Tree physiology最新文献

{"title":"Do trees use stemflow water? A manipulative experiment on Singleleaf piñon and Utah juniper in Great Basin woodlands.","authors":"Keirith A Snyder, Amira C Morrow, Tamzen K Stringham, Scott T Allen","doi":"10.1093/treephys/tpae143","DOIUrl":"10.1093/treephys/tpae143","url":null,"abstract":"<p><p>It has been postulated that stemflow, precipitation that flows from plant crowns down along branches and stems to soils, benefits plants that generate it because it increases plant-available soil water near the base of the plant; however, little direct evidence supports this postulation. Were plants' crowns to preferentially route water to their roots, woody plants with large canopies could benefit. For example, piñon and juniper tree encroachment into sagebrush steppe ecosystems could be facilitated by intercepted precipitation routed to tree roots as stemflow, hypothetically reducing water available for shrubs and grasses. We tested whether Great Basin piñon and juniper trees use and benefit from stemflow. In a drier-than-average and wetter-than-average water year, isotopically labeled water was applied to tree stems to simulate stemflow. Both species took up stemflow, with label signals peaking and receding over 2-4 days. Despite this uptake, no alleviation of water stress was detected in the drier year. The stemflow uptake resulted in some water stress alleviation in the wetter year, specifically for piñons, which took up water from deeper in the soil profile than did junipers. Mixing model analyses suggested that stemflow was a small fraction of the water in stems (⁓0-2%), but an order-of-magnitude larger fraction of the stemflow was transpired in those few days after addition. These findings represent a novel demonstration of the rapid uptake and use of stemflow that infiltrates the rhizosphere, but they also prompt questions about the remaining stemflow's fate and why alleviation of water stress was so minor.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142839478","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}

{"title":"Integrated analysis of miRNA-mRNA regulatory networks in Anoectochilus roxburghii in response to blue laser light.","authors":"Hansheng Li, Chunzhen Cheng, Mulan Chen, Yuqing Li, Jinkun Li, Wei Ye, Gang Sun","doi":"10.1093/treephys/tpae144","DOIUrl":"10.1093/treephys/tpae144","url":null,"abstract":"<p><p>Anoectochilus roxburghii (Wall.) Lind. has significant medicinal and economic value, and the social demand for this species is increasing annually. Laser light sources have different luminescent mechanisms compared with ordinary light sources and are also important factors regulating the synthesis of functional metabolites in A. roxburghii. However, the regulatory mechanism through which A. roxburghii responds to blue laser light has not been investigated. Previous studies have shown that blue-laser treatment results in more red leaves than blue- or white-light treatment. Here, the differences in the effects of laser treatment on A. roxburghii were analyzed by transcriptome sequencing. Gene Ontology analysis revealed that the membranes, calcium ion binding, brassinosteroid-mediated signaling pathway and response to salicylic acid play important roles in the response of A. roxburghii to blue laser light. Kyoto Encyclopedia of Genes and Genomes analysis revealed the involvement of multiple pathways in the response to blue-laser treatment, and among these, beta biosynthesis, flavone and flavonol biosynthesis, thiamine metabolism, limonene and pinene biosynthesis, and peroxisomes play core roles. Cytoscape interaction analysis of the differentially expressed miRNA targets indicated that novel_miR_66, novel_miR_78 and novel_miR_212 were most likely involved in the effect of blue laser light on A. roxburghii. Metabolic content measurements showed that blue laser light increased the beet red pigment, thiamine, total flavonoid and limonene contents, and qPCR analysis confirmed that novel_miR_21, novel_miR_66, novel_miR_188 and novel_miR_194 might participate in the blue-laser signaling network through their target genes and thereby regulate the functional metabolite accumulation in A. roxburghii. This study provides a scientific basis for high-yield A. roxburghii production.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142839396","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}

{"title":"CsCBF2 contributes to cold repression of chlorophyll and carotenoid biosynthesis in albino Camellia sinensis cv. Baiye 1.","authors":"Xin Cheng, Ying Sun, Yijia Wang, Xuyang Liu, Jingjie Cao, Dandan Li, Dan Yang, Chao Zhuo, Xiaochun Wan, Linlin Liu","doi":"10.1093/treephys/tpae149","DOIUrl":"10.1093/treephys/tpae149","url":null,"abstract":"<p><p>C-repeat binding factors (CsCBFs) play a pivotal role in regulating cold response in higher plants. Camellia sinensis cv. Baiye 1, a representative albino tea cultivar, has been identified as temperature-sensitive based on long-term observations by tea farmers. However, it remains unclear whether CsCBFs are involved in temperature-mediated albinism and seasonal greening in 'Baiye 1', and the mechanisms by which CBFs regulate cold responses in albino leaves are unknown. In this study, we demonstrate that CsCBF2 suppresses the seasonal greening of albino leaves by inhibiting chlorophyll and carotenoid biosynthesis under cold stress. In tea plantations, the accumulation of chlorophylls and carotenoids in the albino shoots of 'Baiye 1' is closely correlated with the effective accumulated temperature during its seasonal greening process. Weighted Gene Co-expression Network Analysis revealed negative associations between CsCBF expression and chlorophylls, carotenoids, as well as their biosynthetic genes REVEILLE 1 (CsRVE1) and Zeaxanthin epoxidase 1 (CsZEP1) under temperature fluctuations during seasonal greening. Cold-induced upregulation of CsCBF2 expression and decreased chlorophyll and carotenoids under controlled climate conditions. Transient suppression of CsCBF2 by antisense oligodeoxynucleotides elevated expressions of target genes and increased chlorophylls and carotenoids. CBF-binding cis-elements were identified in CsRVE1, Protochlorophyllide oxidoreductase A (CsPORA) and CsZEP1 promoters. Luciferase assays suggested CsCBF2 binding to the CRT/DRE cis-elements and repressing expression of CsRVE1, CsPORA and CsZEP1. These findings highlight CsCBF2 as a key transcriptional repressor involved in the seasonal greening of albino 'Baiye 1' under cold stress by modulating cold responses and inhibiting genes associated with chlorophyll and carotenoid biosynthesis.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142682768","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}

{"title":"Bark water vapor conductance varies among temperate forest tree species and is affected by flooding and stem bending.","authors":"Yinuo Zhou, Grace Rosseau, Viet Dao, Brett T Wolfe","doi":"10.1093/treephys/tpae156","DOIUrl":"https://doi.org/10.1093/treephys/tpae156","url":null,"abstract":"<p><p>Bark water vapor conductance (gbark) modulates forest transpiration during droughts, when leaf transpiration is highly reduced. If disturbances such as windstorms and floods impact gbark, they could affect tree performance during subsequent droughts. Bark traits, particularly lenticel traits, likely drive variation in gbark and may influence the effects of disturbances on gbark. We assessed variation in gbark and bark traits in tree branches of 15 tree species in a temperate forest in Louisiana, USA, and performed experiments to test whether gbark in tree branches was affected by bending (simulating wind) and whether gbark of tree saplings was affected by soil flooding. Among tree species, mean branch gbark ranged from 2.22 to 12.02 mmol m-2 s-1. Stem bending increased gbark by 23% compared to unbent controls. Although gbark was unaffected by 38 days of flooding, after 69 days post-flood it was reduced by 41% compared to unflooded controls. The relationships between gbark and bark traits, including bark thickness, lenticel density, and lenticel size, were inconsistent across the survey and experiments. Together, these results show that gbark is variable among species and mutable. Uncovering the drivers of gbark variation within and among trees, including exposure to extreme weather events, will inform projections of forest dynamics under climate change.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142808049","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}

{"title":"Initial stomatal conductance increases photosynthetic induction of trees leaves more from sunlit than from shaded environments: a meta-analysis.","authors":"Huixing Kang, Yuan Yu, Xinran Ke, Hajime Tomimatsu, Dongliang Xiong, Louis Santiago, Qingmin Han, Reki Kardiman, Yanhong Tang","doi":"10.1093/treephys/tpae128","DOIUrl":"10.1093/treephys/tpae128","url":null,"abstract":"<p><p>It has long been held that tree species/leaves from shaded environments show faster rate of photosynthetic induction than species/leaves from sunlit environments, but the evidence so far is conflicting and the underlying mechanisms are still under debate. To address the debate, we compiled a dataset for 87 tree species and compared the initial increasing slope during the first 2-min induction (SA) and stomatal and biochemical characteristics between sun and shade species from the same study, and those between sun and shade leaves within the same species. In 77% of between-species comparisons, the species with high steady-state photosynthetic rate in the high light (Af) exhibited a larger SA than the species with low Af. In 67% within-species comparisons, the sun leaves exhibited a larger SA than the shade leaves. However, in only a few instances did the sun species/leaves more rapidly achieve 50% of full induction, with an even smaller SA, than the shade species/leaves. At both the species and leaf level, SA increased with increasing initial stomatal conductance before induction (gsi). Despite exhibiting reduced intrinsic water-use efficiency in low light, a large SA proportionally enhances photosynthetic carbon gain during the first 2-min induction in the sun species and leaves. Thus, in terms of the increase in absolute rate of photosynthesis, tree species/leaves from sunlit environments display faster photosynthetic induction responses than those from shaded environments. Our results call for re-consideration of contrasting photosynthetic strategies in photosynthetic adaption/acclimation to dynamic light environments across species.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142372959","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}

{"title":"Isotopic steady state or non-steady state transpiration? Insights from whole-tree chambers.","authors":"Richard Harwood, Lucas A Cernusak, John E Drake, Craig V M Barton, Mark G Tjoelker, Margaret M Barbour","doi":"10.1093/treephys/tpae125","DOIUrl":"10.1093/treephys/tpae125","url":null,"abstract":"<p><p>Unravelling the complexities of transpiration can be assisted by understanding the oxygen isotope composition of transpired water vapour (δE). It is often assumed that δE is at steady state, thereby mirroring the oxygen isotope composition of source water (δsource), but this assumption has never been tested at the whole-tree scale. This study utilized the unique infrastructure of 12 whole-tree chambers enclosing Eucalyptus parramattensis E.C.Hall trees to measure δE along with concurrent temperature and gas exchange data. Six chambers tracked ambient air temperature and six were exposed to an ambient +3 °C warming treatment. Day time means for δE were within 1.2‰ of δsource (-3.3‰) but varied considerably throughout the day. Our observations show that E. parramattensis trees are seldom transpiring at isotopic steady state over a diel period, but transpiration approaches source water isotopic composition over longer time periods.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11555434/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142376093","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}

{"title":"Distribution and characterization of endophytic and rhizosphere bacteriome of below-ground tissues in Chinese fir plantation.","authors":"Kai Wang, Qingao Wang, Liang Hong, Yuxin Liu, Jiyun Yang, Fred O Asiegbu, Pengfei Wu, Lin Huang, Xiangqing Ma","doi":"10.1093/treephys/tpae137","DOIUrl":"10.1093/treephys/tpae137","url":null,"abstract":"<p><p>Plantations of Chinese fir, a popular woody tree species, face sustainable issues, such as nutrient deficiency and increasing disease threat. Rhizosphere and endophytic bacteria play important roles in plants' nutrient absorption and stress alleviation. Our understanding of the microbiome structure and functions is proceeding rapidly in model plants and some crop species. Yet, the spatial distribution and functional patterns of the bacteriome for the woody trees remain largely unexplored. In this study, we collected rhizosphere soil, non-rhizosphere soil, fine root, thick root and primary root samples of Chinese fir and investigated the structure and distribution of bacteriome, as well as the beneficial effects of endophytic bacterial isolates. We discovered that Burkholderia and Paraburkholderia genera were overwhelmingly enriched in rhizosphere soil, and the abundance of Pseudomonas genus was significantly enhanced in fine root. By isolating and testing the nutrient absorption and pathogen antagonism functions of representative endophytic bacteria species in Pseudomonas and Burkholderia, we noticed that phosphorus-solubilizing functional isolates were enriched in fine root, while pathogen antagonism isolates were enriched in thick root. As a conclusion, our study revealed that the endophytic and rhizosphere environments of Chinese fir hold distinct structure and abundance of bacteriomes, with potential specific functional enrichment of some bacterial clades. These findings assist us to further study the potential regulation mechanism of endophytic functional bacteria by the host tree, which will contribute to beneficial microbe application in forestry plantations and sustainable development.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142475657","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}

{"title":"Monitoring weekly δ13C variations along the cambium-xylem continuum in the Canadian eastern boreal forest.","authors":"Sepideh Namvar, Étienne Boucher, Annie Deslauriers, Hubert Morin, Martine M Savard","doi":"10.1093/treephys/tpae136","DOIUrl":"10.1093/treephys/tpae136","url":null,"abstract":"<p><p>Intra-annual variations of carbon stable isotope ratios (δ13C) in different tree compartments could represent valuable indicators of plant carbon source-sink dynamics, at weekly time scale. Despite this significance, the absence of a methodological framework for tracking δ13C values in tree rings persists due to the complexity of tree ring development. To fill this knowledge gap, we developed a method to monitor weekly variability of δ13C in the cambium-xylem continuum of black spruce species [Picea mariana (Mill.) BSP.] during the growing season. We collected and isolated the weekly incremental growth of the cambial region and the developing tree ring from five mature spruce trees over three consecutive growing seasons (2019-21) in Simoncouche and two growing seasons (2020-21) in Bernatchez, both located in the boreal forest of Quebec, Canada. Our method allowed for the creation of intra-annual δ13C series for both the growing cambium (δ13Ccam) and developing xylem cellulose (δ13Cxc) in these two sites. Strong positive correlations were observed between δ13Ccam and δ13Cxc series in almost all study years. These findings suggest that a constant supply of fresh assimilates to the cambium-xylem continuum may be the dominant process feeding secondary growth in the two study sites. On the other hand, rates of carbon isotopic fractionation appeared to be poorly affected by climate variability, at an inter-weekly time scale. Hence, increasing δ13Ccam and δ13Cxc trends highlighted here possibly indicate shifts in carbon allocation strategies, likely fostering frost resistance and reducing water uptake in the late growth season. Additionally, these trends may be related to the black spruce trees' responses to the seasonal decrease in photosynthetically active radiation. Our findings provide new insights into the seasonal carbon dynamics and growth constraints of black spruce in boreal forest ecosystems, offering a novel methodological approach for studying carbon allocation at fine temporal scales.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11585013/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142475661","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}

{"title":"Photosynthetic temperature responses in leaves and canopies: why temperature optima may disagree at different scales.","authors":"Dushan P Kumarathunge, Belinda E Medlyn, John E Drake, Martin G De Kauwe, Mark G Tjoelker, Michael J Aspinwall, Craig V M Barton, Courtney E Campany, Kristine Y Crous, Jinyan Yang, Mingkai Jiang","doi":"10.1093/treephys/tpae135","DOIUrl":"10.1093/treephys/tpae135","url":null,"abstract":"<p><p>Understanding how canopy-scale photosynthesis responds to temperature is of paramount importance for realistic prediction of the likely impact of climate change on forest growth. The effects of temperature on leaf-scale photosynthesis have been extensively documented but data demonstrating the temperature response of canopy-scale photosynthesis are relatively rare, and the mechanisms that determine the response are not well quantified. Here, we compared leaf- and canopy-scale photosynthesis responses to temperature measured in a whole-tree chamber experiment and tested mechanisms that could explain the difference between leaf and crown scale temperature optima for photosynthesis. We hypothesized that (i) there is a large contribution of non-light saturated leaves to total crown photosynthesis, (ii) photosynthetic component processes vary vertically through the canopy following the gradient in incident light and (iii) seasonal temperature acclimation of photosynthetic biochemistry has a significant role in determining the overall temperature response of canopy photosynthesis. We tested these hypotheses using three models of canopy radiation interception and photosynthesis parameterized with leaf-level physiological data and estimates of canopy leaf area. Our results identified the influence of non-light saturated leaves as a key determinant of the lower temperature optimum of canopy photosynthesis, which reduced the temperature optimum of canopy photosynthesis by 6-8 °C compared with the leaf scale. Further, we demonstrate the importance of accounting for within-canopy variation and seasonal temperature acclimation of photosynthetic biochemistry in determining the magnitude of canopy photosynthesis. Overall, our study identifies key processes that need to be incorporated in terrestrial biosphere models to accurately predict temperature responses of whole-tree photosynthesis.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11585359/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142475671","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}

{"title":"Variance and variability in tree physiology.","authors":"Maurizio Mencuccini","doi":"10.1093/treephys/tpae147","DOIUrl":"10.1093/treephys/tpae147","url":null,"abstract":"","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142628970","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}