Tree physiology最新文献

Water use strategies in pines and oaks across biomes are modulated by soil water availability.

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":"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.","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.

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":"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.","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.

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":"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.","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.

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":"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.","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.

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":"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.","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.

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":"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.","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":"143068215","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.

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":"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.","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

Physiological adjustments of temperate tree species and herbs in response to low root temperatures.

IF 3.5 2区农林科学

Tree physiology Pub Date : 2025-03-08 DOI: 10.1093/treephys/tpaf018

Yating Li, Guenter Hoch

{"title":"Physiological adjustments of temperate tree species and herbs in response to low root temperatures.","authors":"Yating Li, Guenter Hoch","doi":"10.1093/treephys/tpaf018","DOIUrl":"10.1093/treephys/tpaf018","url":null,"abstract":"Hydraulic constraints induced by low root temperature might be a major cause for the low temperature limit of plants. However, to date most of our knowledge on the physiological effects of low root temperatures is derived from short-term lab experiments, with very limited information on potential adjustments to continuous low temperature stress. In this study, we quantified the cold sensitivity of root water uptake and transport to leaves in seedlings of different functional plant types (conifers, broadleaved trees and annual herbs) by 2H-H2O labeling after exposure to three constant root temperatures (15 °C, 7 °C and 2 °C) but the same higher aboveground temperatures (between 20 and 25 °C). We investigated changes in the cold sensitivity of roots after 0, 10 and 20 days prolonged exposure to the respective root temperatures. Plant water uptake and transport was decreased by lowered root temperature in all species, with a stronger effect at 2 °C compared with 7 °C. The water uptake and transport capacity of tree species gradually declined over the 20-day treatment, while the two investigated herbs exhibited immediately strong decreases that were kept at the same low level throughout the entire experiment time. The speed of the water uptake reduction across the 20 days observation period differed among the tree species and was faster in species that reach their natural upper distribution limits at lower elevations compared with species that occur at subalpine regions. The restricted root water uptake and transport was accompanied by reductions in leaf water potential, stomatal conductance and growth. Overall, our study showed increasingly reduced capacity for water uptake and transport across functional plant groups at continuous cold root conditions. This result might indicate accumulative negative effects on cell membrane permeability for water in roots, or a controlled reduction of root water conductivity of temperate trees in preparation for winter dormancy.","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":"143664604","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.

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":"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.","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":"143053361","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 adjustments of temperate tree species and herbs in response to low root temperatures.

IF 3.5 2区农林科学

Tree physiology Pub Date : 2025-03-08 DOI: 10.1093/treephys/tpaf018

Yating Li, Guenter Hoch

{"title":"Physiological adjustments of temperate tree species and herbs in response to low root temperatures.","authors":"Yating Li, Guenter Hoch","doi":"10.1093/treephys/tpaf018","DOIUrl":"10.1093/treephys/tpaf018","url":null,"abstract":"Hydraulic constraints induced by low root temperature might be a major cause for the low temperature limit of plants. However, to date most of our knowledge on the physiological effects of low root temperatures is derived from short-term lab experiments, with very limited information on potential adjustments to continuous low temperature stress. In this study, we quantified the cold sensitivity of root water uptake and transport to leaves in seedlings of different functional plant types (conifers, broadleaved trees and annual herbs) by 2H-H2O labeling after exposure to three constant root temperatures (15 °C, 7 °C and 2 °C) but the same higher aboveground temperatures (between 20 and 25 °C). We investigated changes in the cold sensitivity of roots after 0, 10 and 20 days prolonged exposure to the respective root temperatures. Plant water uptake and transport was decreased by lowered root temperature in all species, with a stronger effect at 2 °C compared with 7 °C. The water uptake and transport capacity of tree species gradually declined over the 20-day treatment, while the two investigated herbs exhibited immediately strong decreases that were kept at the same low level throughout the entire experiment time. The speed of the water uptake reduction across the 20 days observation period differed among the tree species and was faster in species that reach their natural upper distribution limits at lower elevations compared with species that occur at subalpine regions. The restricted root water uptake and transport was accompanied by reductions in leaf water potential, stomatal conductance and growth. Overall, our study showed increasingly reduced capacity for water uptake and transport across functional plant groups at continuous cold root conditions. This result might indicate accumulative negative effects on cell membrane permeability for water in roots, or a controlled reduction of root water conductivity of temperate trees in preparation for winter dormancy.","PeriodicalId":23286,"journal":{"name":"Tree physiology","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11922318/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143190609","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