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[PMID]: 29324847
[Au] Autor:Wu Y; Ma W; Liu J; Zhu L; Cong L; Zhai J; Wang Y; Zhang Z
[Ad] Address:College of Nature Conservation, Beijing Forestry University, Beijing, China.
[Ti] Title:Sabina chinensis and Liriodendron chinense improve air quality in Beijing, China.
[So] Source:PLoS One;13(1):e0189640, 2018.
[Is] ISSN:1932-6203
[Cp] Country of publication:United States
[La] Language:eng
[Ab] Abstract:Urban forests have been shown to be efficient for reducing air pollutants especially for particulate matters (PMs). This study aims to reveal the PM blocking capacity of two common artificial landscape species, Sabina chinensis and Liriodendron chinense and to investigate spatial-temporal heterogeneities by estimating the vegetation collection velocity of coarse (PM10) and fine particles (PM2.5) during different seasons and heights. PM concentration and meteorological data were collected on both leeward and windward sides of trees during the daytime in both summers and winters from 2013 to 2015. Concentration and meteorological monitors were installed at three heights, bottom (1.5 m), middle (3.5 m), and top (5.5 m) of the canopy. The results showed: During daytime, the collection velocity changed and PM2.5 collection velocity was much higher than that of PM10. Furthermore, the maximum collection velocities of L. chinense and S. chinensis occurred at 14:00-16:00 both in summer and winter. Moreover, the collection velocity had a positive correlation with wind speed and temperature. The blocking capacities of L. chinense and S. chinensis varied from season to season, and the concentrations of particulate matter indicate the middle canopy of both species as the most effective part for TSP blocking. Furthermore, these two species are more effective blocking in PM2.5 than PM10. The blocking capacity of S. chinensis is generally better. The vegetation collection is the major process of PM removal near the ground and sedimentation was not taken into consideration near the ground.
[Mh] MeSH terms primary: Air Pollution
Forests
Liriodendron/metabolism
[Mh] MeSH terms secundary: Beijing
Models, Theoretical
Particulate Matter/analysis
[Pt] Publication type:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Name of substance:0 (Particulate Matter)
[Em] Entry month:1801
[Cu] Class update date: 180129
[Lr] Last revision date:180129
[Js] Journal subset:IM
[Da] Date of entry for processing:180112
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0189640

  2 / 177 MEDLINE  
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[PMID]: 29036648
[Au] Autor:Kannenberg SA; Novick KA; Phillips RP
[Ad] Address:Department of Biology, Indiana University, Bloomington, IN 47403, USA.
[Ti] Title:Coarse roots prevent declines in whole-tree non-structural carbohydrate pools during drought in an isohydric and an anisohydric species.
[So] Source:Tree Physiol;:1-9, 2017 Sep 26.
[Is] ISSN:1758-4469
[Cp] Country of publication:Canada
[La] Language:eng
[Ab] Abstract:Predicted increases in the frequency and severity of droughts have led to a renewed focus on how plants physiologically adjust to low water availability. A popular framework for understanding plant responses to drought characterizes species along a spectrum from isohydry to anisohydry based on their regulation of gas exchange and leaf water potential under drying conditions. One prediction that arises from this theory is that plant drought responses may hinge, in part, on their usage of non-structural carbohydrate (NSC) pools. For example, trees that respond to drought by closing stomates (i.e., isohydric) are predicted to deplete NSC reserves to maintain metabolism, whereas plants that keep stomata open during water stress (i.e., anisohydric), may show little change or even increases in NSC concentration. However, empirical tests of this theory largely rely on aboveground measurements of NSC, ignoring the potentially conflicting responses of root NSC pools. We sought to test these predictions by subjecting potted saplings of Quercus alba L. (an anisohydric species) and Liriodendron tulipifera L. (an isohydric species) to a 6 week experimental drought. We found that stem NSC concentrations were depleted in the isohydric L. tulipifera but maintained in the anisohydric Q. alba-as predicted. However, when scaled to whole-plant NSC content, the drought-induced decreases in stem NSCs in L. tulipifera were offset by increases in root NSCs (especially soluble sugars), resulting in no net change to whole-plant NSC content. Similarly, root sugars increased in Q. alba in response to drought. This increase was concurrent with declines in growth, suggesting a potential trade-off between allocation of photoassimilates to root sugars vs biomass during drought. Collectively, our results suggest that the responses of NSC in coarse roots can differ from stems, and indicate a prominent role of coarse roots in mitigating drought-induced declines in whole-tree NSC pools.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1710
[Cu] Class update date: 171016
[Lr] Last revision date:171016
[St] Status:Publisher
[do] DOI:10.1093/treephys/tpx119

  3 / 177 MEDLINE  
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[PMID]: 28985420
[Au] Autor:Fan H; McGuire MA; Teskey RO; Ryan M
[Ad] Address:College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
[Ti] Title:Effects of stem size on stem respiration and its flux components in yellow-poplar (Liriodendron tulipifera L.) trees.
[So] Source:Tree Physiol;:1-10, 2017 Jun 28.
[Is] ISSN:1758-4469
[Cp] Country of publication:Canada
[La] Language:eng
[Ab] Abstract:Carbon dioxide (CO2) released from respiring cells in the stems of trees (RS) can diffuse radially to the atmosphere (EA) or dissolve in xylem sap and move internally in the tree (FT). Previous studies have observed that EA decreases as stem or branch diameter increases, but the cause of this relationship has not been determined, nor has the relationship been confirmed between stem diameter and RS, which includes both EA and FT. In this study, for the first time the mass balance technique was used to estimate RS of stems of Liriodendron tulipifera L. trees of different diameters, ranging from 16 to 60 cm, growing on the same site. The magnitude of the component fluxes scaled with tree size. Among the five trees, the contribution of EA to RS decreased linearly with increasing stem diameter and sapwood area while the contribution of FT to RS increased linearly with stem diameter and sapwood area. For the smallest tree EA was 86% of RS but it was only 46% of RS in the largest tree. As tree size increased a greater proportion of respired CO2 dissolved in sap and remained within the tree. Due to increase in FT with tree size, we observed that trees of different sizes had the same RS even though they had different EA. This appears to explain why the EA of stems and branches decreases as their size increases.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1710
[Cu] Class update date: 171006
[Lr] Last revision date:171006
[St] Status:Publisher
[do] DOI:10.1093/treephys/tpx084

  4 / 177 MEDLINE  
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[PMID]: 28957463
[Au] Autor:Song Y; Yu WB; Tan Y; Liu B; Yao X; Jin J; Padmanaba M; Yang JB; Corlett RT
[Ad] Address:Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, China.
[Ti] Title:Evolutionary Comparisons of the Chloroplast Genome in Lauraceae and Insights into Loss Events in the Magnoliids.
[So] Source:Genome Biol Evol;9(9):2354-2364, 2017 Sep 01.
[Is] ISSN:1759-6653
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:Available plastomes of the Lauraceae show similar structure and varied size, but there has been no systematic comparison across the family. In order to understand the variation in plastome size and structure in the Lauraceae and related families of magnoliids, we here compare 47 plastomes, 15 newly sequenced, from 27 representative genera. We reveal that the two shortest plastomes are in the parasitic Lauraceae genus Cassytha, with lengths of 114,623 (C. filiformis) and 114,963 bp (C. capillaris), and that they have lost NADH dehydrogenase (ndh) genes in the large single-copy region and one entire copy of the inverted repeat (IR) region. The plastomes of the core Lauraceae group, with lengths from 150,749 bp (Nectandra angustifolia) to 152,739 bp (Actinodaphne trichocarpa), have lost trnI-CAU, rpl23, rpl2, a fragment of ycf2, and their intergenic regions in IRb region, whereas the plastomes of the basal Lauraceae group, with lengths from 157,577 bp (Eusideroxylon zwageri) to 158,530 bp (Beilschmiedia tungfangensis), have lost rpl2 in IRa region. The plastomes of Calycanthus (Calycanthaceae, Laurales) have lost rpl2 in IRb region, but the plastome of Caryodaphnopsis henryi (Lauraceae) remain intact, as do those of the nonLaurales magnoliid genera Piper, Liriodendron, and Magnolia. On the basis of our phylogenetic analysis and structural comparisons, different loss events occurred in different lineages of the Laurales, and fragment loss events in the IR regions have largely driven the contraction of the plastome in the Lauraceae. These results provide new insights into the evolution of the Lauraceae as well as the magnoliids as a whole.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1709
[Cu] Class update date: 171001
[Lr] Last revision date:171001
[St] Status:In-Process
[do] DOI:10.1093/gbe/evx180

  5 / 177 MEDLINE  
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[PMID]: 28924513
[Au] Autor:Gutiérrez-Ozuna R; Hamilton MB
[Ad] Address:Department of Biology, Georgetown University, 37th and O Streets NW, Washington, D.C. 20057 USA.
[Ti] Title:Identification and characterization of microsatellite loci in the tuliptree, (Magnoliaceae).
[So] Source:Appl Plant Sci;5(8), 2017 Aug.
[Is] ISSN:2168-0450
[Cp] Country of publication:United States
[La] Language:eng
[Ab] Abstract:PREMISE OF THE STUDY: Twenty-three polymorphic microsatellite loci (simple sequence repeats) were identified and characterized for (Magnoliaceae), a species native to eastern North America, to investigate its genetic diversity, population structure, and mating system. METHODS AND RESULTS: Using Illumina HiSeq paired-end reads from genomic DNA, searches for repeat motifs identified approximately 280,000 potentially amplifiable loci. Of 77 loci tested, 51 amplified consistently. When genotyped using 30 to 52 total adult trees from three old-growth populations in Maryland, Virginia, and New Jersey, USA, 23 loci were polymorphic. These loci exhibited four to 13 alleles, and observed and expected heterozygosities ranged from 0.233 to 0.865 and 0.272 to 0.876, respectively. CONCLUSIONS: The microsatellite marker loci presented here will be valuable in population genetic studies of because they do not suffer from ascertainment bias and show high polymorphism.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1709
[Cu] Class update date: 170922
[Lr] Last revision date:170922
[St] Status:PubMed-not-MEDLINE

  6 / 177 MEDLINE  
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[PMID]: 28550774
[Au] Autor:Choi WI; Ryu HJ; Kim SJ; Oh KK
[Ad] Address:R&D Center, SugarEn Co., Ltd., Yongin, Gyeonggi 16890, Republic of Korea.
[Ti] Title:Thermo-mechanical fractionation of yellow poplar sawdust with a low reaction severity using continuous twin screw-driven reactor for high hemicellulosic sugar recovery.
[So] Source:Bioresour Technol;241:63-69, 2017 Oct.
[Is] ISSN:1873-2976
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:Yellow poplar sawdust (YPS), a wood waste that can be easily collected from a local furniture factory, was fractionated using continuous twin screw-driven reactor for high hemicellulosic sugar recovery. The highest total sugar yields were attained under the following conditions: a barrel temperature of 127°C, sulfuric acid concentration of 0.8wt%, liquid feeding rate of 25mL/min, solid feeding rate of 2.0g/min, screw rotation speed of 25rpm, and residence time of 14.5min. The glucan and hemicellulose contents of the CTSR-fractionated YPS were 47.8% and 10.4%, respectively, and these results indicated that 44.9% of cellulose and 76.3% of the hemicellulose were extracted into liquid hydrolyzate. Meanwhile, the batch fractionation of YPS at the same reaction conditions showed a little fractionation effect, i.e., only 20.5% of hemicellulosic sugar yield was obtained.
[Mh] MeSH terms primary: Bioreactors
Liriodendron
[Mh] MeSH terms secundary: Carbohydrates
Hydrolysis
Sucrose
Wood
[Pt] Publication type:JOURNAL ARTICLE
[Nm] Name of substance:0 (Carbohydrates); 57-50-1 (Sucrose)
[Em] Entry month:1711
[Cu] Class update date: 171106
[Lr] Last revision date:171106
[Js] Journal subset:IM
[Da] Date of entry for processing:170528
[St] Status:MEDLINE

  7 / 177 MEDLINE  
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[PMID]: 28486656
[Au] Autor:Coble AP; Fogel ML; Parker GG
[Ad] Address:Department of Natural Resources and the Environment, University of New Hampshire, 56 College Rd, James Hall Room 114, Durham, NH 03824,USA.
[Ti] Title:Canopy gradients in leaf functional traits for species that differ in growth strategies and shade tolerance.
[So] Source:Tree Physiol;37(10):1415-1425, 2017 Oct 01.
[Is] ISSN:1758-4469
[Cp] Country of publication:Canada
[La] Language:eng
[Ab] Abstract:In temperate deciduous forests, vertical gradients in leaf mass per area (LMA) and area-based leaf nitrogen (Narea) are strongly controlled by gradients in light availability. While there is evidence that hydrostatic constraints on leaf development may diminish LMA and Narea responses to light, inherent differences among tree species may also influence leaf developmental and morphological response to light. We investigated vertical gradients in LMA, Narea and leaf carbon isotope composition (δ13C) for three temperate deciduous species (Carpinus caroliniana Walter, Fagus grandifolia Ehrh., Liriodendron tulipifera L.) that differed in growth strategy (e.g., indeterminate and determinate growth), shade tolerance and leaf area to sapwood ratio (Al:As). Leaves were sampled across a broad range of light conditions within three vertical layers of tree crowns to maximize variation in light availability at each height and to minimize collinearity between light and height. All species displayed similar responses to light with respect to Narea and δ13C, but not for LMA. Light was more important for gradients in LMA for the shade-tolerant (C. caroliniana) and -intolerant (L. tulipifera) species with indeterminate growth, and height (e.g., hydrostatic gradients) and light were equally important for the shade-tolerant (F. grandifolia) species with determinate growth. Fagus grandifolia had a higher morphological plasticity in response to light, which may offer a competitive advantage in occupying a broader range of light conditions throughout the canopy. Differences in responses to light and height for the taller tree species, L. tulipifera and F. grandifolia, may be attributed to differences in growth strategy or Al:As, which may alter morphological and functional responses to light availability. While height was important in F. grandifolia, height was no more robust in predicting LMA than light in any of the species, confirming the strong role of light availability in determining LMA for temperate deciduous species.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1705
[Cu] Class update date: 171031
[Lr] Last revision date:171031
[St] Status:In-Process
[do] DOI:10.1093/treephys/tpx048

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[PMID]: 28357799
[Au] Autor:Pellegrini E; Campanella A; Cotrozzi L; Tonelli M; Nali C; Lorenzini G
[Ad] Address:Department of Agriculture, Food and Environment, University of Pisa, Via del Borghetto 80, 56124, Pisa, Italy.
[Ti] Title:What about the detoxification mechanisms underlying ozone sensitivity in Liriodendron tulipifera?
[So] Source:Environ Sci Pollut Res Int;, 2017 Mar 29.
[Is] ISSN:1614-7499
[Cp] Country of publication:Germany
[La] Language:eng
[Ab] Abstract:Liriodendron tulipifera (known as the tulip tree) is a woody species that has been previously classified as sensitive to ozone (O ) in terms of visible leaf injuries and photosynthetic primary reactions. The objective of this work is to give a thorough description of the detoxification mechanisms that are at the basis of O sensitivity. Biochemical and molecular markers were used to characterize the response of 1-year-old saplings exposed to O (120 ppb, 5 h day , for 45 consecutive days) under controlled conditions. O effects resulted in a less efficient metabolism of Halliwell-Asada cycle as confirmed by the diminished capacity to convert the oxidized forms of ascorbate and glutathione in the reduced ones (AsA and GSH, respectively). The reduced activity of AsA and GSH regenerating enzymes indicates that de novo AsA biosynthesis occurred. This compound could be a cofactor of several plant-specific enzymes that are involved in the early part of the phenylpropanoid and flavonoid biosynthesis pathway, as confirmed by the significant rise of PAL activity (+75%). The induction of the defence-related secondary metabolites (in particular, rutin and caffeic acid were about threefold higher) and the concomitant increase in transcript levels of PAL and CHS genes (+120 and 30%, respectively) suggest that L. tulipifera utilized this route in order to partially counteract the O -induced oxidative damage.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1703
[Cu] Class update date: 170330
[Lr] Last revision date:170330
[St] Status:Publisher
[do] DOI:10.1007/s11356-017-8818-7

  9 / 177 MEDLINE  
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[PMID]: 28323890
[Au] Autor:Huo A; Chen Z; Wang P; Yang L; Wang G; Wang D; Liao S; Cheng T; Chen J; Shi J
[Ad] Address:Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, China.
[Ti] Title:Establishment of transient gene expression systems in protoplasts from Liriodendron hybrid mesophyll cells.
[So] Source:PLoS One;12(3):e0172475, 2017.
[Is] ISSN:1932-6203
[Cp] Country of publication:United States
[La] Language:eng
[Ab] Abstract:Liriodendron is a genus of the magnolia family comprised of two flowering tree species that produce hardwoods of great ecological and economic value. However, only a limited amount of genetic research has been performed on the Liriodendron genus partly because transient or stable transgenic trees have been difficult to produce. In general, transient expression systems are indispensable for rapid, high-throughput screening and systematic characterization of gene functions at a low cost; therefore, development of such a system for Liriodendron would provide a necessary step forward for research on Magnoliaceae and other woody trees. Herein, we describe an efficient and rapid protocol for preparing protoplasts from the leaf mesophyll tissue of a Liriodendron hybrid and an optimized system for polyethylene glycol-mediated transient transfection of the protoplasts. Because the leaves of the Liriodendron hybrid are waxy, we formulated an enzyme mix containing 1.5% (w/v) Cellulase R-10, 0.5% (w/v) Macerozyme R-10, and 0.1% (w/v) Pectolyase Y-23 to efficiently isolate protoplasts from the Liriodendron hybrid leaf mesophyll tissue in 3 h. We optimized Liriodendron protoplast transfection efficiency by including 20 µg plasmid DNA per 104 protoplasts, a transformation time of 20 min, and inclusion of 20% (w/v) polyethylene glycol 4000. After integrating the Liriodendron WOX1 gene into pJIT166-GFP to produce a WOX1-GFP fusion product and transfecting it into isolated protoplasts, LhWOX1-GFP was found to localize to the nucleus according to its green fluorescence.
[Mh] MeSH terms primary: Gene Expression
Liriodendron
Mesophyll Cells
Protoplasts
Transfection
[Mh] MeSH terms secundary: Cell Culture Techniques
Genetic Vectors
Luminescent Proteins/genetics
Luminescent Proteins/metabolism
Mesophyll Cells/metabolism
Plant Leaves
Plant Proteins/genetics
Plant Proteins/metabolism
Protoplasts/metabolism
[Pt] Publication type:JOURNAL ARTICLE
[Nm] Name of substance:0 (Luminescent Proteins); 0 (Plant Proteins)
[Em] Entry month:1708
[Cu] Class update date: 170823
[Lr] Last revision date:170823
[Js] Journal subset:IM
[Da] Date of entry for processing:170322
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0172475

  10 / 177 MEDLINE  
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[PMID]: 28062727
[Au] Autor:Yi K; Dragoni D; Phillips RP; Roman DT; Novick KA
[Ad] Address:School of Public and Environmental Affairs, Indiana University Bloomington, 1315 East Tenth Street, Bloomington, IN 47405, USA.
[Ti] Title:Dynamics of stem water uptake among isohydric and anisohydric species experiencing a severe drought.
[So] Source:Tree Physiol;37(10):1379-1392, 2017 Oct 01.
[Is] ISSN:1758-4469
[Cp] Country of publication:Canada
[La] Language:eng
[Ab] Abstract:Predicting the impact of drought on forest ecosystem processes requires an understanding of trees' species-specific responses to drought, especially in the Eastern USA, where species composition is highly dynamic due to historical changes in land use and fire regime. Here, we adapted a framework that classifies trees' water-use strategy along the spectrum of isohydric to anisohydric behavior to determine the responses of three canopy-dominant species to drought. We used a collection of leaf-level gas exchange, tree-level sap flux and stand-level eddy covariance data collected in south-central Indiana from 2011 to 2013, which included an unusually severe drought in the summer of 2012. Our goal was to assess how patterns in the radial profile of sap flux and reliance on hydraulic capacitance differed among species of contrasting water-use strategies. In isohydric species, which included sugar maple (Acer saccharum Marsh.) and tulip poplar (Liriodendron tulipifera L.), we found that the sap flux in the outer xylem experienced dramatic declines during drought, but sap flux at inner xylem was buffered from reductions in water availability. In contrast, for anisohydric oak species (Quercus alba L. and Quercus rubra L.), we observed relatively smaller variations in sap flux during drought in both inner and outer xylem, and higher nighttime refilling when compared with isohydric species. This reliance on nocturnal refilling, which occurred coincident with a decoupling between leaf- and tree-level water-use dynamics, suggests that anisohydric species may benefit from a reliance on hydraulic capacitance to mitigate the risk of hydraulic failure associated with maintaining high transpiration rates during drought. In the case of both isohydric and anisohydric species, our work demonstrates that failure to account for shifts in the radial profile of sap flux during drought could introduce substantial bias in estimates of tree water use during both drought and non-drought periods.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1701
[Cu] Class update date: 171031
[Lr] Last revision date:171031
[St] Status:In-Process
[do] DOI:10.1093/treephys/tpw126


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