Tree physiology最新文献

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PyWRKY48 directly activates PyMTP10 to confer cadmium tolerance and accumulation in poplar. PyWRKY48直接激活PyMTP10,赋予杨树对镉的耐性和积累。
IF 4 2区 农林科学
Tree physiology Pub Date : 2026-08-01 DOI: 10.1093/treephys/tpag091
Xiaoxi Chen, Meng Liu, Jie Yang, Keran Zhu, Kaixuan Xiao, Ruixue Hao, Xiangyu Zhou, Feifei Tian, Xinyi Wang, Han Wu, Qinglin Liu, Xueqin Wan, Fan Zhang
{"title":"PyWRKY48 directly activates PyMTP10 to confer cadmium tolerance and accumulation in poplar.","authors":"Xiaoxi Chen, Meng Liu, Jie Yang, Keran Zhu, Kaixuan Xiao, Ruixue Hao, Xiangyu Zhou, Feifei Tian, Xinyi Wang, Han Wu, Qinglin Liu, Xueqin Wan, Fan Zhang","doi":"10.1093/treephys/tpag091","DOIUrl":"10.1093/treephys/tpag091","url":null,"abstract":"<p><p>Cadmium (Cd) contamination is a major environmental concern that threatens plant growth and human health. Poplar (Populus spp.) is a promising candidate for phytoremediation due to its high biomass, extensive root system and strong capacity for heavy metal tolerance and accumulation. Here, transcriptomic profiling identified PyMTP10 as a critical metal tolerance protein gene that was activated by PyWRKY48 and that encodes a metal tolerance protein, and was strongly induced in PyWRKY48-OE poplar under Cd stress. RT-qPCR further confirmed that PyWRKY48 positively regulates PyMTP10 expression. Yeast one-hybrid, dual-luciferase reporter and electrophoretic mobility-shift assay experiments demonstrated that PyWRKY48 directly binds to the W-box cis-element in the promoter of PyMTP10 and activates its transcription. To investigate the function of PyMTP10, we generated PyMTP10-overexpressing and RNA interference transgenic poplar lines. Under Cd stress, PyMTP10 overexpression improved Cd tolerance, as evidenced by increased growth, chlorophyll content and antioxidant enzyme activities. PyMTP10 overexpression also increased Cd accumulation throughout plant tissues, concomitant with elevated levels of glutathione and phytochelatins. This study revealed that the PyWRKY48-PyMTP10 module coordinately regulates Cd tolerance and accumulation in poplar through the integration of transcriptional activation with enhanced chelation and sequestration. These findings expanded our understanding of Cd detoxification mechanisms in woody plants and provided molecular targets for improving phytoremediation efficiency in Cd-polluted soils.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148369624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Physiological characteristics and transcriptomic insights into rootstock-scion interactions in apple under cadmium stress. 镉胁迫下苹果砧木-接穗相互作用的生理特性及转录组学研究。
IF 4 2区 农林科学
Tree physiology Pub Date : 2026-08-01 DOI: 10.1093/treephys/tpag099
Jiale Wang, Sijun Qin, Deguo Lyu, Jiali He
{"title":"Physiological characteristics and transcriptomic insights into rootstock-scion interactions in apple under cadmium stress.","authors":"Jiale Wang, Sijun Qin, Deguo Lyu, Jiali He","doi":"10.1093/treephys/tpag099","DOIUrl":"10.1093/treephys/tpag099","url":null,"abstract":"<p><p>Cadmium (Cd) contamination of orchard soils threatens tree growth, fruit quality and food safety, and strategies are needed to limit Cd accumulation in apple. Grafting is widely used in apple production, but how rootstock-scion interactions regulate Cd uptake and detoxification remains unclear. This study aimed to elucidate the physiological and molecular mechanisms by which different apple graft combinations modulate Cd accumulation and tolerance. Four graft combinations comprising 'Hanfu' (HF) or 'Fuji' (FJ) scions grafted onto Malus baccata (L.) Borkh. (Mb) or Malus micromalus Borkh. (Mm) rootstocks, were grown in nutrient solution with or without 50 μM CdCl₂. Plant growth, Cd2+ influx, Cd accumulation and localization, antioxidant capacity, cell wall composition, and root and leaf transcriptomes were analyzed. Cadmium stress reduced biomass, root system development and photosystem II efficiency but generally increased non-enzymatic antioxidant capacity. The Mb rootstocks showed lower root net Cd2+ influx, lower Cd accumulation in roots and leaves, and weaker Cd signals in xylem than Mm, indicating a greater ability to restrict Cd uptake and transport. Across combinations, root cell walls were the major Cd sink, and Cd exposure increased pectin, hemicellulose and lignin contents. Transcriptome analyses revealed rootstock and scion specific Cd responses, with distinct enrichment of genes related to photosynthesis, oxidative stress and cell wall metabolism. These findings provide a physiological and molecular basis for selecting low-Cd apple graft combinations.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148473003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The secondary growth response of Pinus pinaster to induced strains demonstrates sensitivity to the full range of chronic winds. Pinus pinaster对诱导菌株的次生生长反应表现出对全范围慢性风的敏感性。
IF 4 2区 农林科学
Tree physiology Pub Date : 2026-08-01 DOI: 10.1093/treephys/tpag101
Alexandre Bosc, Barry Gardiner, Pauline Dèfossez
{"title":"The secondary growth response of Pinus pinaster to induced strains demonstrates sensitivity to the full range of chronic winds.","authors":"Alexandre Bosc, Barry Gardiner, Pauline Dèfossez","doi":"10.1093/treephys/tpag101","DOIUrl":"10.1093/treephys/tpag101","url":null,"abstract":"<p><p>Thigmomorphogenesis, the process by which plants acclimate to mechanical stress through growth modulation, significantly affects biomass allocation but remains underrepresented in integrative tree response models. Specifically, the contribution of chronic, non-injurious wind-induced strains to growth acclimation remains poorly quantified in natural environments. We characterized the secondary growth response to experimental strain stimulus in the stems of Pinus pinaster Ait. under forest conditions. Eighteen 12-year-old trees were subjected to transient bending treatments replicating the range of trunk strains generated by local chronic winds, while six trees served as controls. Radial growth was monitored continuously at three trunk positions. The thigmomorphogenetic response was quantified using growth-rate amplification and cumulative growth gain, then related to the estimated strain intensity at each position. Mechanical strain induced an immediate, sustained increase in radial growth along trunks. This stimulation persisted over extended periods, pausing only during drought or winter before resuming. Growth modulation scaled proportionally with strain intensity across the full natural range, with no detectable threshold. A consistent strain-response relationship was observed across all trunk positions, indicating spatially homogeneous sensitivity. These results demonstrate that secondary growth in P. pinaster is sensitive to the full spectrum of chronic wind-induced strains. This supports the view that non-injurious winds drive continuous mechanical acclimation contributes to a growth-mediated margin of safety in trees.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148563106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Radial branch hydraulics and cellular injury thresholds in poplar: insights from controlled dehydration and high-resolution dendrometry. 杨树的径向分支水力学和细胞损伤阈值:来自控制脱水和高分辨率树木测量的见解。
IF 4 2区 农林科学
Tree physiology Pub Date : 2026-08-01 DOI: 10.1093/treephys/tpag096
Tsiky Andriantelomanana, Aldo Borjas, Thierry Améglio, Hervé Cochard, Stéphane Herbette
{"title":"Radial branch hydraulics and cellular injury thresholds in poplar: insights from controlled dehydration and high-resolution dendrometry.","authors":"Tsiky Andriantelomanana, Aldo Borjas, Thierry Améglio, Hervé Cochard, Stéphane Herbette","doi":"10.1093/treephys/tpag096","DOIUrl":"10.1093/treephys/tpag096","url":null,"abstract":"<p><p>Branch water release and radial exchange influence drought responses. Although mechanistic models describe radial hydraulic and storage dynamics, experimental quantification of hydraulic capacitance (C) and radial resistance (Rr) across broad ranges of xylem water-potential (Ψx), particularly under severe dehydration, remains limited. We quantified how C and Rr vary with Ψx in Populus albaL., assessed the value of coupling controlled osmotic dehydration with high-resolution dendrometry, and evaluated cellular damage and bud viability across increasing dehydration levels. Branch segments were subjected to stepwise, experimentally induced dehydration by perfusion with D-sorbitol solutions (-1 to -4 MPa) to impose stable and controlled Ψx. Branch diameter dynamics and equilibration plateaus were used to estimate C and Rr, and diameter-derived pressure-volume curves were fitted using the Sureau model. Electrolyte leakage and bud development were monitored to assess injury and recovery capacity at the organ level. D-sorbitol equilibrated rapidly along the xylem with limited bark infiltration, and stepwise decreases in Ψx induced characteristic diameter contractions enabling robust extraction of C and Rr. Both traits varied with Ψx: C peaked at intermediate Ψx (-1 to -2 MPa) and declined under severe dehydration, while Rr increased steadily as Ψx decreased. Electrolyte leakage increased and buds failed to resume growth below -2 MPa. Controlled osmotic dehydration combined with high-resolution dendrometry enables precise quantification of C(Ψx) and Rr(Ψx) and reveals physiologically meaningful thresholds associated with cellular injury and loss of recovery capacity at the organ level, providing a useful framework for dehydration-tolerance phenotyping.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148430747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Drought-induced carbon reallocation in European beech: linking non-structural carbohydrates, xylem anatomy and water-use efficiency. 干旱诱导的欧洲山毛榉碳再分配:连接非结构性碳水化合物,木质部解剖结构和水分利用效率。
IF 4 2区 农林科学
Tree physiology Pub Date : 2026-08-01 DOI: 10.1093/treephys/tpag090
Guangqi Zhang, Pierre-Antoine Gaertner, Nathalie Bréda, Joseph Levillain, Gérard Bastien, Julien Ruelle, Catherine Massonnet
{"title":"Drought-induced carbon reallocation in European beech: linking non-structural carbohydrates, xylem anatomy and water-use efficiency.","authors":"Guangqi Zhang, Pierre-Antoine Gaertner, Nathalie Bréda, Joseph Levillain, Gérard Bastien, Julien Ruelle, Catherine Massonnet","doi":"10.1093/treephys/tpag090","DOIUrl":"10.1093/treephys/tpag090","url":null,"abstract":"<p><p>Understanding how trees balance carbon storage, hydraulic function and growth under drought is critical for predicting forest resilience to climate change. However, little is known about the interactive roles of non-structural carbohydrates (NSC), particularly starch and soluble sugars (SS), in coordination with wood anatomical traits and stable isotope signatures in mediating tree responses to drought stress. This study investigates the interplay between NSC, wood anatomical traits and intrinsic water-use efficiency (iWUE) in 56 European beech (Fagus sylvatica L.) trees from different crown conditions across drought and wet years in four sites in northeastern France with contrasted soil water deficit. We followed NSC (starch and SS) content in sapwood of trees each year and analyzed retrospectively tree ring width, vessel anatomy and stable isotopes (δ13C, δ18O). Results revealed that drought years significantly reduced starch content but increased SS, reflecting their role in osmotic regulation and metabolic demands. The SS to NSC ratio increased during drought, highlighting a dynamic carbon reallocation. Growth (tree basal area increment) declined in drought years, with starch accumulation in wetter years and SS prioritizing survival under stress. The SS to NSC ratio correlated positively with vessel density and theoretical specific xylem hydraulic conductivity (Kth), suggesting their involvement in hydraulic maintenance, while starch exhibited a negative relationship with Kth, indicating a trade-off between carbon storage and hydraulic efficiency. Elevated δ13C and iWUE during drought confirmed stomatal closure to conserve water, though at the cost of reduced carbon assimilation. δ18O correlated positively with SS, closely coupling carbohydrate dynamics to altered transpiration. These findings underscore how NSC dynamics, anatomical adjustments and isotopic signals collectively mediate drought responses, offering insights into carbon-water trade-offs in temperate forests.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148369565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
From roots to canopies: clonal size increases branch vulnerability to embolism and leaf water status in a sub-Mediterranean oak coppice. 从根到冠层:克隆大小增加分支对栓塞和叶水状态的脆弱性在亚地中海栎林。
IF 4 2区 农林科学
Tree physiology Pub Date : 2026-08-01 DOI: 10.1093/treephys/tpag074
Roberto L Salomón, Jesús Rodríguez-Calcerrada, María Valbuena-Carabaña, Álvaro Rubio-Cuadrado, Rosana López, Pilar Pita, Martin D Venturas, Cristina Molinero, José Carlos Miranda
{"title":"From roots to canopies: clonal size increases branch vulnerability to embolism and leaf water status in a sub-Mediterranean oak coppice.","authors":"Roberto L Salomón, Jesús Rodríguez-Calcerrada, María Valbuena-Carabaña, Álvaro Rubio-Cuadrado, Rosana López, Pilar Pita, Martin D Venturas, Cristina Molinero, José Carlos Miranda","doi":"10.1093/treephys/tpag074","DOIUrl":"10.1093/treephys/tpag074","url":null,"abstract":"<p><p>Climatic and socioeconomic changes are driving widespread tree decline in abandoned Mediterranean coppices, a process potentially modulated by their clonal structure. However, the influence of belowground clonal size on aboveground physiological performance in resprouting species remains unknown. We integrated genetic, physiological and dendrochronological approaches within a one-hectare experimental plot of Quercus pyrenaica Willd. to test the effect of clonal size on shoot vigour and physiological performance. We studied 48 vigorous and decaying shoots from 24 size-contrasted clones, characterized by clonal area, shoot number, cumulative basal and sapwood area, and leaf area index. During the prolonged 2022 summer drought, we monitored leaf water potential, water content and gas exchange across seven measurement campaigns. These measurements were complemented with analyses of leaf pressure-volume traits, leaf minimum conductance, branch vulnerability to embolism, stem non-structural carbohydrates and long-term stem radial growth. Vigorous and declining shoots did not differ in monitored leaf-level variables or leaf hydraulic traits. However, declining canopy vigour was reflected in decadal stem growth stagnation and reduced stem xylem soluble sugars after leaf flush. Increasingly negative leaf water potential during the dry season limited long-term stem growth, more markedly for declining shoots. Both leaf hydration during summer drought and leaf area per unit sapwood area increased with clonal size. Concurrently, large clones exhibited higher branch vulnerability to embolism, with no differences in leaf osmoregulatory capacity. Our findings suggest that, in this coppiced clonal system, (i) stem-level measurements better captured differences between vigorous and declining shoots than leaf-level measurements, likely due to non-uniform branch dieback, (ii) single-time-point physiological measurements can provide insight into long-term growth trends and (iii) centennial coppicing has driven clonal-size-dependent allometric adjustments that favour root water uptake while increasing embolism vulnerability. Clonal structure and size are therefore overlooked factors that should be integrated into management strategies for these ecosystems.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148139055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of fertilization on drought responses in saplings of three European trees species. 施肥对三种欧洲树种树苗干旱响应的影响。
IF 4 2区 农林科学
Tree physiology Pub Date : 2026-08-01 DOI: 10.1093/treephys/tpag089
Feng Feng, Adriano Losso, Barbara Beikircher, Andrea Ganthaler, Melvin Tyree, Stefan Mayr
{"title":"Effects of fertilization on drought responses in saplings of three European trees species.","authors":"Feng Feng, Adriano Losso, Barbara Beikircher, Andrea Ganthaler, Melvin Tyree, Stefan Mayr","doi":"10.1093/treephys/tpag089","DOIUrl":"10.1093/treephys/tpag089","url":null,"abstract":"<p><p>Nutrient and water supply are decisive limiting factors for trees and their productivity. Yet, the consequences of fertilization for drought responses, especially during the sensitive nursery stage, remain poorly understood. In this study, we exposed potted saplings of Pinus sylvestris L., Fagus sylvatica L. and Quercus robur L. to two levels of fertilization and three water regimes. The effects of fertilization, drought and their interaction on gas exchange, hydraulic traits and growth were examined. Fertilization generally promoted gas exchange, hydraulic conductance and biomass accumulation but responses were species-specific and did not always persist under and after drought. While fertilized Q. robur maintained or even increased its biomass and physiological performance under drought, the benefits of fertilization for P. sylvestris and F. sylvatica diminished under increasing drought intensity. No consistent changes in drought resistance traits (e.g., turgor loss point, embolism resistance) were observed across species in response to fertilization, which may indicate limited plasticity or acclimation potential of saplings. Our findings highlight the species-specific fertilization effects on drought responses and post-drought performance of saplings, emphasizing the need to consider both factors in silvicultural practices under future climate scenarios.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13445981/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148353615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Systematic Review of Remote Sensing Techniques for Monitoring Pests and Diseases in Tree Crops. 林木病虫害遥感监测技术的系统综述。
IF 4 2区 农林科学
Tree physiology Pub Date : 2026-07-13 DOI: 10.1093/treephys/tpag097
Matthew Abutunghe Abutunghe, Booker Ogutu, Jadu Dash
{"title":"A Systematic Review of Remote Sensing Techniques for Monitoring Pests and Diseases in Tree Crops.","authors":"Matthew Abutunghe Abutunghe, Booker Ogutu, Jadu Dash","doi":"10.1093/treephys/tpag097","DOIUrl":"10.1093/treephys/tpag097","url":null,"abstract":"<p><p>Tree crops are essential agroecosystems that contribute to global food security and economic development by providing a variety of fruits, nuts, and other edible products. However, the sustained production of these crops is increasingly threatened by pest and disease (P&D) pressure. Remote sensing (RS) techniques provide non-invasive, scalable tools for monitoring the physiological responses of crops to biotic stressors and for integrated P&D management frameworks. Despite their increased use in recent decades, there remains limited clarity regarding the frameworks, parameters, and spectral variables used to assess tree crop health. This is because earlier reviews focused primarily on food crops and forest trees, paying little attention to tree crops. To fill this gap, we conducted the first systematic review of the peer-reviewed literature to evaluate the scope, opportunities, and methodological approaches for RS applications across a wide spectrum of tree crops. Our findings show that research using RS techniques in tree crop health monitoring has grown consistently since 1974, with studies focusing on citrus, oil palm, olives, and rubber trees accounting for more than half of the reviewed literature (52.73%). Spectral indices derived from both hyperspectral and multispectral data, analysed using machine learning and statistical models, were the dominant approach for monitoring P&D dynamics in tree crops. Geographically, most studies have been concentrated in North America and Eurasia, with limited application in tropical tree crops. Extending the use of RS techniques to economically important tropical tree crops will not only support adaptive responses to biotic threats but also improve yields and sustainability across tree-crop systems worldwide.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148430153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Considerable variation in embolism resistance in a temperate forest driven by anatomy. 在温带森林中,由解剖学驱动的抗栓塞性的相当大的变化。
IF 4 2区 农林科学
Tree physiology Pub Date : 2026-07-01 DOI: 10.1093/treephys/tpag071
Ian M Rimer, Cade N Kane, Dongsheng Yan, Indira Paudel, Jeffrey S Dukes, Scott A M McAdam
{"title":"Considerable variation in embolism resistance in a temperate forest driven by anatomy.","authors":"Ian M Rimer, Cade N Kane, Dongsheng Yan, Indira Paudel, Jeffrey S Dukes, Scott A M McAdam","doi":"10.1093/treephys/tpag071","DOIUrl":"10.1093/treephys/tpag071","url":null,"abstract":"<p><p>Embolism resistance is a key trait that determines plant survival during drought. While much attention has been directed toward understanding embolism resistance within individual species, researchers have rarely assessed the variation in this trait within a plant community. Here, using the optical method, we investigated stem and leaf embolism resistance in 14 deciduous tree species native to the central hardwood forest of North America. We sought to test whether vulnerability segmentation between leaves and stems was common in this plant community and to determine if key anatomical traits correlated with embolism resistance. We compared these results with published datasets that report significant correlations between embolism resistance and anatomy in other similar communities. We found considerable variation in embolism resistance and anatomy across the species in this community, with minimal vulnerability segmentation between leaf and stem. In contrast to previous studies, ring-porous species were significantly more embolism resistant than diffuse-porous species and had larger stomatal safety margins. Across species, P50 was best predicted by xylem connectivity and the xylem to leaf area ratio, whereas vessel diameter and lumen fraction showed no relationship with P50. Across all species, stomatal safety margin was strongly correlated with leaf P50, whereas turgor loss point showed minimal variation across species. A broad variation in embolism resistance, correlated with xylem anatomy, suggests the potential for P50 to drive localized ecological differentiation within communities.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148043875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Response of two mangrove species to elevated temperatures: a comparative study on photosynthetic physiological sensitivity and acclimation to simulated climate warming. 两种红树林对高温的响应:光合生理敏感性和适应模拟气候变暖的比较研究。
IF 4 2区 农林科学
Tree physiology Pub Date : 2026-07-01 DOI: 10.1093/treephys/tpag072
Jiajia Wu, Zhongtang Wang, Shunyang Chen, Jiahui Chen, Guangcheng Chen, Yong Ye
{"title":"Response of two mangrove species to elevated temperatures: a comparative study on photosynthetic physiological sensitivity and acclimation to simulated climate warming.","authors":"Jiajia Wu, Zhongtang Wang, Shunyang Chen, Jiahui Chen, Guangcheng Chen, Yong Ye","doi":"10.1093/treephys/tpag072","DOIUrl":"10.1093/treephys/tpag072","url":null,"abstract":"<p><p>As global warming intensifies, understanding the physiological and ecological responses of mangrove species to rising temperatures becomes crucial for predicting their future distribution and resilience. This study investigated the photosynthetic physiology, growth and biomass allocation of seedlings of two mangrove species, Kandelia obovata and Bruguiera gymnorrhiza, under controlled temperature gradients of 22-32 °C, simulating Intergovernmental Panel on Climate Change (IPCC) projected warming scenarios. Key findings include a unimodal response of net photosynthesis to temperature, with species-specific optimal temperatures: K. obovata achieved its maximum net photosynthetic rate (9.25 ± 0.13 μmol m-2 s-1) at 30 °C, while B. gymnorrhiza peaked at 28 °C (7.44 ± 0.17 μmol m-2 s-1) and maintained a plateau at 30 °C. The maximum quantum efficiency of photosystem II increased by 33.87% in K. obovata at 30 °C and by 32.20% in B. gymnorrhiza at 32 °C relative to 22 °C. Warming significantly enhanced biomass accumulation in K. obovata, with total dry biomass increasing by 63.83% at 32 °C compared with 22 °C, while B. gymnorrhiza showed a 25.6% increase at 28 °C. The study highlights species-specific acclimation: K. obovata exhibits higher photosynthetic efficiency and biomass allocation plasticity, whereas B. gymnorrhiza demonstrates greater photoprotection and water-use efficiency. The strategies suggest that K. obovata may thrive under increased water availability, whereas conservative traits could enhance resilience to drought and heat stress for B. gymnorrhiza. These findings reveal a fundamental trade-off between growth and photosynthetic efficiency under warming. This mechanistic insight into mangrove acclimation improves our ability to forecast their responses to climate change and supports the development of targeted conservation strategies.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148151459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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