Annals of botany最新文献

{"title":"Taxonomically conservative root phenolic compounds underpin biogeochemical niche separation between grasses and forbs in temperate steppes of northern China.","authors":"Baolan Wang, Zhuo Chen, Wenhao Zhang","doi":"10.1093/aob/mcag127","DOIUrl":"https://doi.org/10.1093/aob/mcag127","url":null,"abstract":"<p><strong>Background and aims: </strong>The temperate steppes are dominated by perennial grass and forb species and biogeochemical niche (BN) separation exists universally in leaves between grasses and forbs at different scales. However, the underlying physiological mechanisms still remain unresolved.</p><p><strong>Methods: </strong>We measured macronutrients, micronutrients and total phenolic compounds in both leaves and roots of nineteen grass and thirty-nine forb species across the Inner Mongolia grassland in northern China, and investigated relationships between root phenolic compounds and BN separation in both leaves and roots at functional group level.</p><p><strong>Key results: </strong>Forbs displayed significantly higher concentrations of both leaf and root macronutrient (N, P, S, K, Ca and Mg) than grasses regardless of species and functional groups. Although concentrations of leaf micronutrients (e.g. Fe and Mn) were higher in forbs than in grasses, concentrations of root Fe and Mn were extremely low in forbs than in grasses. Metabonomics and physiological analyses showed that roots of forb plants synthesized and secreted higher phenolic compounds than grass plants at both species and functional group levels. Concentrations of root macronutrients (C, N, P and Ca) were positively correlated with concentrations of total root phenolic compounds, but concentrations of root micronutrients (Fe and Mn) were negatively associated with concentrations of total root phenolic compounds between grasses and forbs. In addition, multiple leaf mineral concentrations (including P, Mg, Ca, Fe, Mn, Zn and Cu) were positively correlated with concentrations of total root phenolic compounds between grasses and forbs.</p><p><strong>Conclusions: </strong>Our findings underscore that forb species have evolved both higher nutrients and higher phenolic compounds compared to grass species in steppes of northern China. Root phenols-facilitated nutrient acquisition and transportation are involved in leaf and root BN separation between grasses and forbs. These findings may provide valuable insights in predicting species coexistence and biogeochemical cycling in temperate steppes.</p>","PeriodicalId":8023,"journal":{"name":"Annals of botany","volume":" ","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147855791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"How early do Cerrado grasses become fire-resilient? Insights from an ontogenetic experiment.","authors":"Rosani Klein Reinke, Natashi Pilon, Rosana Marta Kolb","doi":"10.1093/aob/mcag129","DOIUrl":"https://doi.org/10.1093/aob/mcag129","url":null,"abstract":"<p><strong>Background and aims: </strong>Fire is a recurring ecological disturbance in tropical grassy biomes, exerting strong selective pressure. Although adult species have a high capacity for resprouting, little is known about the age at which young plants acquire resilience to fire. This knowledge has practical implications when considering fire management frequency and the introduction of prescribed burns in areas under restoration to ensure the survival of vegetation. Thus, our objective was to evaluate the time required for native Cerrado grasses to become resilient to fire, analyzing their survival and recovery capacities at different developmental stages.</p><p><strong>Methods: </strong>We conducted a greenhouse experiment with three native species frequently used in restoration projects (Aristida riparia, Loudetiopsis chrysothrix, and Trachypogon spicatus). At 3, 6, 12, and 18 months of age, the plants were subjected to controlled burning (10 seedlings for each burning time). After each fire, we monitored plants' survival and traits related to regrowth (i.e., number of tillers, number of leaves, leaf length, and aerial biomass) for 120 days.</p><p><strong>Key results: </strong>We found high survival rates as early as 3 months of age (above 50%), with increases to values above 70% in subsequent growth stages. Overall, the resilience to fire increases with plant age, reaching almost 100% in plants within 12 months. However, fire performed before the dry season reduces the rate of recovery. The biomass accumulation after fire was higher in plants within 18 months, likely due to the greater availability of stored reserves and buds for resprouting. Considering regrowth traits, we found positive values when compared to pre-fire values.</p><p><strong>Conclusion: </strong>For fire management, it is recommended that burning be carried out when the grass seedlings are at least 12 to 18 months old. In addition, burning should be avoided before the start of the dry season to promote faster recovery and greater growth of grasses after the fire.</p>","PeriodicalId":8023,"journal":{"name":"Annals of botany","volume":" ","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147855717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Decoding Rice Seed Storage Proteins: From Gene Identification to Structural Prediction.","authors":"Antima Yadav, Priya Jaiswal, Iny Elizebeth Mathew, Akanksha Panwar, Pinky Agarwal","doi":"10.1093/aob/mcag124","DOIUrl":"https://doi.org/10.1093/aob/mcag124","url":null,"abstract":"<p><strong>Background and aims: </strong>Rice seed storage proteins (SSPs) are major determinants of grain nutritional quality, serving as primary sources of dietary protein, energy, and essential nutrients. However, limited understanding of their diversity, evolution, and regulation constrains efforts to improve grain quality. This study aimed to perform a comprehensive genome-wide characterization of SSPs in rice.</p><p><strong>Methods: </strong>A combined homology- and domain-based approach was employed to identify SSP-encoding genes in the rice genome. These proteins were further analysed through phylogenetic reconstruction, domain and motif characterization, promoter cis-element analysis, expression profiling across seed developmental stages, and three-dimensional structural modelling.</p><p><strong>Key results: </strong>A total of 65 SSP genes were identified, including 19 previously uncharacterized members. Phylogenetic and domain analyses revealed evolutionary relationships between albumins and prolamins, and between globulins and glutelins. Tandem clustering of albumins, glutelins, and prolamins suggested gene duplication as a major driver of SSP family expansion. Expression profiling indicated that albumins, globulins, and glutelins were transcriptionally active from the S2 stage, whereas prolamins were predominantly expressed from the S3 stage onwards. Promoter analysis identified several seed-specific cis-regulatory elements, including CAATBOX1, EBOXBNNAPA, and DOFCOREZM. Structural modelling showed that albumins and prolamins are primarily composed of α-helices, while globulins and glutelins are enriched in β-strands and coils.</p><p><strong>Conclusions: </strong>This integrative analysis provides comprehensive insights into the classification, evolution, regulatory mechanisms, and structural features of rice SSPs. The findings establish a valuable resource for future functional studies and offer a foundation for strategies aimed at improving grain nutritional quality.</p>","PeriodicalId":8023,"journal":{"name":"Annals of botany","volume":" ","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147855737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evolutionary history, taxonomy, and ecology of Neotropical Cissus (Vitaceae) in the biotic transition zone of Mexico and Central America.","authors":"Alberto J Coello, Angélica Gallego-Narbón, Carter Keyworth, Angélica Quintanar-Castillo, Gabriel Johnson, Marcelo R Pace, Jun Wen","doi":"10.1093/aob/mcag123","DOIUrl":"https://doi.org/10.1093/aob/mcag123","url":null,"abstract":"<p><strong>Background and aims: </strong>Mexico constitutes a biotic transition zone between Nearctic and Neotropical floras, which alongside its complex geography and climatic variability makes it an especially diverse region. Cissus, the largest genus of Vitaceae, has c. 70 species in the Neotropics, with 20-25 species in Mexico and Central America, occupying diverse environments from tropical forests to deserts. Despite its ecological relevance in the area, Neotropical Cissus species have been barely studied. Here we aim to address the phylogenetic history, taxonomic delimitation, biogeography, and ecological preferences of Cissus in the biotic transition zone of Mexico and Central America.</p><p><strong>Methods: </strong>We obtained nuclear and plastid phylogenies of Neotropical Cissus using target enrichment Hyb-Seq, sampling c. 50% of the Neotropical species and most Mexican species. We performed time calibration and biogeographic analyses to assess the colonization history, performed ancestral reconstructions of relevant taxonomic traits, and studied geographic and climatic differences between clades and species in Mexico and Central America using climatic principal component analyses.</p><p><strong>Key results: </strong>Four main clades were retrieved in Neotropical Cissus via phylogenomics, with putative early hybridization detected between clades. Morphological examination and phylogenetic data provided support for taxonomic reassessment in Mexico. Biogeographic analyses pointed to several colonization events to Mexico during the Oligocene and the Miocene, with xeric species from western Mexico clustering in a single mid Miocene lineage. Climatic and geographic analyses supported differences between clades, and mountain ranges were suggested to have acted as geographic and climatic barriers for some lineages.</p><p><strong>Conclusions: </strong>Our research recovered four main clades with significantly distinct geographic and climatic preferences in Neotropical Cissus. Mexico was colonized several times and geographic and climatic isolations were crucial for speciation. Our results highlighted the presence of hidden species diversity in Mexico, underscoring the need for integrative biodiversity discovery in the Mexico transition zone.</p>","PeriodicalId":8023,"journal":{"name":"Annals of botany","volume":" ","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147832387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carbon starvation as a mechanistic explanation for the gradual decline of savanna ground-layer species under tree encroachment.","authors":"Davi R Rossatto, Marina C Scalon","doi":"10.1093/aob/mcag122","DOIUrl":"https://doi.org/10.1093/aob/mcag122","url":null,"abstract":"<p><strong>Background: </strong>Tropical savannas worldwide have been experiencing woody encroachment, i.e., the rapid increase in density and biomass of woody plants in formerly open environments. In savannas, this process is primarily driven by the absence of fire, which allows woody species to outcompete the herbaceous layer, ultimately leading to losses on ground-layer biodiversity.</p><p><strong>Scope: </strong>Causes of savanna encroachment are well documented. However, the mechanisms behind how encroachment exclude typical ground-layer species are not clearly comprehended, and typically classified as a simplistic effect of \"shade intolerance\". Here we briefly review the encroachment phenomenon, its causes and effects in open savanna vegetation. To develop a mechanistic hypothesis for the gradual decline of ground-layer vegetation, we synthesised leaf trait and physiological data from ground-layer plants. Encroachment changes canopy cover and the light environment, affecting the richness and diversity of ground-layer species and reflecting the progressive transition from open to closed-canopy environments. This pattern may be related to the inability of ground-layer plants to maintain a positive carbon balance under shaded conditions, a physiological state equivalent to carbon starvation. Although species can show significant leaf plasticity in response to light conditions, they depend on carbohydrate reserves stored in underground organs to maintain vital processes when photosynthetic capacity declines. These reserves, however, are finite, ultimately leading to individual mortality and species exclusion.</p><p><strong>Conclusions: </strong>Shade intolerance alone offers a simplistic explanation to ground layer exclusion under encroachment. We propose that encroachment leads to a physiological response in ground-layer plants changing sink-source aspects in a process analogous to the carbon starvation hypothesis. We suggest that analysing primary metabolism and carbon-based traits is essential to quantify plant persistence and determine the physiological thresholds under encroachment.</p>","PeriodicalId":8023,"journal":{"name":"Annals of botany","volume":" ","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147832391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fresh out of the seed coat: first leaves of germinants are equally heat tolerant but less cold tolerant than later life stages.","authors":"Philippa R Alvarez, Mara Jutta Imdahl, Alicia M Cook, Verónica F Briceño, Catherine A Offord, Adrienne B Nicotra, Andy Leigh","doi":"10.1093/aob/mcag117","DOIUrl":"https://doi.org/10.1093/aob/mcag117","url":null,"abstract":"<p><strong>Background and aims: </strong>Plant photosystem thermal thresholds are regularly used as indicators for plant tolerance under extreme temperature scenarios. Photosystem tolerance can vary with species, leaf traits and environmental conditions. To date, most research into plant thermal tolerance has been conducted on established plants; likewise, leaf traits are routinely measured on fully expanded, adult leaves. To fully understand function and survival of plant communities, the first leaves of early life stages must be considered.</p><p><strong>Methods: </strong>We sought to understand germinant photosystem thermal tolerance breadth through upper and lower critical temperature (Tcrit) thresholds, leaf mass per area (LMA) and leaf water content (LWC) for 22 species from three contrasting biomes - extreme desert and alpine, and benign coastal temperate. For seven of these species, we compared the relationship between these traits with those of older juvenile and adult life stages.</p><p><strong>Key results: </strong>Biome of origin had no effect on germinant thermal thresholds. Thermal tolerance breadth (heat minus cold tolerance thresholds) varied significantly among germinant species, but not across the three life stages. However, although germinant heat tolerance within species was comparable to adult thermal tolerance, germinants were significantly less cold tolerant than adults. LMA was greater in older life stages than in germinants, LWC decreased across the life stages. LMA was greater in older life stages than in germinants and LWC decreased as LMA increased.</p><p><strong>Conclusions: </strong>In the first known study examining photosystem thermal tolerance breadth of newly emerged leaves of germinants, we found germinant PSII to be as heat tolerant as later life stages, but less cold tolerant, associated with their lower LMA and higher LWC. This demonstrates that not all physiological aspects of germinant tolerance are more vulnerable to thermal extremes than older life stages, with certain leaf traits potentially playing an important role in early survival.</p>","PeriodicalId":8023,"journal":{"name":"Annals of botany","volume":" ","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147832404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seed structure and germination ecophysiology of Arenga wightii Griff., an endemic vulnerable palm of Southern Western Ghats.","authors":"Arun R Pillai, Elenjikkal Avarachan Siril","doi":"10.1093/aob/mcag088","DOIUrl":"https://doi.org/10.1093/aob/mcag088","url":null,"abstract":"<p><strong>Background and aims: </strong>Seed germination is the most vital yet challenging stage of tropical palms and the ecophysiology of this process remains undefined. Arenga wightii, an endemic palm of the Southern Western Ghats, is of key interest for toddy harvest and other value-added products. Under natural conditions, this palm regenerates from seeds with low germination. However, the reasons behind the decline in regeneration of this threatened species remain unexplored. We hypothesize that the localised distribution of the palm in the shady regions of the Southern Western Ghats is due to ecophysiological factors related to seed germination and dormancy type.</p><p><strong>Methods: </strong>We investigated the imbibition time, and the optimum temperature for germination was determined using seed germinators. Dormancy was defined using treatment with dormancy breaking methods. Features of early seedlings were examined through anatomical and histochemical methods.</p><p><strong>Key results: </strong>Mature seeds shed with a moisture content of 35%. The physiological, morphoanatomical and histochemical results indicate recalcitrant traits. The seeds exhibit non-deep simple morphophysiological dormancy. Germination of fresh seeds was below 35%; removal of the operculum increased germination to 97% and reduced the mean germination time (MGT) to 5 days. Germination was of a remote non-ligular type, and the seedlings exhibited adaptations to swampy habitats.</p><p><strong>Conclusion: </strong>Our findings indicate that slow seed germination, coexistence of dormancy, coupled with recalcitrant traits, indicate the critical nature of temperature requirement, and are an adaptation for survival in humid and shady areas of the Southern Western Ghats. Habitat protection and removal of the operculum from mature seeds are effective for generating seedlings for large scale restoration.</p>","PeriodicalId":8023,"journal":{"name":"Annals of botany","volume":" ","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147810003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A shift in species niche through autopolyploidy: From sexual to vegetative reproduction in Saxifraga oppositifolia.","authors":"Ingrid Vesterdal Tjessem, Anne Krag Brysting, Trond Reitan, Simen Salomonsen Hjelle, Pernille Bronken Eidesen","doi":"10.1093/aob/mcag116","DOIUrl":"https://doi.org/10.1093/aob/mcag116","url":null,"abstract":"<p><strong>Background and aims: </strong>Polyploidy has been essential in the evolution of angiosperms, facilitating novel adaptations, enhancing speciation, and contributing to the establishment of larger evolutionary lineages. However, newly formed polyploids require sufficient niche differentiation to survive and coexist with the diploid ancestor. Polyploids are commonly reproductively challenged, which may lead to rapid development of asexual reproduction, which may, in turn, lead to reproductive barriers or ecological niche divergence. Through this study, we investigate whether autopolyploidization has induced a shift from sexual reproduction to vegetative propagation in the arctic-alpine Saxifraga oppositifolia (Saxifragaceae) and thus facilitated the establishment of polyploids in mixed-cytotype populations.</p><p><strong>Methods: </strong>We sampled data on capsule- and seed production, seed germination, rooting ability, and leaf production among cytotypes through a combination of growth chamber experiments and in-situ observations in a field setup across different habitats (ridges, slopes, and riverbeds) in Svalbard including > 700 georeferenced S. oppositifolia plants with known cytotype (diploid, triploid, or tetraploid). Through hypothesis testing and an explorative model search for relevant covariates (e.g., growth form, habitat, soil type), we tested the effect of cytotype on sexual and vegetative reproductive outcomes.</p><p><strong>Key results: </strong>Polyploids had lower sexual reproductive investment (i.e., capsule production and seed production) and higher vegetative investment (i.e., leaf production and rooting ability), showing that polyploidy significantly has affected both sexual reproduction and vegetative propagation.</p><p><strong>Conclusions: </strong>Our findings confirm a shift in reproductive strategy towards less sexual investment and enhanced vegetative investment in triploid and tetraploid individuals. This shift may enhance polyploid survival in habitats with shorter growing season and limited pollinator availability, and thus explains their higher frequency in such habitats. These results support autopolyploidy as an evolutionary mechanism that may allow Arctic species to adapt to ongoing, rapid changes.</p>","PeriodicalId":8023,"journal":{"name":"Annals of botany","volume":" ","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147760166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bark protection and light-adapted photosynthesis influence woody productivity of Cerrado trees in changing fire regimes.","authors":"Francisco Navarro-Rosales, Wesley Jonatar Alves da Cruz, Edouard Philippe Distin-Carvalho, Manoela S Machado, Flavio de Campos Oliveira, Marcelo Leandro Feitosa de Andrade, Maria Antonia Carniello, Imma Oliveras Menor","doi":"10.1093/aob/mcag115","DOIUrl":"https://doi.org/10.1093/aob/mcag115","url":null,"abstract":"<p><strong>Background and aims: </strong>Changing fire regimes within open ecosystems can have important impacts on plant vulnerability, carbon cycling and ecosystem functioning. Thus, in this study, we investigate stem net primary productivity (NPP) dynamics of savanna vegetation in the Amazon-Cerrado transition, making use of an experimental fire and ecosystem monitoring project. We aimed to determine i) how different species contribute to plot-level stem NPP and how this changes with fire frequency; ii) how different fire frequencies affect the average stem NPP and survival of dominant species; and iii) if fire-induced changes in species-level stem NPP and survival are influenced by functional traits.</p><p><strong>Methods: </strong>We use tree inventory data (height and diameter of stems) to quantify plot- and tree-level stem NPP across unburnt, annual, biennial and triennial fire frequencies. We compare before and after estimates of average stem NPP and survival of dominant species using mixed-effects models, and identify key traits linked with changes in productivity and survival via principal component and regime-interval-trait interaction analyses.</p><p><strong>Key results: </strong>Generalist species dominate stem NPP in unburnt conditions (Tachigali vulgaris accounts for 72% of NPP), but become less dominant within our less frequent fire regimes (biennially and triennially burnt plots), which favour more sclerophyllous savanna trees. There is a trade-off between plant productivity and tolerance to fire, influenced by functional traits. In less frequent fire conditions (triennially burnt plots), tree growth and productivity are maintained by bark protection, high photosynthetic rates and photosynthetic shade intolerance.</p><p><strong>Conclusions: </strong>These findings allow us to better predict how fire regimes of varying frequencies will filter the communities of Cerrado trees, and which set of species will confer greater resilience to landscapes across this threatened region. The diverse productivity strategies of Cerrado vegetation are determined by the interaction between fire regimes and functional traits. Burning can successfully limit woody encroachment and help conserve open ecosystem diversity and functioning in the Cerrado.</p>","PeriodicalId":8023,"journal":{"name":"Annals of botany","volume":" ","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147760232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Strigolactone regulates phosphorus recycling in rice (Oryza sativa) through a nitric oxide-dependent pathway.","authors":"Chuan Jin Shan, Yong Qiang Gao, Ruo Xi Wang, Su Li, Ren Fang Shen, Da Li Zeng, Xiao Fang Zhu","doi":"10.1093/aob/mcag112","DOIUrl":"https://doi.org/10.1093/aob/mcag112","url":null,"abstract":"<p><p>Strigolactone (GR24) has been implicated in the plant response to phosphorus (P) stress; nonetheless, the precise molecular mechanisms involved remain obscure. The present study examined the role of GR24 in regulating the internal distribution of P and the mobilization of P from root cell walls in rice. The research involved subjecting rice plants to differential treatments of GR24 and P, followed by a comprehensive analysis employing biochemical and molecular methodologies to elucidate the mechanisms underlying P utilization. The findings indicated that diminished P levels result in a swift escalation of endogenous GR24 accumulation within the roots of rice plants. Moreover, the application of exogenous GR24 notably augmented the tolerance of rice to P deficiency, as evidenced by the enhancement of biomass and a reduction in the root/shoot ratio under P deficient conditions. The application of GR24 also alleviated the decline in P content observed in both roots and shoots. At a mechanistic level, GR24 facilitated the reutilization of P, particularly within the root pectin fraction, thereby increasing the liberation of soluble P. Additionally, GR24 promoted the expression of OsPHT1;2 (OsPT2), a gene implicated in the translocation of P from roots to shoots. Furthermore, it was observed that GR24 stimulated the production of nitric oxide (NO) in P-deficient rice roots. The application of sodium nitroprusside (SNP) further augmented the alleviating effect of GR24 on P deficiency. In summary, these findings underscore the potential of GR24 as a viable strategy to enhance the tolerance of rice to P deficiency and to improve P use efficiency in agricultural applications.</p>","PeriodicalId":8023,"journal":{"name":"Annals of botany","volume":" ","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147760351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}