Tree physiology最新文献

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Moderately and severely defoliated Quercus ilex L. trees exhibit hydraulic dysfunction and carbon depletion: physiological implications for Mediterranean forest monitoring. 中度和重度落叶栎树表现出水力功能障碍和碳消耗:地中海森林监测的生理意义。
IF 3.5 2区 农林科学
Tree physiology Pub Date : 2025-03-26 DOI: 10.1093/treephys/tpaf033
Francesca Alderotti, Filippo Bussotti, Antonella Gori, Francesco Ferrini, Mauro Centritto, Martina Pollastrini, Cassandra Detti, Ermes Lo Piccolo, Diana Vanacore, Cecilia Brunetti
{"title":"Moderately and severely defoliated Quercus ilex L. trees exhibit hydraulic dysfunction and carbon depletion: physiological implications for Mediterranean forest monitoring.","authors":"Francesca Alderotti, Filippo Bussotti, Antonella Gori, Francesco Ferrini, Mauro Centritto, Martina Pollastrini, Cassandra Detti, Ermes Lo Piccolo, Diana Vanacore, Cecilia Brunetti","doi":"10.1093/treephys/tpaf033","DOIUrl":"https://doi.org/10.1093/treephys/tpaf033","url":null,"abstract":"<p><p>The increase in drought occurrence and intensity is contributing to rising rates of Quercus ilex L. (holm oak) mortality. Key physiological traits involved include hydraulic dysfunction and carbohydrate depletion. This study monitored xylem embolism and non-structural carbohydrates (NSCs) availability in adult holm oaks under harsh environmental conditions to identify thresholds of physiological impairment associated with increased mortality risk. Seasonal measurements of percentage loss of hydraulic conductivity (PLC), xylem water potential (Ψx) and NSCs were conducted over two years in trees categorized by defoliation severity: non-defoliated (CL1), moderately defoliated (CL2) and severely defoliated (CL3). Increased crown defoliation correlated with higher PLC and reduced NSC availability, with significant differences observed primarily in summer and autumn. Xylem embolism and carbon uptake (inferred from NSC content) showed asynchronous patterns across seasons. In summer and autumn, CL2 and CL3 trees experienced 40-50% PLC, coinciding with reduced carbon uptake. Over the two years, the physiology of CL2 trees deteriorated to a similar level to that of CL3 trees. PLC remained stable in non-defoliated CL1 trees, while decreased seasonally in CL2 and CL3 trees during winter and spring. Interestingly, CL2 and CL3 trees showed delayed starch reserve recovery, which occurred in winter rather than autumn, as observed in CL1 trees. This delayed recovery suggests the absence of autumn NSC replenishment as a potential early warning sign of physiological impairment leading to holm oak decline. Our findings suggest that moderate crown defoliation may conceal severe physiological damage, leading to PLC, Ψx and NSC values comparable to those of severely defoliated trees in later stages.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143721604","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
Osmoregulation is a crucial factor for methyl jasmonate to enhance chilling tolerance of Jatropha curcas L. 渗透调节是茉莉酸甲酯增强麻疯树抗寒性的关键因素。
IF 3.5 2区 农林科学
Tree physiology Pub Date : 2025-03-26 DOI: 10.1093/treephys/tpaf037
Shanshan Lan, Ming Gong, Shuanglong Yang
{"title":"Osmoregulation is a crucial factor for methyl jasmonate to enhance chilling tolerance of Jatropha curcas L.","authors":"Shanshan Lan, Ming Gong, Shuanglong Yang","doi":"10.1093/treephys/tpaf037","DOIUrl":"https://doi.org/10.1093/treephys/tpaf037","url":null,"abstract":"<p><p>Methyl jasmonate (MeJA) is a vital regulator of plant growth and plays a crucial role in chilling tolerance. However, the mechanism through which MeJA enhances chilling tolerance in plants remains unclear. Therefore, this study conducted hydroponic experiments to evaluate the effects of exogenous MeJA (0-125 μmol·L-1) on osmoregulation and chilling tolerance of Jatropha curcas seedlings under chilling (5 °C) stress. The seedlings under chilling stress were treated with MeJA and morphological changes, physiological traits, osmoprotectants (proline, betaine, and trehalose) contents, activities of key enzymes involved in osmoprotectants metabolism, and expression of related genes were investigated. The results showed that treatment with 75 μmol·L-1 MeJA alleviated leaf wilting and growth inhibition; significantly decreased water potential, electrolyte leakage, and malondialdehyde content; and enhanced tissue vitality, water content, total chlorophyll content, net photosynthetic rate, stomatal conductance, intercellular CO₂ concentration, and transpiration rate in J. curcas seedlings, thereby improving chilling tolerance. Under chilling stress, four days of MeJA treatment remarkably increased the contents of proline, betaine, and trehalose in the leaves of J. curcas seedlings by activating their biosynthesis pathways and inhibiting the degradation pathway of proline. The substantial accumulation of osmoprotectants reduced the cellular water potential, maintained the cellular water balance, and stabilized the cell membrane. Furthermore, 1-4 d of MeJA treatment led to increased levels of jasmonic acid (JA) and ethylene and upregulation of JcMYC2 expression in J. curcas seedlings under chilling stress. This suggested that the JA/MeJA-MYC2 signaling pathway, along with ethylene signaling, may contribute to MeJA-induced chilling tolerance in J. curcas. Our findings suggested that exogenous MeJA treatment increases the capacity for osmoregulation and chilling tolerance in J. curcas seedlings under chilling stress and that osmoregulation is a crucial component of MeJA-induced chilling tolerance.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143721607","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 Symptoms Induced by Drought Stress Outweigh Vascular Pathogen Infection in Walnut. 干旱胁迫诱导的核桃生理症状大于血管病原菌感染。
IF 3.5 2区 农林科学
Tree physiology Pub Date : 2025-03-26 DOI: 10.1093/treephys/tpaf034
Israel Jiménez Luna, Louis Santiago, Exequiel Ezcurra, MengYuan Xi, Vanessa E T M Ashworth, Eugene Nothnagel, Philippe E Rolshausen
{"title":"Physiological Symptoms Induced by Drought Stress Outweigh Vascular Pathogen Infection in Walnut.","authors":"Israel Jiménez Luna, Louis Santiago, Exequiel Ezcurra, MengYuan Xi, Vanessa E T M Ashworth, Eugene Nothnagel, Philippe E Rolshausen","doi":"10.1093/treephys/tpaf034","DOIUrl":"https://doi.org/10.1093/treephys/tpaf034","url":null,"abstract":"<p><p>Drought stress can affect the success of xylem-dwelling pathogens due to modifications of the xylem environment as water potential declines. However, the interaction between these abiotic and biotic stresses on plants is complex and requires specific experiments to distinguish between multiple effects. This is especially important in agroecosystems, where monocultures of individuals facilitate disease transmission and water scarcity can lead to deficit irrigation practices to optimize water management, control canopy size, and maintain crop productivity. We measured photosynthetic gas exchange, stem xylem water potential, non-structural carbohydrates (NSC), morphology, and growth, of walnut trees in response to two imposed stress treatments. One was inoculation with the two cosmopolitan vascular fungal pathogens Diplodia mutila and Neofusicoccum parvum. The other was a manipulation of water availability with well-watered controls compared to deficit irrigation treatments representing 75% and 25% of well-watered controls. We found that deficit irrigation significantly reduced all measures of gas exchange and stem xylem water potential, and most morphological, growth, and NSC variables. Signs of severe drought with leaf yellowing and senescing occurred at the end of the experiment when leaf water potential reached -1.6 MPa. In contrast, responses to pathogen inoculation were limited to reduced stem xylem water potential, total plant leaf area, and leaf area ratio. There was no reduction in photosynthetic rate per leaf area with pathogen inoculation, but the reduction in whole plant leaf area led to an overall reduction in whole plant photosynthesis. Pathogen-induced effects were independent of the plant water status, yet they were only visible in fully irrigated trees suggesting that drought minimizes the scope of measurable symptoms. Biotic damage was not enhanced under drought stress perhaps indicating that the host had not reached a critical water stress status conducive to pathogen virulence.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143721623","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
Water use strategies in pines and oaks across biomes are modulated by soil water availability. 松木和栎树的水分利用策略受到土壤水分有效性的调节。
IF 3.5 2区 农林科学
Tree physiology Pub Date : 2025-03-16 DOI: 10.1093/treephys/tpaf031
Mehmet S Özçelik, Rafael Poyatos
{"title":"Water use strategies in pines and oaks across biomes are modulated by soil water availability.","authors":"Mehmet S Özçelik, Rafael Poyatos","doi":"10.1093/treephys/tpaf031","DOIUrl":"https://doi.org/10.1093/treephys/tpaf031","url":null,"abstract":"<p><p>Quercus and Pinus are amongst the most economically and ecologically relevant genera of woody species across northern hemisphere forests. Mixed pine-oak woodlands are also abundant in temperate and Mediterranean regions. The recent shift towards dominance of oaks in detriment of pines, reported in several regions, could be partly driven by differential drought responses between genera and associated with climate change. Here, we synthesise water use strategies across pine and oak species globally to elucidate whether water-saver and water-spender strategies are consistently found for pines and oak species, respectively, and to what extent these strategies are determined by species traits and site characteristics. Pines showed a water-saver strategy when soils are dry but a comparatively water-spender strategy when soils are wet. These patterns still hold when pines and oaks grow in the same site, and thus are not affected by species interactions between them. Oak species have higher stem hydraulic conductivity and a deeper maximum rooting depth, supporting their higher capacity to withdraw soil water. Water use regulation was more related to traits in pines, showing more water-spender strategies at low absolute values of predawn leaf water potentials, without necessarily increasing hydraulic risk, as a result of adjustments in sapwood-to-leaf area ratio (Huber value) and xylem hydraulic conductivity. Climate and vegetation structure were more related to water use strategies in pines compared to oaks. Our results show that, despite these trait adjustments, drought severely constrains water (and carbon) acquisition in pines, which would tend to favour oak species in drought-prone environments.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143634723","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
Integrated transcriptomic and metabolomic analyses reveal regulatory networks governing hub metabolic pathways in Fraxinus hupehensis seeds during germination. 综合转录组学和代谢组学分析揭示了白蜡种子萌发过程中中枢代谢途径的调控网络。
IF 3.5 2区 农林科学
Tree physiology Pub Date : 2025-03-16 DOI: 10.1093/treephys/tpaf032
Yifan Wei, Jing Deng, Huan Tang, Jia Xu, Mingqin Zhou, Jiabao Ye
{"title":"Integrated transcriptomic and metabolomic analyses reveal regulatory networks governing hub metabolic pathways in Fraxinus hupehensis seeds during germination.","authors":"Yifan Wei, Jing Deng, Huan Tang, Jia Xu, Mingqin Zhou, Jiabao Ye","doi":"10.1093/treephys/tpaf032","DOIUrl":"https://doi.org/10.1093/treephys/tpaf032","url":null,"abstract":"<p><p>Efforts to protect germplasm resources of Fraxinus hupehensis (Oleaceae), an endangered species endemic to Dahong Mountain, Hubei Province, China, are facing difficulties due to the deep dormancy of its seeds. To elucidate the molecular regulatory networks underlying dormancy release, an integrated investigation combining physiological profiling with transcriptomic and metabolomic analyses was performed on seeds of F. hupehensis during six critical germination stages. A decrease was observed in the contents of soluble sugar, soluble starch, and crude fat as the germination process progressed, with glycolysis, the tricarboxylic acid cycle, and the pentose phosphate pathways providing energy. Plant hormones such as abscisic acid and gibberellin 4 exerted coordinated regulatory effects throughout this process. Differentially expressed genes and metabolites were detected in metabolic pathways including sugar metabolism, respiratory metabolism, protein synthesis and degradation along with lipid metabolism. Notably, structural hub genes and metabolites in metabolic pathways of starch and sucrose, respiratory, phenylalanine, and linoleic acid played crucial regulatory roles in seed germination. Furthermore, hub transcription factors within the AP2/ERF, bHLH, and MYB families were identified by Weighted Gene Correlation Network Analysis. This study unveiled the regulatory mechanisms of primary metabolic hub pathways during seed germination, providing a theoretical foundation for the breeding and conservation of F. hupehensis and other endangered plant species.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143634719","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 myb transcription factor PtoPHL3 positively regulates poplar resistance to canker disease caused by Dothiorella gregaria. myb转录因子PtoPHL3正调控杨树对Dothiorella gregaria溃疡病的抗性。
IF 3.5 2区 农林科学
Tree physiology Pub Date : 2025-03-09 DOI: 10.1093/treephys/tpaf028
Wensen Shi, Jianglin Luo, Jiacong Li, Jiale Zhao, Weiwei Wang, Ningning Chen, Shaofei Tong, Kai Chen, Li Xu, Tiannan Luo, Yongran Luo, Yao Li, Yuxuan Ren, Lushui Zhang, Tao Ma, Jianquan Liu, Yuanzhong Jiang
{"title":"The myb transcription factor PtoPHL3 positively regulates poplar resistance to canker disease caused by Dothiorella gregaria.","authors":"Wensen Shi, Jianglin Luo, Jiacong Li, Jiale Zhao, Weiwei Wang, Ningning Chen, Shaofei Tong, Kai Chen, Li Xu, Tiannan Luo, Yongran Luo, Yao Li, Yuxuan Ren, Lushui Zhang, Tao Ma, Jianquan Liu, Yuanzhong Jiang","doi":"10.1093/treephys/tpaf028","DOIUrl":"https://doi.org/10.1093/treephys/tpaf028","url":null,"abstract":"<p><p>Diseases caused by pathogenic microorganisms impair plant growth, leading to reduced crop yields. While the molecular mechanisms of plant disease response are well understood in annual herbaceous species, they remain largely unknown in perennial woody plants. Here, we found that PtoPHL3, a key transcription factor in poplar's phosphorus starvation response, showed significant expression changes after treatments with salicylic acid (SA) and methyl jasmonate (MeJA), and inoculation of Dothiorella gregaria that causes poplar canker disease. Overexpressing PtoPHL3 conferred increased resistance to D. gregaria in transgenic poplar, while RNA interference-mediated knockdown made the plants more sensitive to the pathogen. DNA affinity purification sequencing (DAP-seq) identified PtoPHL3-bound chromatin regions associated with disease response. Additionally, PtoPHL3 was found to bind the promoter of TGA6 and the gene body region of ERF5, upregulating their expression, which activates responses to D. gregaria, JA and SA. These findings deepen our understanding of the pathogen response process in poplar and lay a theoretical foundation for research on disease resistance mechanisms and the breeding of disease-resistant germplasm.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143587145","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 effects of expression of a hyperthermophilic endoglucanase and nutrient conditions on poplar growth and physiology. 超嗜热内切葡聚糖酶的表达及营养条件对杨树生长和生理的影响。
IF 3.5 2区 农林科学
Tree physiology Pub Date : 2025-03-09 DOI: 10.1093/treephys/tpaf029
Bethanie M Natalie, Elise Krespan, Yao Xiao, Katie M Becklin, Heather D Coleman
{"title":"The effects of expression of a hyperthermophilic endoglucanase and nutrient conditions on poplar growth and physiology.","authors":"Bethanie M Natalie, Elise Krespan, Yao Xiao, Katie M Becklin, Heather D Coleman","doi":"10.1093/treephys/tpaf029","DOIUrl":"https://doi.org/10.1093/treephys/tpaf029","url":null,"abstract":"<p><p>Efficient production and processing of poplar biomass feedstock requires costly pretreatments and enzyme additives. Transgenic alterations of poplar can reduce the need for these inputs by increasing biomass, improving lignocellulose quality, and enhancing nutrient uptake. Previously, a transgenic line of poplar expressing a bacterial hyperthermophilic endoglucanase (TnCelB) in hybrid poplar (P39, Populus alba × grandidentata) was developed and characterized. This study reports the effects on the TnCelB transgenic poplar line under a reduced nutrient treatment. Overall, the nutrient treatment was the source of more observed significant differences than the genotype. Wild type and TnCelB poplar had similar responses in biomass allocation and net photosynthesis. TnCelB trees had a wrinkled leaf phenotype and relative to wild type, had reduced total biomass, reduced water use efficiency, and a decreased proportion of cellulose to hemicellulose and lignin. In low nutrient conditions, TnCelB trees had increased structural carbohydrates with stable lignin values. The TnCelB line presents a viable option for poplar biomass feedstock, offering biomass comparable to wild type poplar and more efficient processing, with only mild negative phenotypes.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143587143","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
Strigolactones regulate Bambusa multiplex sheath senescence by promoting chlorophyll degradation. 独脚金内酯通过促进叶绿素降解调节竹多元鞘衰老。
IF 3.5 2区 农林科学
Tree physiology Pub Date : 2025-03-08 DOI: 10.1093/treephys/tpaf011
Feng Que, Yaqi Zhu, Qingnan Liu, Qiang Wei
{"title":"Strigolactones regulate Bambusa multiplex sheath senescence by promoting chlorophyll degradation.","authors":"Feng Que, Yaqi Zhu, Qingnan Liu, Qiang Wei","doi":"10.1093/treephys/tpaf011","DOIUrl":"10.1093/treephys/tpaf011","url":null,"abstract":"<p><p>Culm sheaths are capable of photosynthesis and are an important class of non-leaf organs in bamboo plants. The source-sink interaction mechanism has been found to play an important role in the interaction between culm sheaths and internodes in Bambusa multiplex. Research on the regulatory mechanisms of culm sheath senescence is important for the study of internode growth, but reports in this regard are limited. In this study, a weighted gene co-expression network analysis was performed on transcriptome data of B. multiplex culm sheaths at different developmental stages and identified some gene modules significantly related to the typical senescence stages (SS3 and SS4). Among these modules, one module significantly associated with both SS3 and SS4 was identified, and its hub gene (BmCCD8) was a key gene of the strigolactones (SLs) synthesis pathway. To verify the relationship between SLs and culm sheath senescence, we performed experiments such as detection of endogenous hormone, treatment with exogenous hormones, transmission electron microscopic observation and detection of gene expression levels. A positive relationship was found between the SL content and the degree of sheath senescence. Treatment with the artificial SL analog GR24 resulted in a significant decrease in chlorophyll content in the sheath, while treatment with the SL synthesis inhibitor Tis108 led to a significant increase in chlorophyll content. A different response pattern to exogenous GR24 and Tis108 was also observed in genes related to the chlorophyll degradation pathway. Chloroplasts were also found to begin degradation one day after the end of exogenous GR24 treatment. Thus, we concluded that SLs may regulate culm sheath senescence by promoting chlorophyll degradation.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":"45 3","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143664027","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
Distinct seasonality of nutrients in twigs and leaves of temperate trees. 温带树木的细枝和叶中养分的明显季节性。
IF 3.5 2区 农林科学
Tree physiology Pub Date : 2025-03-08 DOI: 10.1093/treephys/tpaf014
Yuehan Tian, Enzai Du, Yang Tang, Nan Xia
{"title":"Distinct seasonality of nutrients in twigs and leaves of temperate trees.","authors":"Yuehan Tian, Enzai Du, Yang Tang, Nan Xia","doi":"10.1093/treephys/tpaf014","DOIUrl":"10.1093/treephys/tpaf014","url":null,"abstract":"<p><p>Seasonal variation of nutrient concentrations in different organs is an essential strategy for temperate trees to maintain growth and function. The seasonal variations and variability (i.e., seasonality) of leaf nutrient concentrations have been well documented, while the trends and magnitudes of such seasonal variations in other tree organs (e.g., twigs) and their associations with leaf nutrients remain poorly understood. We measured the concentrations of 10 nutrients (nitrogen, N; phosphorus, P; potassium, K; calcium, Ca; magnesium, Mg; iron, Fe; manganese, Mn; copper, Cu; zinc, Zn; boron, B) in twigs and leaves of four temperate tree species (i.e., Pinus tabuliformis, Ginkgo biloba, Cotinus coggygria, and Sophora japonica) to explore their seasonal variations and seasonality. Our results showed that macronutrient concentrations (N, P, K, Ca, and Mg) were significantly higher in leaves and micronutrient concentrations (Fe, Mn, Cu, and Zn) were significantly higher in twigs. Concentrations of P and K both showed a negative seasonal covariation between twigs and leaves, while Ca, Fe, Mn, Cu, Zn, and B showed an opposite relationship. Compared with mobile nutrients, nonmobile nutrients exhibited significantly greater seasonality in the leaves but there were no such differences in twigs. The seasonality of nutrient concentrations in twigs was significantly stronger than in leaves and they were positively correlated. Additionally, nutrients with higher physiological requirements in leaves showed weaker seasonality, confirming the hypothesis of seasonal stability of high-demand nutrients, while such relationships were not statistically significant for twigs. This study demonstrates distinct seasonality of nutrients in twigs and leaves of temperate woody plants. These findings highlight that high-demand nutrients show stronger seasonal stability in leaves but not in twigs and uncover the seasonal coordination between twigs and leaves as a nutrient conservation strategy.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":"45 3","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143664650","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
Trade-offs between residual conductance, hydraulic capacitance and water access in Mediterranean species. 在地中海物种的剩余电导,水力电容和水访问之间的权衡。
IF 3.5 2区 农林科学
Tree physiology Pub Date : 2025-03-08 DOI: 10.1093/treephys/tpaf023
Junzhou Liu, Uri Hochberg, Asaf Alon, Shabtai Cohen
{"title":"Trade-offs between residual conductance, hydraulic capacitance and water access in Mediterranean species.","authors":"Junzhou Liu, Uri Hochberg, Asaf Alon, Shabtai Cohen","doi":"10.1093/treephys/tpaf023","DOIUrl":"10.1093/treephys/tpaf023","url":null,"abstract":"<p><p>Dry season droughts may increasingly threaten Mediterranean forests under climate change. While plants employ three desiccation avoidance strategies to avoid or delay dehydration damage, including reduced water loss, enhanced tissue water storage, and improved root water access, resource allocation competition may lead to trade-offs among these strategies that are not yet fully understood. We investigated six Mediterranean woody species by analysing: (1) twig hydraulic capacitance (0.32 - 2.81 mmol m-2 MPa-1) representing tissue water storage capacity; (2) twig residual conductance (gres) at 25 °C (1.23 - 7.73 mmol m-2 s-1) reflecting water loss rate; and predawn water potential (ΨPD) and its difference from midday water potential (∆Ψ) at the end of the dry season as root water access indicators. Significant trade-offs in plant desiccation avoidance strategies were observed as gres positively correlated with ∆Ψ (R2 = 0.78, P = 0.02) and twig hydraulic capacitance negatively correlated with ΨPD (R2 = 0.68, P = 0.04). Consequently, species with greater root water access exhibited lower tissue water storage capacity and higher gres, potentially increasing mortality risk when soil moisture becames limiting. By inverting a plant desiccation model, we also demonstrated that minimum survival-required hydraulic capacitance and a novel risk index were both positively correlated with ΨPD, consistent with historical mortality records. Additionally, despite temperature-dependent gres patterns which revealed species-specific responses, elevated temperatures amplified the risk index for all species.</p>","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143442099","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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