applied Ecosystem Studies Rhinelander Wisconsin 54501 USA
| | - Jane Foster
- Department of Forest Resources University of Minnesota St. Paul Minnesota 55108 USA
| | - Brian R. Miranda
- USDA Forest Service Northern Research Station Institute for Applied Ecosystem Studies Rhinelander Wisconsin 54501 USA
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25
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Crystal PA, Lichti NI, Woeste KE, Jacobs DF. Vegetative and Adaptive Traits Predict Different Outcomes for Restoration Using Hybrids. Front Plant Sci 2016; 7:1741. [PMID: 27920788 PMCID: PMC5118422 DOI: 10.3389/fpls.2016.01741] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Accepted: 11/04/2016] [Indexed: 05/22/2023]
Abstract
Hybridization has been implicated as a driver of speciation, extinction, and invasiveness, but can also provide resistant breeding stock following epidemics. However, evaluating the appropriateness of hybrids for use in restoration programs is difficult. Past the F1 generation, the proportion of a progenitor's genome can vary widely, as can the combinations of parental genomes. Detailed genetic analysis can reveal this information, but cannot expose phenotypic alterations due to heterosis, transgressive traits, or changes in metabolism or development. In addition, because evolution is often driven by extreme individuals, decisions based on phenotypic averages of hybrid classes may have unintended results. We demonstrate a strategy to evaluate hybrids for use in restoration by visualizing hybrid phenotypes across selected groups of traits relative to both progenitor species. Specifically, we used discriminant analysis to differentiate among butternut (Juglans cinerea L.), black walnut (J. nigra L.), and Japanese walnut (J. ailantifolia Carr. var. cordiformis) using vegetative characters and then with functional adaptive traits associated with seedling performance. When projected onto the progenitor trait space, naturally occurring hybrids (J. × bixbyi Rehd.) between butternut and Japanese walnut showed introgression toward Japanese walnut at vegetative characters but exhibited a hybrid swarm at functional traits. Both results indicate that hybrids have morphological and ecological phenotypes that distinguish them from butternut, demonstrating a lack of ecological equivalency that should not be carried into restoration breeding efforts. Despite these discrepancies, some hybrids were projected into the space occupied by butternut seedlings' 95% confidence ellipse, signifying that some hybrids were similar at the measured traits. Determining how to consistently identify these individuals is imperative for future breeding and species restoration efforts involving hybrids. Discriminant analysis provides a useful technique to visualize past selection mechanisms and current variation in hybrid populations, especially when key ecological traits that distinguish progenitors are unknown. Furthermore, discriminant analysis affords a tool to assess ecological equivalency of hybrid populations and breeding program efforts to select for certain traits and monitor the amount of variability of those traits, relative to progenitors.
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Affiliation(s)
- Philip A. Crystal
- Hardwood Tree Improvement and Regeneration Center, Department of Forestry and Natural Resources, Purdue UniversityWest Lafayette, IN, USA
- Department of Biology, Colby CollegeWaterville, ME, USA
| | - Nathanael I. Lichti
- Hardwood Tree Improvement and Regeneration Center, Department of Forestry and Natural Resources, Purdue UniversityWest Lafayette, IN, USA
| | - Keith E. Woeste
- Hardwood Tree Improvement and Regeneration Center, Department of Forestry and Natural Resources, Purdue UniversityWest Lafayette, IN, USA
- Hardwood Tree Improvement and Regeneration Center, Northern Research Station, USDA Forest ServiceWest Lafayette, IN, USA
| | - Douglass F. Jacobs
- Hardwood Tree Improvement and Regeneration Center, Department of Forestry and Natural Resources, Purdue UniversityWest Lafayette, IN, USA
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26
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Sloan JL, Islam MA, Jacobs DF. Reduced translocation of current photosynthate precedes changes in gas exchange for Quercus rubra seedlings under flooding stress. Tree Physiol 2016; 36:54-62. [PMID: 26655380 DOI: 10.1093/treephys/tpv122] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 10/25/2015] [Indexed: 06/05/2023]
Abstract
Northern red oak (Quercus rubra L.) seedlings are frequently planted on suboptimal sites in their native range in North America, subjecting them to environmental stresses, such as flooding, for which they may not be well adapted. Members of the genus Quercus exhibit a wide range of responses to flooding, and responses of northern red oak to flooding remain inadequately described. To better understand the physiological effects of root system inundation in post-transplant northern red oak seedlings and the effects of flooding on endogenous patterns of resource allocation within the plant, we observed the effects of short-term flooding initiated at the linear shoot growth stage on net photosynthetic rates, dark respiration, chlorophyll fluorescence (Fv/Fm) and translocation of (13)C-labeled current photosynthate. Downward translocation of current photosynthate declined after 4 days of flooding and was the first measured physiological response to flooding; net photosynthetic rates decreased and dark respiration rates increased after 7 days of flooding. Short-term flooding did not affect maximal potential efficiency of photosystem II (Fv/Fm). The finding that decreased downward translocation of (13)C-labeled current photosynthate preceded reduced net photosynthesis and increased dark respiration during flooding suggests the occurrence of sink-limited photosynthesis under these conditions.
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Affiliation(s)
- Joshua L Sloan
- Hardwood Tree Improvement and Regeneration Center, Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47901-2061, USA Present address: John T. Harrington Forestry Research Center, New Mexico State University, PO Box 359, Mora, NM 87732, USA
| | - M Anisul Islam
- Hardwood Tree Improvement and Regeneration Center, Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47901-2061, USA Present address: Kuwait Institute for Scientific Research, PO Box 24885, Safat 13109, Kuwait
| | - Douglass F Jacobs
- Hardwood Tree Improvement and Regeneration Center, Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47901-2061, USA
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27
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Ying YQ, Song LL, Jacobs DF, Mei L, Liu P, Jin SH, Wu JS. Physiological response to drought stress in Camptotheca acuminata seedlings from two provenances. Front Plant Sci 2015; 6:361. [PMID: 26052334 PMCID: PMC4440367 DOI: 10.3389/fpls.2015.00361] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Accepted: 05/06/2015] [Indexed: 05/08/2023]
Abstract
Drought stress is a key environmental factor limiting the growth and productivity of plants. The purpose of this study was to investigate the physiological responses of Camptotheca acuminata (C. acuminata) to different drought stresses and compare the drought tolerance between the provenances Kunming (KM) and Nanchang (NC), which are naturally distributed in different rainfall zones with annual rainfalls of 1000-1100 mm and 1600-1700 mm, respectively. We determined relative water content (RWC), chlorophyll content [Chl(a+b)], net photosynthesis (Pn), gas exchange parameters, relative leakage conductivity (REC), malondialdehyde (MDA) content and superoxide dismutase (SOD) and peroxidase (POD) activities of C. acuminata seedlings under both moderate (50% of maximum field capacity) and severe drought stress (30% of maximum field capacity). As the degree of water stress increased, RWC, Chl(a+b) content, Pn, stomatal conductance (Gs), transpiration rate (Tr) and intercellular CO2 concentration (Ci) values decreased, but water use efficiency (WUE), REC, MDA content and SOD and POD activities increased in provenances KM and NC. Under moderate and severe drought stress, provenance KM had higher RWC, Chl(a+b), Pn, WUE, SOD, and POD and lower Gs, Tr, Ci, and REC in leaves than provenance NC. The results indicated that provenance KM may maintain stronger drought tolerance via improvements in water-retention capacity, antioxidant enzyme activity, and membrane integrity.
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Affiliation(s)
- Ye Q. Ying
- The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, School of Forestry and Biotechnology, Zhejiang Agricultural and Forestry University, Lin’an, China
| | - Li L. Song
- The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, School of Forestry and Biotechnology, Zhejiang Agricultural and Forestry University, Lin’an, China
| | - Douglass F. Jacobs
- Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center, Purdue University, West Lafayette, IN, USA
| | - Li Mei
- The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, School of Forestry and Biotechnology, Zhejiang Agricultural and Forestry University, Lin’an, China
| | - Peng Liu
- The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, School of Forestry and Biotechnology, Zhejiang Agricultural and Forestry University, Lin’an, China
| | - Song H. Jin
- The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, School of Forestry and Biotechnology, Zhejiang Agricultural and Forestry University, Lin’an, China
- Jiyang College, Zhejiang Agricultural and Forestry University, Lin’an, China
| | - Jia S. Wu
- The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, School of Forestry and Biotechnology, Zhejiang Agricultural and Forestry University, Lin’an, China
- *Correspondence: Jia S. Wu, The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, School of Forestry and Biotechnology, Zhejiang Agricultural and Forestry University, 88 North Circle Road, Lin’an 311300, Zhejiang, China,
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28
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Brown CE, Mickelbart MV, Jacobs DF. Leaf physiology and biomass allocation of backcross hybrid American chestnut (Castanea dentata) seedlings in response to light and water availability. Tree Physiol 2014; 34:1362-1375. [PMID: 25428828 DOI: 10.1093/treephys/tpu094] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Partial canopy cover promotes regeneration of many temperate forest trees, but the consequences of shading on seedling drought resistance are unclear. Reintroduction of blight-resistant American chestnut (Castanea dentata (Marsh.) Borkh.) into eastern North American forests will often occur on water-limited sites and under partial canopy cover. We measured leaf pre-dawn water potential (Ψpd), leaf gas exchange, and growth and biomass allocation of backcross hybrid American chestnut seedlings from three orchard sources grown under different light intensities (76, 26 and 8% full photosynthetically active radiation (PAR)) and subjected to well-watered or mid-season water-stressed conditions. Seedlings in the water-stress treatment were returned to well-watered conditions after wilting to examine recovery. Seedlings growing under medium- and high-light conditions wilted at lower leaf Ψpd than low-light seedlings. Recovery of net photosynthesis (Anet) and stomatal conductance (gs) was greater in low and medium light than in high light. Seed source did not affect the response to water stress or light level in most cases. Between 26 and 8% full PAR, light became limiting to the extent that the effects of water stress had no impact on some growth and morphological traits. We conclude that positive and negative aspects of shading on seedling drought tolerance and recovery are not mutually exclusive. Partial shade may help American chestnut tolerate drought during early establishment through effects on physiological conditioning.
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Affiliation(s)
- Caleb E Brown
- Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center, Purdue University, West Lafayette, IN 47907-2061, USA
| | - Michael V Mickelbart
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN 47907-2061, USA
| | - Douglass F Jacobs
- Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center, Purdue University, West Lafayette, IN 47907-2061, USA
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29
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Miller AC, Woeste KE, Anagnostakis SL, Jacobs DF. Exploration of a rare population of Chinese chestnut in North America: stand dynamics, health and genetic relationships. AoB Plants 2014; 6:plu065. [PMID: 25336337 PMCID: PMC4243075 DOI: 10.1093/aobpla/plu065] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/17/2014] [Accepted: 10/01/2014] [Indexed: 06/04/2023]
Abstract
With the transport of plants around the globe, exotic species can readily spread disease to their native relatives; however, they can also provide genetic resistance to those relatives through hybrid breeding programmes. American chestnut (Castanea dentata) was an abundant tree species in North America until its decimation by introduced chestnut blight. To restore chestnut in North America, efforts are ongoing to test putative blight-resistant hybrids of Castanea dentata and Chinese chestnut (Castanea mollissima), but little is known about the ecology of C. mollissima. In a forest in northeastern USA in which C. mollissima has become established, we explored questions of stand dynamics, health and genetic relationships of C. mollissima offspring to an adjacent parent orchard. We found that C. mollissima was adapted and randomly distributed among native species in this relatively young forest. The genetics of the C. mollissima population compared with its parents indicated little effect of selection pressure as each of the parent trees contributed at least one offspring. The ease with which this exotic species proliferated calls to question why C. mollissima is rare elsewhere in forests of North America. It is likely that a time window of low animal predation allowed seedlings to establish, and the shallow soil at this site limited the maximum forest canopy height, permitting the characteristically short-statured C. mollissima to avoid suppression. Our results indicate that because C. mollissima exhibited pioneer species characteristics, hybrids between C. mollissima and C. dentata have the potential to be successful pioneer species of future forests in North America, and we challenge the paradigm that exotic tree species are wholly detrimental to native biodiversity. We contend that exotic tree species should be assessed not only by their level of threat to native species, but also by their potential positive impacts on ecosystems via hybrid breeding programmes.
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Affiliation(s)
- Amy C Miller
- Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center, Purdue University, 715 West State St., West Lafayette, IN 47907, USA
| | - Keith E Woeste
- USDA Forest Service, Northern Research Station, Hardwood Tree Improvement and Regeneration Center, 715 West State St., West Lafayette, IN 47907, USA
| | | | - Douglass F Jacobs
- Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center, Purdue University, 715 West State St., West Lafayette, IN 47907, USA
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de Bruijn A, Gustafson EJ, Sturtevant BR, Foster JR, Miranda BR, Lichti NI, Jacobs DF. Toward more robust projections of forest landscape dynamics under novel environmental conditions: Embedding PnET within LANDIS-II. Ecol Modell 2014. [DOI: 10.1016/j.ecolmodel.2014.05.004] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Löf M, Bolte A, Jacobs DF, Jensen AM. Nurse Trees as a Forest Restoration Tool for Mixed Plantations: Effects on Competing Vegetation and Performance in Target Tree Species. Restor Ecol 2014. [DOI: 10.1111/rec.12136] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Magnus Löf
- Swedish University of Agricultural Sciences; Southern Swedish Forest Research Center; P.O. Box 49 SE-230 53 Alnarp Sweden
| | - Andreas Bolte
- Johann Heinrich von Thünen-Institut (TI), Federal Research Institute for Rural Areas, Forestry and Fisheries; Institute of Forest Ecosystems; Alfred-Möller-Straße 1 D-16225 Eberswalde Germany
| | - Douglass F. Jacobs
- Hardwood Tree Improvement and Regeneration Center, Department of Forestry and Natural Resources; Purdue University; 715 W State Street West Lafayette IN 47907-2061 U.S.A
| | - Anna M. Jensen
- Oak Ridge National Laboratory; Climate Change Science Institute; One Bethel Valley Road, P.O. Box 2800, MS6301 Oak Ridge TN 37831-6301 U.S.A
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Villar-Salvador P, Peñuelas JL, Jacobs DF. Nitrogen nutrition and drought hardening exert opposite effects on the stress tolerance of Pinus pinea L. seedlings. Tree Physiol 2013; 33:221-32. [PMID: 23370549 DOI: 10.1093/treephys/tps133] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Functional attributes determine the survival and growth of planted seedlings in reforestation projects. Nitrogen (N) and water are important resources in the cultivation of forest species, which have a strong effect on plant functional traits. We analyzed the influence of N nutrition on drought acclimation of Pinus pinea L. seedlings. Specifically, we addressed if high N fertilization reduces drought and frost tolerance of seedlings and whether drought hardening reverses the effect of high N fertilization on stress tolerance. Seedlings were grown under two N fertilization regimes (6 and 100 mg N per plant) and subjected to three drought-hardening levels (well-watered, moderate and strong hardening). Water relations, gas exchange, frost damage, N concentration and growth at the end of the drought-hardening period, and survival and growth of seedlings under controlled xeric and mesic outplanting conditions were measured. Relative to low-N plants, high-N plants were larger, had higher stomatal conductance (27%), residual transpiration (11%) and new root growth capacity and closed stomata at higher water potential. However, high N fertilization also increased frost damage (24%) and decreased plasmalemma stability to dehydration (9%). Drought hardening reversed to a great extent the reduction in stress tolerance caused by high N fertilization as it decreased frost damage, stomatal conductance and residual transpiration by 21, 31 and 24%, respectively, and increased plasmalemma stability to dehydration (8%). Drought hardening increased tissue non-structural carbohydrates and N concentration, especially in high-fertilized plants. Frost damage was positively related to the stability of plasmalemma to dehydration (r = 0.92) and both traits were negatively related to the concentration of reducing soluble sugars. No differences existed between moderate and strong drought-hardening treatments. Neither N nutrition nor drought hardening had any clear effect on seedling performance under xeric outplanting conditions. However, fertilization increased growth under mesic conditions, whereas drought hardening decreased growth. We conclude that drought hardening and N fertilization applied under typical container nursery operational conditions exert opposite effects on the physiological stress tolerance of P. pinea seedlings. While drought hardening increases overall stress tolerance, N nutrition reduces it and yet has no effect on the drought acclimation capacity of seedlings.
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Affiliation(s)
- Pedro Villar-Salvador
- Centro Nacional de Recursos Genéticos Forestales 'El Serranillo', Ministerio de Agricultura, Alimentación y Medio Ambiente, Apdo. 249, 19080 Guadalajara, Spain.
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Jacobs DF, Dalgleish HJ, Nelson CD. A conceptual framework for restoration of threatened plants: the effective model of American chestnut (Castanea dentata) reintroduction. New Phytol 2013; 197:378-393. [PMID: 23163342 DOI: 10.1111/nph.12020] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2012] [Accepted: 09/17/2012] [Indexed: 05/22/2023]
Abstract
We propose a conceptual framework for restoration of threatened plant species that encourages integration of technological, ecological, and social spheres. A sphere encompasses ideas relevant to restoration and the people working within similar areas of influence or expertise. Increased capacity within a sphere and a higher degree of coalescing among spheres predict a greater probability of successful restoration. We illustrate this with Castanea dentata, a foundation forest tree in North America that was annihilated by an introduced pathogen; the species is a model that effectively merges biotechnology, reintroduction biology, and restoration ecology. Because of C. dentata's ecological and social importance, scientists have aggressively pursued blight resistance through various approaches. We summarize recent advancements in tree breeding and biotechnology that have emerged from C. dentata research, and describe their potential to bring new tools to bear on socio-ecological restoration problems. Successful reintroduction of C. dentata will also depend upon an enhanced understanding of its ecology within contemporary forests. We identify a critical need for a deeper understanding of societal influences that may affect setting and achieving realistic restoration goals. Castanea dentata may serve as an important model to inform reintroduction of threatened plant species in general and foundation forest trees in particular.
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Affiliation(s)
- Douglass F Jacobs
- Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center, Purdue University, West Lafayette, Indiana, USA
| | - Harmony J Dalgleish
- Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center, Purdue University, West Lafayette, Indiana, USA
- Department of Biology, College of William and Mary, Williamsburg, Virginia, USA
| | - C Dana Nelson
- USDA Forest Service, Southern Research Station, Southern Institute of Forest Genetics, Saucier, Mississippi, USA
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Salifu KF, Jacobs DF, Birge ZKD. Nursery Nitrogen Loading Improves Field Performance of Bareroot Oak Seedlings Planted on Abandoned Mine Lands. Restor Ecol 2009. [DOI: 10.1111/j.1526-100x.2008.00373.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Sloan JL, Jacobs DF. Carbon translocation patterns associated with new root proliferation during episodic growth of transplanted Quercus rubra seedlings. Tree Physiol 2008; 28:1121-6. [PMID: 18450576 DOI: 10.1093/treephys/28.7.1121] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Patterns of carbon allocation in northern red oak (Quercus rubra L.), characterized by episodic growth through recurrent single-season flushing, vary by growth stage. To examine post-transplant timing and carbohydrate sources for new root growth, dormant, bare-root, half-sibling northern red oak seedlings were transplanted to pots and placed in a favorable growth chamber environment. Unlabeled seedlings were harvested at transplant and at the bud swell stage. After leaf emergence, seedlings were exposed to (14)CO(2) at the linear shoot, linear leaf or lag growth stages. Seedlings were then placed in a growth room for 48 h to allow for translocation of (14)C-labeled current photosynthate and its stabilization in sink component plant parts. Seedlings were subsequently harvested and tissue (14)C:(12)C ratio analyzed. New root growth began during the linear shoot growth stage. However, no increase in (14)C:(12)C ratio was found in new roots until the linear leaf and lag growth stages, indicating a downward shift in translocation of current photosynthate to fuel new root growth. In old roots, (14)C:(12)C ratio increased at the lag stage. Our results indicate that both stored carbohydrates and current photosynthate contribute to new root growth of transplanted northern red oak seedlings; stored carbohydrates promote initial new root proliferation, whereas current photosynthate assumes a greater role as new leaves mature and the flush terminates. Optimizing nursery practices to increase carbohydrate reserves may reduce the time required to establish root-soil contact and facilitate early post-planting survival.
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Affiliation(s)
- Joshua L Sloan
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907-2061, USA
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Michler CH, Pijut PM, Jacobs DF, Meilan R, Woeste KE, Ostry ME. Improving disease resistance of butternut (Juglans cinerea), a threatened fine hardwood: a case for single-tree selection through genetic improvement and deployment. Tree Physiol 2006; 26:121-8. [PMID: 16203722 DOI: 10.1093/treephys/26.1.121] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Approaches for the development of disease-resistant butternut (Juglans cinerea L.) are reviewed. Butternut is a threatened fine hardwood throughout its natural range in eastern North America because of the invasion of the exotic fungus, Sirococcus clavigignenti-juglandacearum Nair, Kostichka and Kuntz, which causes butternut canker. Early efforts were made to identify and collect putatively resistant germ plasm, identify vectors and to characterize the disease. More recently, molecular techniques have been employed to genetically characterize both the pathogen and the resistant germ plasm. Much of the host resistance may originate from hybridization with a close Asian relative, Japanese walnut (Juglans ailanthifolia Carr.), and from a few natural phenotypic variants. Further genetic characterization is needed before classical breeding or genetic modification can be used to produce canker-resistant trees.
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Affiliation(s)
- Charles H Michler
- USDA Forest Service, North Central Research Station, Hardwood Tree Improvement and Regeneration Center, West Lafayette, IN 47907-2061, USA.
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Ross-Davis AL, Broussard SR, Jacobs DF, Davis AS. Afforestation Motivations of Private Landowners: An Examination of Hardwood Tree Plantings in Indiana. ACTA ACUST UNITED AC 2005. [DOI: 10.1093/njaf/22.3.149] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
While a number of studies have investigated the objectives and characteristics of nonindus-trial private forestland (NIPF) owners as they relate to afforestation and reforestation decisions, very few studies have addressed these among NIPF owners in the Central Hardwood Forest Region of the United States, and even fewer have linked these to plantation establishment success. This article reports on such an examination in Indiana. Landowners were found to value their land for the privacy it provides, as a place of residence, and as a legacy for future generations. They afforested primarily to provide for future generations, to supply food and habitat for wildlife, and to conserve the natural environment. Seedling survival was lowest on sites owned by individuals who did not value their land as a legacy for future generations. Many NIPF owners are engaging in requisite behaviors to ensure plantation establishment success. The results of this study are discussed in terms of their importance as indicators of the influence of cost-share programs and the insight they provide into potential target areas for future programs.North. J. Appl. For. 22(3):149 –153.
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Affiliation(s)
- Amy L. Ross-Davis
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907
| | - Shorna R. Broussard
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907
| | - Douglass F. Jacobs
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907
| | - Anthony S. Davis
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907
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Jacobs DF, Haase DL, Rose R. Growth and Foliar Nutrition of Douglas-Fir Seedlings Provided with Supplemental Polymer-Coated Fertilizer. ACTA ACUST UNITED AC 2005. [DOI: 10.1093/wjaf/20.1.58] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Polymer-coated fertilizer (PCF) provides a potential means to optimize nutrient delivery for plant uptake, while minimizing leaching. Coating technology varies by manufacturer, which may alter patterns of nutrient release over time among comparable products. Three months following sowing, Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings were transplanted into containers with Osmocote Plus (OS) (15-9-12) and Apex (AP) (16-5-9) PCF (each with 5–6 month longevity) applied at four rates (0, 600, 1200, and 1800 mg total N per seedling) as a supplement to periodic addition of conventional water-soluble fertilizer. Seedlings fertilized with OS had 11% greater stem diameter growth during the first 4 months after transplant than those fertilized with AP, but differences were negligible after 9 months. After 4 months, foliar concentrations were 11% higher for N and 10% higher for P in seedlings fertilized with AP, although contents were the same. These results suggest that different PCF types have variable temporal patterns of nutrient release, which may affect seedling development over time. Differences among products must be understood by growers to help formulate fertilizer prescriptions that optimize plant response. Seedling response varied marginally among PCF rates, suggesting little benefit to PCF when used in conjunction with water-soluble fertilizer. West. J. Appl. For. 20(1):58–63.
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Affiliation(s)
- Douglass F. Jacobs
- Department of Forest Science Oregon State University Corvallis OR 97331-5752 Phone: (765) 494-3608
| | - Diane L. Haase
- Department of Forest Science Oregon State University Corvallis OR 97331-5752
| | - Robin Rose
- Department of Forest Science Oregon State University Corvallis OR 97331-5752
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Villar-Salvador P, Planelles R, Oliet J, Peñuelas-Rubira JL, Jacobs DF, González M. Drought tolerance and transplanting performance of holm oak (Quercus ilex) seedlings after drought hardening in the nursery. Tree Physiol 2004; 24:1147-55. [PMID: 15294761 DOI: 10.1093/treephys/24.10.1147] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Drought stress is the main cause of mortality of holm oak (Quercus ilex L.) seedlings in forest plantations. We therefore assessed if drought hardening, applied in the nursery at the end of the growing season, enhanced the drought tolerance and transplanting performance of holm oak seedlings. Seedlings were subjected to three drought hardening intensities (low, moderate and severe) for 2.5 and 3.5 months, and compared with control seedlings. At the end of the hardening period, water relations, gas exchange and morphological attributes were determined, and survival and growth under mesic and xeric transplanting conditions were assessed. Drought hardening increased drought tolerance primarily by affecting physiological traits, with no effect on shoot/root ratio or specific leaf mass. Drought hardening reduced osmotic potential at saturation and at the turgor loss point, stomatal conductance, residual transpiration (RT) and new root growth capacity (RGC), but enhanced cell membrane stability. Among treated seedlings, the largest response occurred in seedlings subjected to moderate hardening. Severe hardening reduced shoot soluble sugar concentration and increased shoot starch concentration. Increasing the duration of hardening had no effect on water relations but reduced shoot mineral and starch concentrations. Variation in cell membrane stability, RT and RGC were negatively related to osmotic adjustment. Despite differences in drought tolerance, no differences in mortality and relative growth rate were observed between hardening treatments when the seedlings were transplanted under either mesic or xeric conditions.
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Affiliation(s)
- Pedro Villar-Salvador
- Centro Nacional de Mejora Forestal El Serranillo, DGCONA, Ministerio de Medio Ambiente, Apdo. 249, 19004 Guadalajara, Spain.
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Abstract
Long term trends, based on findings from twenty independent prevalence studies surveying middle and high school youth in North America, suggest that within the past year two out of three legally underage youth have gambled for money. In the United States and Canada as many as 15.3 million 12-17 year olds have been gambling with or without adult awareness or approval, and 2.2 million of these are experiencing serious gambling-related problems. Lottery play dominates legalized forms of gambling among juveniles in both the United States and Canada. Trends between 1984-1999 indicate a substantial increase in the proportion of juveniles who report gambling within the past year, and a parallel increase in the proportion of juveniles reporting serious gambling-related problems. Yet, there continues to be little public awareness or concern about the extent, or the potential hazards associated with juvenile gambling. A composite profile of juveniles reporting numerous gambling problems is contrasted with their peers who reported few or none. Future prospects concerning this growing problem are offered.
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Affiliation(s)
- D F Jacobs
- Loma Linda University Medical Center, USA
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Cantú ES, Jacobs DF, Pai GS. An atypical Turner syndrome patient with ring X chromosome mosaicism. Ann Clin Lab Sci 1995; 25:60-5. [PMID: 7762970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Small marker chromosomes (SMC) associated with severe Turner syndrome (TS) variants often represent reduced X chromosomes lacking the X inactivation center (XIC), perturbed dosage compensation, and unbalanced gene expression. A TS patient with mental retardation (MR), unusually short stature, facial and limb malformations, and karyotypic mosaicism involving SMCs is described. Cytogenetic and fluorescence in situ hybridization (FISH) studies of blood and lymphoblastoid cells showed that the SMC was X-chromosome derived, contained a functional centromere, and had ring formation. Karyotypes of 45/46,X,r(X) in blood cells and 45,X/46,-XX/46,X,r(X)/47,X,r(X), + r(X) in fibroblasts were found. Late-replication of the SMC was inconclusive, but the X inactivation specific transcript (XIST) locus within XIC was demonstrated by fluorescent in situ hybridization (FISH). Mechanisms are reviewed that can account for our patient's unusual TS phenotype.
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Affiliation(s)
- E S Cantú
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston 29425, USA
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Abstract
The prevalence rate of potential and pathological gambling was examined among Native American and Caucasian patients (n = 85) being treated for alcohol dependence. Previous studies with alcohol-dependent (mainly Caucasian) populations revealed 10-15% to have gambling problems. This study, the first to measure pathological gambling among a Native American population, utilized the South Oaks Gambling Screen and was administered in a group setting, between 1/91 and 4/91 on the alcohol treatment ward of the Ft. Meade Veterans Administration Hospital. Results showed that 22% of the Native Americans studied (compared to 7.3% Caucasian), scored in a range indicating a probable pathological gambling addiction. Furthermore, 41% of the Native Americans studied (compared to 21.3% Caucasian) admitted to some difficulty with gambling. Education and treatment is encouraged to help stem projected radical increases in pathological gambling and related problems among this cultural group as Native American gambling becomes widespread.
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Affiliation(s)
- C Elia
- Department of Psychology, Fort Meade V.A.M.C., South Dakota 57741
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Abstract
Most members of the murine Hox gene system can be grouped into two subclasses based on their structural similarity to either one of the Drosophila homeotic genes Antennapedia (Antp) or Abdominal B (AbdB). All the AbdB-like genes reported thus far are located in the 5' region of their respective cluster. We describe here the isolation, structural characterization and spatio-temporal expression pattern of a new AbdB-like homeobox gene designated Hox-3.6 that is located in the 5' region of the Hox-3 cluster. Hox-3.6 has an extreme posterior expression domain in embryos of 12.5 days of gestation, a feature that has thus far only been observed for the 5' most genes of the Hox-4 cluster. Like the other members of the AbdB subfamily, Hox-3.6 exhibits spatially restricted expression in the hindlimb bud, but the expression domain is antero-proximal in contrast to the postero-distal domain reported for its cognate gene Hox-4.5. Structural analysis of the 5' region revealed the presence of a 35 bp sequence which shares homology and relative 5' position with an upstream sequence present in its two nearest downstream neighbors, Hox-3.2 and -3.1.
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Affiliation(s)
- R L Peterson
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston 29425-2211
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Abstract
Four naturalistic time-series studies contrasted adult male patients' use of hospital and clinic resources before and after their involvement in psychologist-directed programs of stress management, pain control, vocational rehabilitation, and coping skill training. Six months after biofeedback training, utilization rates for hospital days and clinic visits dropped 72% and 63%, respectively. One-year follow-ups showed that graduates of two vocational rehabilitation programs had reduced hospital days by 81 to 89% and clinic visits by 23 to 41%. After 1 year, graduates of an inpatient chronic pain program reduced former levels of hospital and clinic utilization by 72% and 50%, respectively. Three years later, hospital days of former pain patients remained 47% less than pretreatment, while clinic visits rose to pretreatment levels. Estimated medical cost-offsets from the four programs exceeded $7 million.
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Affiliation(s)
- D F Jacobs
- Jerry L. Pettis Memorial Veterans Hospital, Loma Linda, California
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Abstract
Starvation of the mouse hepatoma cell line Hepa for an essential amino acid (Trp, His, Leu, Ile or Phe) stimulated the incorporation of [3H]adenosine as ADP-ribose monomer into an 80,000-Mr protein, P80. Two-dimensional electrophoresis of Hepa proteins showed that P80 was the only protein labeled under starvation conditions. Time course experiments showed that the ADP-ribosylation of P80 was a consequence rather than the cause of reduced translational activity. Cycloheximide treatment and incubation at reduced temperatures also reduced the rate of protein synthesis and stimulated the ADP-ribosylation of P80. Starvation-dependent ADP-ribosylation of P80 was shown to occur in three other cell lines (Chang, Neuro-2a, and chick comb fibroblasts).
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Abstract
The synthesis of albumin in the liver has been shown to correlate with the availability of essential amino acids in the diet. We have investigated this phenomenon in the highly differentiated mouse hepatoma cell line, Hepa. Cells were grown for three days in complete medium with daily changes. The cells were then incubated for 22 h in media containing varying concentrations of individual essential amino acids. The deficient media were then changed; 1.5 h later the cells were labeled for 0.5 h with [3H]leucine. Albumin was immunoprecipitated and total protein was acid-precipitated from postribosomal supernatants of detergents-solubilized cells. With the exception of isoleucine, the relative rates of albumin synthesis decreased as a function of amino acid concentration from 4.3% in complete medium to 2.5% in totally deficient media. This specific reduction in albumin synthesis was confirmed by analysis of labeled Hepa proteins displayed on sodium dodecyl sulfate/polyacrylamide gels. Essential amino acid limitation reduced total protein synthesis by 50%. This is the result of a decrease in the translation efficiency of total mRNA from 5 to 3 polypeptides/message min-1 and is consistent with a reduction in the initiation rate. In contrast, the 70% decrease in albumin synthesis was a result of a reduced number of functional albumin messages/cell. The translation efficiency of these albumin messages remained unchanged at 1.
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