AoB Plants最新文献

{"title":"Adaptive constraints at the range edge of a widespread and expanding invasive plant","authors":"Rebecca A Fletcher, Daniel Z Atwater, David C Haak, Muthukumar V Bagavathiannan, Antonio DiTommaso, Erik Lehnhoff, Andrew H Paterson, Susan Auckland, Prabhu Govindasamy, Cornelia Lemke, Edward Morris, Lisa Rainville, Jacob N Barney","doi":"10.1093/aobpla/plad070","DOIUrl":"https://doi.org/10.1093/aobpla/plad070","url":null,"abstract":"Abstract Identifying the factors that facilitate and limit invasive species range expansion has both practical and theoretical importance, especially at the range edges. Here, we used reciprocal common garden experiments spanning the North/South and East/West range North American core, intermediate, and range edges of the globally invasive plant, Johnsongrass (Sorghum halepense) to investigate the interplay of climate, biotic interactions (i.e., competition), and patterns of adaptation. Our results suggest that rapid range expansion of Johnsongrass into diverse environments across wide geographies occurred largely without local adaptation, but that further range expansion may be restricted by a fitness trade-off which limits population growth at the range edge. Interestingly, plant competition strongly dampened Johnsongrass growth but did not change the rank order performance of populations within a garden, though this varied among gardens (climates). Our findings highlight the importance of including the range edge when studying the range dynamics of invasive species, especially as we try to understand how invasive species will respond to accelerating global changes.","PeriodicalId":48955,"journal":{"name":"AoB Plants","volume":"14 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135725904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Telescopic peristomes, hygroscopic movement, and the spore release model of <i>Regmatodon declinatus</i> (Leskeaceae Bryophyta)","authors":"Yanzhi Wu, Zhihui Wang, Zhaohui Zhang","doi":"10.1093/aobpla/plad073","DOIUrl":"https://doi.org/10.1093/aobpla/plad073","url":null,"abstract":"Abstract Moss peristome hygroscopic movement plays an important role in protecting and controlling spore release. Recent studies on the peristome's hygroscopic movement and spore release have focused on mosses with \"perfect\" peristomes, such as Brachytheciaceae, whereas the hygroscopic movement type and spore release pattern of \"specialized\" peristomes, such as Regmatodon declinatus, are poorly understood. We investigated the relationship between the peristome's hygroscopic movement and spore release in the \"specialized\" peristome of R. declinatus by the measurement of peristome hygroscopic movement parameters and the hygroscopic movement spore release test. It was found that: ①Exostomes (EX) are significantly shorter than endostomes (EN), triggering the hygroscopic movement of telescopic peristomes, in which the EX rapidly elongate while closing in on the EN, and the teeth rapidly converge. ② Spore release was minimal when peristome movement was triggered alone. The number of spores released when exposed to wind was 124 times greater than in the absence of wind. Dry capsules released seven times more spores than wet capsules. The study reveals that the hygroscopic movement of \"telescopic\" peristomes of R. declinatus did not contribute significantly to spore release. More spores were released when wind and hygroscopic movement acted synergistically. Dry capsules released the maximum number of spores. It was also revealed that structural damage to capsules can facilitate complete spore release. Finally, we modeled the release of R. declinatus spores from initiation to complete release, namely the coupled release model of wind-water-capsule structural damage.","PeriodicalId":48955,"journal":{"name":"AoB Plants","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135975633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interactions with fungi vary among <i>Tripsacum dactyloides</i> genotypes from across a precipitation gradient","authors":"Ceyda Kural-Rendon, Natalie E Ford, Maggie R Wagner","doi":"10.1093/aobpla/plad072","DOIUrl":"https://doi.org/10.1093/aobpla/plad072","url":null,"abstract":"Abstract Plant-associated microbes, specifically fungal endophytes, augment the ability of many grasses to adapt to extreme environmental conditions. Tripsacum dactyloides (Eastern gamagrass) is a perennial, drought tolerant grass native to the tallgrass prairies of the central United States. The extent to which the microbiome of T. dactyloides contributes to its drought tolerance is unknown. Ninety-seven genotypes of T. dactyloides were collected from native populations across an east-west precipitation gradient in Kansas, Oklahoma, and Texas, then grown together in a common garden for over 20 years. Root and leaf samples were visually examined for fungal density. Because fungal endophytes confer drought tolerant capabilities to their host plants, we expected to find higher densities of fungal endophytes in plants from western, drier regions, compared to plants from eastern, wetter regions. Results confirmed a negative correlation between endophyte densities in roots and precipitation at the genotype’s original location (r = -0.21 p=0.04). Our analyses reveal that the host genotype’s origin along the precipitation gradient predicts the absolute abundance of symbionts in the root, but not the relative abundances of particular organisms nor the overall community composition. Overall, these results demonstrate that genetic variation for plant-microbe interactions can reflect historical environment, and reinforce the importance of considering plant genotype in conservation and restoration work in tallgrass prairie ecosystems.","PeriodicalId":48955,"journal":{"name":"AoB Plants","volume":"5 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135975801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Indigenous Australian grass seeds as grains: Macrostructure, microstructure and histochemistry","authors":"Farkhondeh Abedi, Claudia Keitel, Ali Khoddami, Salla Marttila, Angela L Pattison, Thomas H Roberts","doi":"10.1093/aobpla/plad071","DOIUrl":"https://doi.org/10.1093/aobpla/plad071","url":null,"abstract":"Abstract Utilisation of grains of local grasses by Australia’s First Nations people for food and connection to Country has largely been lost due to colonisation. Native Australian grain production has the potential to deliver environmental, economic, nutritional and cultural benefits to First Nations people and the wider community. Revitalisation of the native grain food system can only be achieved if relevant properties of the grains are elucidated. This study aimed to characterise the grain structure and histochemistry of four Australian native grasses: Dactyloctenium radulans (Button Grass), Astrebla lappacea (Curly Mitchell Grass), Panicum decompositum (Native Millet) and Microlaena stipoides (Weeping Grass). For these species, as well as wheat and sorghum, whole-grain images were obtained via stereo microscopy, starch and the embryo were visualised, and sections of fixed grains were imaged via bright-field and fluorescence microscopy. The shape, size and colour of the whole native grains varied between the species. The aleurone layer was one-cell thick in the native species, as in the domesticated grains, except for Weeping Grass, which had a two-cell-thick aleurone. In the native grains, endosperm cell walls appeared thinner than in wheat and sorghum. Starch granules in Button Grass, Curly Mitchell Grass and Native Millet were found mainly in the central region of the starchy endosperm, with very few granules in the sub-aleurone layer, whereas Weeping Grass had abundant starch in the sub-aleurone. Protein appeared most abundant in the aleurone and sub-aleurone layers of the native grains, although in Button Grass, the starchy endosperm was observed to be rich in protein, as in wheat and sorghum. As a proportion of the whole grain, the embryo was larger in the native species than in wheat. The differences found in the grain properties among the four native Australian species have important implications for the agri-food industry in a changing climate.","PeriodicalId":48955,"journal":{"name":"AoB Plants","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135510225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tracking canopy chlorophyll fluorescence with a low-cost light emitting diode platform.","authors":"Logan E G Brissette, Christopher Y S Wong, Devin P McHugh, Jessie Au, Erica L Orcutt, Marie C Klein, Troy S Magney","doi":"10.1093/aobpla/plad069","DOIUrl":"10.1093/aobpla/plad069","url":null,"abstract":"<p><p>Chlorophyll fluorescence measured at the leaf scale through pulse amplitude modulation (PAM) has provided valuable insight into photosynthesis. At the canopy- and satellite-scale, solar-induced fluorescence (SIF) provides a method to estimate the photosynthetic activity of plants across spatiotemporal scales. However, retrieving SIF signal remotely requires instruments with high spectral resolution, making it difficult and often expensive to measure canopy-level steady-state chlorophyll fluorescence under natural sunlight. Considering this, we built a novel low-cost photodiode system that retrieves far-red chlorophyll fluorescence emission induced by a blue light emitting diode (LED) light source, for 2 h at night, above the canopy. Our objective was to determine if an active remote sensing-based night-time photodiode method could track changes in canopy-scale LED-induced chlorophyll fluorescence (LEDIF) during an imposed drought on a broadleaf evergreen shrub, <i>Polygala myrtifolia</i>. Far-red LEDIF (720-740 nm) was retrieved using low-cost photodiodes (LEDIF_photodiode) and validated against measurements from a hyperspectral spectroradiometer (LEDIF_{hyperspectral}). To link the LEDIF signal with physiological drought response, we tracked stomatal conductance (<i>g</i>_sw) using a porometer, two leaf-level vegetation indices-photochemical reflectance index and normalized difference vegetation index-to represent xanthophyll and chlorophyll pigment dynamics, respectively, and a PAM fluorimeter to measure photochemical and non-photochemical dynamics. Our results demonstrate a similar performance between the photodiode and hyperspectral retrievals of LEDIF (<i>R</i>² = 0.77). Furthermore, LEDIF_photodiode closely tracked drought responses associated with a decrease in photochemical quenching (<i>R</i>² = 0.69), <i>F</i>_v/<i>F</i>_m (<i>R</i>² = 0.59) and leaf-level photochemical reflectance index (<i>R</i>² = 0.59). Therefore, the low-cost LEDIF_photodiode approach has the potential to be a meaningful indicator of photosynthetic activity at spatial scales greater than an individual leaf and over time.</p>","PeriodicalId":48955,"journal":{"name":"AoB Plants","volume":"15 5","pages":"plad069"},"PeriodicalIF":2.6,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10626922/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71487784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of <i>Huntiella decorticans</i> and drought on <i>Nothofagus dombeyi</i> seedlings.","authors":"Pablo Masera,&nbsp;María Belén Pildain,&nbsp;Mariano Aquino,&nbsp;Andrés De Errasti,&nbsp;Guillermina Dalla Salda,&nbsp;Mario Rajchenberg,&nbsp;María Florencia Urretavizcaya","doi":"10.1093/aobpla/plad068","DOIUrl":"https://doi.org/10.1093/aobpla/plad068","url":null,"abstract":"<p><p>In the temperate forests of Patagonia, Argentina, <i>Nothofagus dombeyi</i>, commonly known as Coihue, has shown sensitivity to intense drought events, leading to mortality. Studies have been conducted on Coihue decline and mortality using a variety of approaches, including the role of extreme heat waves and drought, pests and pathogens, particularly the fungus <i>Huntiella decorticans</i>. This work aimed to evaluate survival, vitality, necrosis extension and growth response of inoculated and non-inoculated Coihue seedlings from different provenances exposed to different soil moisture levels. To achieve this goal, 96 Coihue seedlings from 2 different provenances were assigned to 8 different experimental treatments. Treatments were composed of the presence or absence of <i>H. decorticans</i> and different soil moisture content conditions, dry, wet and the exposure to dry condition at different times of the experiment. Both dry conditions and <i>H. decorticans</i> had negative effects on the survival and growth rate of Coihue. The combination of both factors resulted in 100 % mortality, regardless of the plants' geographical provenances. Mortality began to be observed 3 months after pathogen inoculation, during the warmest month. Necrosis extension produced by the pathogen was similar for most of the inoculated treatments. The treatment under wet condition during the experiment but subjected to dry condition in the previous growing season presented lower necrosis extension (8.4 ± 3.2 %), than the other treatments. The radial increase was also affected by the treatments and geographical provenance, being those plants exposed to dry conditions which grew less (0.19 ± 0.21 mm). This study enhances our understanding of the plant-pathogen interaction. According to our results, Coihue may become more susceptible to mortality, when <i>H. decorticans</i> and water deficit conditions act synergistically.</p>","PeriodicalId":48955,"journal":{"name":"AoB Plants","volume":"15 5","pages":"plad068"},"PeriodicalIF":2.9,"publicationDate":"2023-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10601059/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71414918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Staminal hairs increase pollinator attraction and pollination accuracy in <i>Tradescantia fluminensis</i> (Commelinaceae).","authors":"Deng-Fei Li,&nbsp;Yi-Dan Chen,&nbsp;Zhen Liu,&nbsp;Ai-Ting Liang,&nbsp;Ju Tang,&nbsp;Xian-Chun Yan","doi":"10.1093/aobpla/plad067","DOIUrl":"https://doi.org/10.1093/aobpla/plad067","url":null,"abstract":"<p><p>Staminal hairs are the particular appendages of stamens, which may affect pollinator foraging behaviour and pollen transfer. However, experimental evidence of the functions of staminal hairs in pollination remains scarce. Here, we conducted staminal hair manipulation experiments in <i>Tradescantia fluminensis</i> (Commelinaceae) to investigate their effects on visitation and pollen transfer by bees. Our observations revealed that both visitation rates and visit duration of honeybees (<i>Apis cerana</i>) to control flowers were significantly higher than that of hairless flowers. Moreover, removing the staminal hairs significantly decreased pollen deposition by honeybees (<i>A. cerana</i>), but did not affect pollen removal. The staminal hair was similar in length to the stamen and the pistil of <i>T. fluminensis</i>. The staminal hairs provide more footholds for honeybees, and they lay prone on the staminal hairs to collect pollen, which increased the accuracy of pollination through the consistent pollen placement and pick-up on the ventral surface of honeybees. These results showed that the staminal hairs in <i>T. fluminensis</i> may represent an adaptation to attract pollinators and enhance pollination accuracy.</p>","PeriodicalId":48955,"journal":{"name":"AoB Plants","volume":"15 5","pages":"plad067"},"PeriodicalIF":2.9,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10601385/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71414923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An overview of secretion in floral bracts of Tillandsioideae (Bromeliaceae), with emphasis on the secretory scales.","authors":"Igor Ballego-Campos,&nbsp;Rafaela C Forzza,&nbsp;Élder A S Paiva","doi":"10.1093/aobpla/plad066","DOIUrl":"https://doi.org/10.1093/aobpla/plad066","url":null,"abstract":"<p><p>Bromeliaceae display many water-use strategies, from leaf impounding tanks to Crassulacean acid metabolism (CAM) photosynthesis and absorbing trichomes. Recent studies show that trichomes in inflorescences of bromeliads can exude viscous secretions, protecting against various stresses, including excessive water loss. In light of this, and considering the knowledge gap regarding inflorescence trichomes in bromeliads, we aimed to investigate the presence, source and chemical nature of inflorescence secretions in species of the Tillandsioideae (Bromeliaceae) and to describe the anatomy of their floral bracts focusing on trichome structure and position. We conducted a prospection of secretory activity and anatomy in floral bracts in 52 species of Tillandsioideae and 1 early divergent Bromeliaceae species. We used histochemical tests to investigate the presence and nature of secretion combined with standard light microscopy methods. Secretion appears in all studied species of tribe Vrieseeae, in <i>Guzmania</i> species, <i>Wallisia cyanea</i>, <i>Tillandsia streptopylla</i> (Tillandsieae) and <i>Catopsis morreniana</i> (Catopsideae). It is absent in <i>Vriesea guttata</i> (Vrieseeae), <i>Racinaea crispa</i> and various <i>Tillandsia</i> species (Tillandsieae). Secretion is produced by peltate trichomes on the adaxial surface of young bracts and comprises hydrophilic and lipophilic substances. Bract anatomy revealed an internal mucilage-secreting tissue with wide distribution within the subtribe Vrieseinae. Our results point to a broad occurrence of secretion associated with bracteal scales in inflorescences of Tillandsioideae. Secretory function is strongly related to trichomes of the adaxial surface, whereas the indumentum of the abaxial side is lacking or likely associated with water absorption; the latter case is especially related to small, xeric plants. Exudates might engage in colleter-like roles, protecting against desiccation, high-radiation and herbivores. Directions for future research are presented.</p>","PeriodicalId":48955,"journal":{"name":"AoB Plants","volume":"15 5","pages":"plad066"},"PeriodicalIF":2.9,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10601381/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71414917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dark-centred umbels in Apiaceae: diversity, development and evolution.","authors":"Regine Claßen-Bockhoff,&nbsp;Ferhat Celep,&nbsp;Yousef Ajani,&nbsp;Lisa Frenken,&nbsp;Kerstin Reuther,&nbsp;Musa Doğan","doi":"10.1093/aobpla/plad065","DOIUrl":"https://doi.org/10.1093/aobpla/plad065","url":null,"abstract":"<p><p>The wild carrot (<i>Daucus carota</i>) is famous for its dark flowers in the umbel centre. Several studies have been conducted to figure out their functional significance, but the evolution of the dark centre remains an enigma. In the present paper, we consider all known apioid species with dark-centred umbels to get a deeper understanding of their biology and evolution. Based on herbaria studies, literature and field work, we reconstructed the distribution area of 10 species (7 genera, 6 clades) of Apiaceae-Apioideae. To recognize homology of the dark structures, developmental studies were conducted in <i>Artedia squamata</i> and <i>Echiophora trichophylla</i> Field studies included architecture, flower morph distribution (andromonoecy) and flowering sequence within the plants, abundancy and behaviour of umbel visitors and preliminary manipulation experiments (removal/adding of dark structures). The dark structures are not homologous to each other. In the <i>Daucus</i> alliance, central flowers or umbellets are conspicuous, whereas in other species dark brush-like (<i>A. squamata</i>) or club-shaped structures (<i>Dicyclophora persica</i>, <i>Echinophora trichophylla</i>, <i>Tordylium aegyptiacum</i>, <i>T. cappadocicum</i>) develop from a naked receptacle. Species are andromonoecious, have a modular architecture and flower in multicyclic protandrous sequence. Among the many umbel visitors, beetles were the most abundant group. Only visitors found on umbels in both flowering phases were recognized as possible pollinators. Manipulation experiments indicated that the dark structures influence the behaviour of some, but not all umbel visitors. In <i>Echinophora trichophylla</i>, a massive gall infection was observed. It is evident that the dark structures evolved several times in parallel. The brush- and club-shaped structures are interpreted as the results of mutations affecting umbel development. Dark umbel centres are most likely stabilized by selection due to their general adaptive function. Their appearance in an area known as a hotspot of beetle pollination gives rise to the assumption that they may act as beetle marks.</p>","PeriodicalId":48955,"journal":{"name":"AoB Plants","volume":"15 5","pages":"plad065"},"PeriodicalIF":2.9,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10614004/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71428232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seasonal variation in the xylem sap composition of six Australian trees and shrubs.","authors":"Adriano Losso,&nbsp;Alice Gauthey,&nbsp;Brendan Choat,&nbsp;Stefan Mayr","doi":"10.1093/aobpla/plad064","DOIUrl":"https://doi.org/10.1093/aobpla/plad064","url":null,"abstract":"<p><p>In recent years, xylem sap composition has been shown to affect xylem hydraulics. However, information on how much xylem sap composition can vary across seasons and specifically under drought stress is still limited. We measured xylem sap chemical composition ([Ca²⁺], [K⁺], [Na⁺], electrical conductivity EC and pH) and surface tension (<i>γ</i>) of six Australian angiosperm trees and shrubs over 1 year, which comprised of exceptional dry and wet periods. Percentage losses of hydraulic conductivity and predawn leaf water potential were also monitored. In all species, measured parameters changed considerably over the annual time course. Ions and pH tended to decrease during winter months whereas <i>γ</i> showed a slight increase. No clear correlation was found between sap and hydraulic parameters, except for pH that was higher when plants suffered higher drought stress levels. Results indicate xylem sap composition to be complex and dynamic, where most variation in its composition seems to be dictated by season, even under severe dry conditions. However, pH might play a role as signals of drought stress.</p>","PeriodicalId":48955,"journal":{"name":"AoB Plants","volume":"15 5","pages":"plad064"},"PeriodicalIF":2.9,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10601387/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71414922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}