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1.
BMC Oral Health ; 24(1): 818, 2024 Jul 18.
Artículo en Inglés | MEDLINE | ID: mdl-39026272

RESUMEN

BACKGROUND: This case report highlights the importance of standardized and fully digital sequential treatment in complex occlusal rehabilitation cases. To fully resolve the patient's dental needs, such cases often require multidisciplinary interventions including periodontal therapy, endodontic treatment, anterior esthetics, implant restoration, and prosthetic rehabilitation. A fully digital workflow (including facial scanners, intraoral scanners, jaw motion tracking systems, virtual articulators, and computer-aided design software) streamlined the complex treatment, enhancing workflow simplicity, efficiency, visibility, and precision. CASE PRESENTATION: The patient presented with decreased chewing efficiency of the upper and lower prostheses, along with unsatisfactory esthetic appearance of the anterior teeth. After physical examination and radiological assessment, this complex occlusal rehabilitation case required periodontal therapy, anterior esthetic enhancement, implant restoration, and fixed prosthetic rehabilitation. Therefore, a fully digital workflow was adopted. Full-crown prostheses were placed on teeth 13, 23, and 34; a fixed bridge encompassed positions 32 to 42, and single implant crowns were placed on teeth 35 and 36. Implant-supported fixed bridges were constructed for teeth 12 to 22 and 44 to 46, anchored by implants at teeth 12, 22, 44, and 46. All definitive prostheses were fabricated from zirconia ceramics, chosen for their durability and esthetic characteristics. Finally, restorations with satisfactory esthetic and functional characteristics were seated, preserving the tooth and its supporting structures. During treatment and follow-up, the T-scan occlusal analysis system was utilized to continuously monitor and guide the adjustment of occlusal distribution across the patient's dental arches. After 18 months, the patient remains satisfied with the definitive restorations. CONCLUSIONS: This report is intended to help dentists understand and implement standardized and fully digital workflows during the management of complex occlusal rehabilitation cases; it may also facilitate harmonious integration of esthetic and functional characteristics.


Asunto(s)
Coronas , Prótesis Dental de Soporte Implantado , Estética Dental , Humanos , Estudios de Seguimiento , Diseño Asistido por Computadora , Femenino , Flujo de Trabajo , Persona de Mediana Edad , Masculino , Dentadura Parcial Fija
2.
Fitoterapia ; 177: 106110, 2024 Jul 06.
Artículo en Inglés | MEDLINE | ID: mdl-38977253

RESUMEN

Six previously undescribed meroterpenoids, penicianstinoids F-K (1-6), together with four known analogues, dehydroaustinol (7), dehydroaustin (8), penicianstinoid A (9), and furanoaustinol (10), were isolated from the cultures of the algicolous fungus Penicillium sp. RR-DL-1-7, derived from the red alga Rhodomela confervoides. Their structures and relative configuration were established by detailed spectroscopic analysis of NMR and HR-MS experiments, and the absolute configurations were assigned by X-ray diffraction and ECD spectral analysis. None of the isolates showed obvious growth inhibitory effects against five plankton and four bacteria species tested.

3.
Sci Rep ; 14(1): 16719, 2024 Jul 19.
Artículo en Inglés | MEDLINE | ID: mdl-39030243

RESUMEN

The purpose of this work is to explore the properties of the lignin-derived amine-free photoinitiating systems (PISs) during the curing process. Four novel hydrogen donors (HD1, HD2, HD3, and HD4) derived from lignin α-O-4 structural were designed and synthesized by simple methods, and their low C-H bond dissociation energies on methylene were determined by molecular orbitals theory. Four experimental groups using CQ (camphorquinone)/HD PIs formulated with Bis-GMA/TEGDMA (70 w%/30 w%) were compared to CQ/EDB (ethyl 4-dimethylamino benzoate) system. The photopolymerization profiles and double bond conversion rate was tracked by FTIR experiments; the color bleaching ability of the samples and color aging test assay were performed using color indexes measurements; The cytotoxicity of the samples was also compared to EDB related systems. All of the experimental groups with new HDs were compared to the control group with EDB by statistical analysis. Compared to CQ/EDB system, new lignin-derived hydrogen donors combined with CQ showed comparable or even better performances in polymerization initiation to form resin samples, under a blue dental LED in air. Excellent color bleaching property was observed with the new HDs. Aging tests and cytotoxicity examination of the resin were performed, indicating the new lignin compounds to be efficient hydrogen donors for amine-free CQ-based photo-initiating system. Novel lignin α-O-4 derived hydrogen donors are promising for further usage in light-curing materials.


Asunto(s)
Lignina , Polimerizacion , Lignina/química , Hidrógeno/química , Terpenos/química , Espectroscopía Infrarroja por Transformada de Fourier , Resinas Sintéticas/química , Materiales Dentales/química , Polietilenglicoles/química , Ácidos Polimetacrílicos/química , Alcanfor/análogos & derivados
4.
Plant Physiol Biochem ; 213: 108823, 2024 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-38905727

RESUMEN

Cadmium (Cd) is a widely distributed heavy metal pollutant that is detrimental to growth and development of plants. The secretion of indole-3-acetic acid is one of the defense mechanisms when plants inflict heavy metal stress. This study aimed to explore how 4-phenoxyphenylboronic acid, an effective IAA inhibitor, induces changes in IAA level, Cadmium accumulation, and activation of defense responses in rice seedling roots under different Cadmium concentrations. Our research results show that: 1) root growth was promoted with PPBa addition under mild Cadmium treatment. 2) the root IAA level improved with increasing Cadmium concentration, and PPBa had a significant inhibitory effect on IAA level. 3) PPBa had no effect on the Cadmium accumulation in rice seedling roots. 4) PPBa had a significant inhibitory effect on the generation of H2O2 under mild and moderate Cadmium treatment. 5) PPBa exacerbated the imbalance of osmotic substances in rice seedling roots under severe Cadmium treatment. This study helps us understand the tolerance and endogenous regulation of plants to heavy metal stress.


Asunto(s)
Cadmio , Peróxido de Hidrógeno , Ácidos Indolacéticos , Oryza , Raíces de Plantas , Plantones , Oryza/efectos de los fármacos , Oryza/metabolismo , Oryza/crecimiento & desarrollo , Ácidos Indolacéticos/metabolismo , Cadmio/toxicidad , Cadmio/metabolismo , Raíces de Plantas/efectos de los fármacos , Raíces de Plantas/metabolismo , Raíces de Plantas/crecimiento & desarrollo , Plantones/efectos de los fármacos , Plantones/metabolismo , Plantones/crecimiento & desarrollo , Peróxido de Hidrógeno/metabolismo , Estrés Fisiológico/efectos de los fármacos , Ácidos Borónicos/farmacología
5.
Int J Ophthalmol ; 17(6): 1110-1119, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38895674

RESUMEN

AIM: To compare high or low concentration of hyaluronic acid eye drops (HY) for dry eye syndromes (DES). METHODS: Randomized controlled trials (RCTs) comparing various concentrations of HY were searched in PubMed, Embase, Web of Science, Cochrane, SinoMed, CNKI, Wanfang Database, CQVIP, and Chinese journals databases between inception and July 2023. Pooled standardized mean differences (SMD) or weighted mean difference (WMD) with 95% confidence intervals (CI) from RCTs evaluating Schirmer's I test (SIT), corneal fluorescein staining score (CFS), tear breakup time (TBUT), DES score (DESS), and Ocular Surface Disease Index (OSDI) were calculated. Sensitivity analysis, Egger's test and Meta-regression analysis were performed for all indicators. RESULTS: We conducted a Meta-analysis of 10 RCTs that met the inclusion criteria, involving 1796 cases. High-concentrations group significantly improved the outcome of CFS according to random effects modelling (SMD, -3.37; 95%CI, -5.25 to -1.48; P=0.0005). The rest of the results were not statistically significant, including indicators such as SIT, TBUT, DESS and OSDI. CONCLUSION: For dry eyes with positive corneal staining, a high concentration of HY is recommended, whereas in other cases, a high concentration of HY does not offer a more pronounced advantage over a low concentration of HY in the treatment of dry eyes.

7.
Chem Commun (Camb) ; 60(51): 6560-6563, 2024 Jun 20.
Artículo en Inglés | MEDLINE | ID: mdl-38845542

RESUMEN

In this study, a Rh(III)-catalyzed C-H/N-H [4+2] annulation of oxadiazolones with iodonium ylides has been developed, which afforded a series of diverse fused-isoquinolines and fused-pyridines in moderate to high yields. These divergent synthesis protocols featured mild conditions, broad substrate scope, and functional-group compatibility. In addition, scale-up synthesis, related applications and preliminary mechanistic explorations were also accomplished.

8.
Environ Sci Technol ; 58(28): 12598-12608, 2024 Jul 16.
Artículo en Inglés | MEDLINE | ID: mdl-38904976

RESUMEN

Understanding the transport of 137Cs emitted during the Fukushima accident is challenging because the critical emissions that produced the high-deposition area are not adequately resolved in existing source terms. This paper presents an objective inverse reconstruction of these emissions by fusing atmospheric concentrations with a-priori emissions extracted from total depositions. This extraction, previously considered impossible for complex real-world accidents, is achieved by identifying the critical temporal formation process of depositions in the high-deposition area and estimating the corresponding emissions by using an atmospheric transport model. The reconstructed source term reveals two emission peaks from 10:00-11:00 and 14:00-15:00 on March 15, which agree with the in situ pressure measurements and accident analysis, suggesting that they came from pressure drops in the primary containment vessels of Units 3 and 2, respectively. This finding explains the environmental observations of spherical 137Cs particles. The source term also objectively and independently confirms the widely used reverse estimate. The corresponding 137Cs transport simulations better match the various observations than those produced by other source terms, proving that the two-peak emission creates a high-deposition area. The proposed method outperforms the direct fusion of deposition and atmospheric concentration observations, providing a robust tool for multiobservation fusion.


Asunto(s)
Contaminantes Radiactivos del Aire , Atmósfera , Radioisótopos de Cesio , Accidente Nuclear de Fukushima , Monitoreo de Radiación , Radioisótopos de Cesio/análisis , Contaminantes Radiactivos del Aire/análisis , Atmósfera/química , Japón , Modelos Teóricos
9.
Phys Rev E ; 109(3-1): 034125, 2024 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-38632761

RESUMEN

Besides its original spin representation, the Ising model is known to have the Fortuin-Kasteleyn (FK) bond and loop representations, of which the former was recently shown to exhibit two upper critical dimensions (d_{c}=4,d_{p}=6). Using a lifted worm algorithm, we determine the critical coupling as K_{c}=0.07770891(4) for d=7, which significantly improves over the previous results, and then study critical geometric properties of the loop Ising clusters on tori for spatial dimensions d=5 to 7. We show that as the spin representation, the loop Ising model has only one upper critical dimension at d_{c}=4. However, sophisticated finite-size scaling (FSS) behaviors, such as two length scales, two configuration sectors, and two scaling windows, still exist as the interplay effect of the Gaussian fixed point and complete-graph asymptotics. Moreover, using the loop-cluster algorithm, we provide an intuitive understanding of the emergence of the percolation-like upper critical dimension d_{p}=6 in the FK-Ising model. As a consequence, a unified physical picture is established for the FSS behaviors in all three representations of the Ising model above d_{c}=4.

10.
Front Chem ; 12: 1403696, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38680457

RESUMEN

The phenomenon of fire or even explosion caused by thermal runaway of lithium-ion power batteries poses a serious threat to the safety of electric vehicles. An in-depth study of the core-material thermal runaway reaction mechanism and reaction chain is a prerequisite for proposing a mechanism to prevent battery thermal runaway and enhance battery safety. In this study, based on a 24 Ah commercial Li(Ni0.6Co0.2Mn0.2)O2/graphite soft pack battery, the heat production characteristics of different state of charge (SOC) cathode and anode materials, the separator, the electrolyte, and their combinations of the battery were investigated using differential scanning calorimetry. The results show that the reaction between the negative electrode and the electrolyte is the main mode of heat accumulation in the early stage of thermal runaway, and when the heat accumulation causes the temperature to reach a certain critical value, the violent reaction between the positive electrode and the electrolyte is triggered. The extent and timing of the heat production behaviour of the battery host material is closely related to the SOC, and with limited electrolyte content, there is a competitive relationship between the positive and negative electrodes and the electrolyte reaction, leading to different SOC batteries exhibiting different heat production characteristics. In addition, the above findings are correlated with the battery failure mechanisms through heating experiments of the battery monomer. The study of the electro-thermal properties of the main materials in this paper provides a strategy for achieving early warning and suppression of thermal runaway in batteries.

11.
J Biomater Appl ; 39(1): 48-57, 2024 07.
Artículo en Inglés | MEDLINE | ID: mdl-38659361

RESUMEN

Electrospinning technology has recently attracted increased attention in the biomedical field, and preparing various cellulose nanofibril membranes for periodontal tissue regeneration has unique advantages. However, the characteristics of using a single material tend to make it challenging to satisfy the requirements for a periodontal barrier film, and the production of composite fibrous membranes frequently impacts the quality of the final fiber membrane due to the influence of miscibility between different materials. In this study, nanofibrous membranes composed of polylactic acid (PLA) and polycaprolactone (PCL) fibers were fabricated using side-by-side electrospinning. Different concentrations of gelatin were added to the fiber membranes to improve their hydrophilic properties. The morphological structure of the different films as well as their composition, wettability and mechanical characteristics were examined. The results show that PCL/PLA dual-fibrous composite membranes with an appropriate amount of gelatin ensures sufficient mechanical strength while obtaining improved hydrophilic properties. The viability of L929 fibroblasts was evaluated using CCK-8 assays, and cell adhesion on the scaffolds was confirmed by scanning electron microscopy and by immunofluorescence assays. The results demonstrated that none of the fibrous membranes were toxic to cells and the addition of gelatin improved cell adhesion to those membranes. Based on our findings, adding 30% gelatin to the membrane may be the most appropriate content for periodontal tissue regeneration, considering the scaffold's mechanical qualities, hydrophilic properties and biocompatibility. In addition, the PCL-gelatin/PLA-gelatin dual-fibrous membranes prepared using side-by-side electrospinning technology have potential applications for tissue engineering.


Asunto(s)
Adhesión Celular , Fibroblastos , Gelatina , Nanofibras , Poliésteres , Andamios del Tejido , Poliésteres/química , Gelatina/química , Nanofibras/química , Animales , Ratones , Andamios del Tejido/química , Línea Celular , Fibroblastos/citología , Membranas Artificiales , Ingeniería de Tejidos , Materiales Biocompatibles/química , Supervivencia Celular/efectos de los fármacos , Regeneración Tisular Guiada Periodontal/métodos , Ensayo de Materiales , Regeneración
13.
Life Sci ; 346: 122637, 2024 Jun 01.
Artículo en Inglés | MEDLINE | ID: mdl-38614305

RESUMEN

E74-like factor 3 (ELF3) is an important member of the E-twenty-six (ETS) transcription factor family. ELF3 is expressed in various types of cells and regulates a variety of biological behaviors, such as cell proliferation, differentiation, apoptosis, migration, and invasion, by binding to DNA to regulate the expression of other genes. In recent years, studies have shown that ELF3 plays an important role in the occurrence and development of many tumors and inflammation and immune related diseases. ELF3 has different functions and expression patterns in different tumors; it can function as a tumor suppressor gene or an oncogene, highlighting its dual effects of tumor promotion and inhibition. ELF3 also affects the levels of tumor immunity-related cytokines and is involved in the regulation and expression of multiple signaling pathways. In tumor therapy, ELF3 is a complex and multifunctional gene and has become a key focus of targeted treatment research. An in-depth study of the biological function of ELF3 can help to elucidate its role in biological processes and provide ideas and a basis for the development and clinical application of ELF3-related therapeutic methods. This review introduces the structure and physiological and cellular functions of the ELF3 gene, summarizes the mechanisms of action of ELF3 in different types of malignant tumors and its role in immune regulation, inflammation, etc., and discusses treatment methods for ELF3-related diseases, providing significant reference value for scholars studying the ELF3 gene and related diseases.


Asunto(s)
Proteínas de Unión al ADN , Neoplasias , Factores de Transcripción , Humanos , Neoplasias/genética , Neoplasias/patología , Factores de Transcripción/genética , Factores de Transcripción/metabolismo , Proteínas de Unión al ADN/genética , Animales , Proteínas Proto-Oncogénicas c-ets/genética , Proteínas Proto-Oncogénicas c-ets/metabolismo , Regulación Neoplásica de la Expresión Génica , Inflamación/genética
14.
Nephrology (Carlton) ; 29(5): 245-258, 2024 May.
Artículo en Inglés | MEDLINE | ID: mdl-38462235

RESUMEN

Autosomal dominant polycystic kidney disease (ADPKD) is the most common inherited cause of end-stage kidney disease (ESKD) worldwide. Guidelines for the diagnosis and management of ADPKD in Taiwan remains unavailable. In this consensus statement, we summarize updated information on clinical features of international and domestic patients with ADPKD, followed by suggestions for optimal diagnosis and care in Taiwan. Specifically, counselling for at-risk minors and reproductive issues can be important, including ethical dilemmas surrounding prenatal diagnosis and pre-implantation genetic diagnosis. Studies reveal that ADPKD typically remains asymptomatic until the fourth decade of life, with symptoms resulting from cystic expansion with visceral compression, or rupture. The diagnosis can be made based on a detailed family history, followed by imaging studies (ultrasound, computed tomography, or magnetic resonance imaging). Genetic testing is reserved for atypical cases mostly. Common tools for prognosis prediction include total kidney volume, Mayo classification and PROPKD/genetic score. Screening and management of complications such as hypertension, proteinuria, urological infections, intracranial aneurysms, are also crucial for improving outcome. We suggest that the optimal management strategies of patients with ADPKD include general medical care, dietary recommendations and ADPKD-specific treatments. Key points include rigorous blood pressure control, dietary sodium restriction and Tolvaptan use, whereas the evidence for somatostatin analogues and mammalian target of rapamycin (mTOR) inhibitors remains limited. In summary, we outline an individualized care plan emphasizing careful monitoring of disease progression and highlight the need for shared decision-making among these patients.


Asunto(s)
Fallo Renal Crónico , Riñón Poliquístico Autosómico Dominante , Humanos , Riñón Poliquístico Autosómico Dominante/diagnóstico , Riñón Poliquístico Autosómico Dominante/terapia , Riñón Poliquístico Autosómico Dominante/complicaciones , Taiwán/epidemiología , Tolvaptán , Riñón
15.
Appl Immunohistochem Mol Morphol ; 32(4): 169-175, 2024 Apr 01.
Artículo en Inglés | MEDLINE | ID: mdl-38478384

RESUMEN

OBJECTIVE: To assess the expression of early growth response 3 (EGR3) in normal skin and different types of skin tumors: cutaneous squamous cell carcinoma (cSCC), basal cell carcinoma (BCC), melanoma (MM), and cutaneous adnexal tumors containing sebaceous carcinoma (SC), trichoepithelioma (TE) and clear cell hidradenoma (CCH). BACKGROUND: EGR3, expressed in multiple organs, including skin, plays an important role in cell differentiation and tumor growth. Previous studies have shown that EGR3 suppresses tumor growth and is downregulated in various malignancies. However, its distribution in normal skin and its expression especially in skin tumors have not been studied. MATERIALS AND METHODS: Samples of normal cases (n = 4), cSCC (n = 12), BCC (n = 12), MM (n = 12), SC (n = 4), TE (n = 4), and CCH (n = 4) were collected from patients treated in our department between 2018 and 2023. Immunohistochemistry was used to investigate the expression of EGR3. The results were analyzed with the description of the staining pattern and the histochemical score. RESULTS: Immunohistochemical staining showed that EGR3 was uniquely expressed in normal skin in the granular layer and upper part of the stratum spinosum, as well as in sebaceous glands and hair follicles, but not in sweat glands. In skin cancers, BCC, SC, and TE showed positive EGR3 staining, whereas cSCC, MM, and CCH were negative. CONCLUSIONS: EGR3 has a specific expression pattern in normal skin and in skin tumors, which is important for the differential diagnosis of skin tumors, in particular for cSCC and sebaceous gland carcinoma.


Asunto(s)
Carcinoma Basocelular , Carcinoma de Células Escamosas , Melanoma , Neoplasias Basocelulares , Neoplasias Cutáneas , Humanos , Carcinoma Basocelular/metabolismo , Carcinoma de Células Escamosas/diagnóstico , Carcinoma de Células Escamosas/metabolismo , Melanoma/metabolismo , Piel/patología , Neoplasias Cutáneas/patología
16.
Am J Trop Med Hyg ; 110(4): 805-808, 2024 Apr 03.
Artículo en Inglés | MEDLINE | ID: mdl-38471180

RESUMEN

Tuberculous gumma (TG) is a rare type of cutaneous tuberculosis thought to occur as a result of the hematogenous spread of Mycobacterium tuberculosis, which is more common in immunosuppressed individuals. An 8-year-old boy presented with a 2-month history of multiple indolent enlarging ulcerated nodules on his left upper extremity. He had a past medical history of bacille Calmette-Guerin vaccine induced lupus vulgaris. Skin biopsy of the nodules showed granulomas and neutrophil-dominated purulent inflammation. Ziehl-Neelsen staining was negative, and the cultures were positive for M. tuberculosis. Furthermore, the M. tuberculosis complex was identified using metagenomic next-generation sequencing. Standard antitubercular therapy was started at full doses, and the skin lesions had significantly improved 3 months later. Here we review the literature since 2000 and describe the clinical and pathological features of TG.


Asunto(s)
Lupus Vulgar , Mycobacterium tuberculosis , Tuberculosis Cutánea , Masculino , Humanos , Niño , Tuberculosis Cutánea/diagnóstico , Tuberculosis Cutánea/tratamiento farmacológico , Lupus Vulgar/patología , Antituberculosos/uso terapéutico , Piel/patología
17.
Int Immunopharmacol ; 131: 111895, 2024 Apr 20.
Artículo en Inglés | MEDLINE | ID: mdl-38508096

RESUMEN

BACKGROUND: Kimura's disease (KD) is a rare chronic inflammatory disorder characterised by painless, deep subcutaneous nodules that most commonly affect the head and neck region of Asian men. Due to high relapse rates and side effects of current therapies, the treatment of KD is challenging. OBJECTIVES: To present a case of KD that was successfully treated with dupilumab and to review the literature with a focus on the evaluation of the efficacy and safety of dupilumab in KD. METHODS: A review of the available literature on the treatment of KD with dupilumab was performed and a new case was analyzed. To gain further insight into this promising therapy, literature review of 8 articles published between January 2016 and January 2024 were included in this study using the PubMed database. RESULTS: Our patient with KD was successfully treated with dupilumab 300 mg every 2 weeks, at an initial dose of 600 mg. The treatment was well tolerated. In the past, only nine patients with KD treated with dupilumab have been reported and reviewed, half of whom had failed prior treatment. All patients achieved significant efficacy after treatment with dupilumab, with no relapses during an average follow-up of 10.4 months (ranged from 4 to 16 months). CONCLUSION: Dupilumab may be an emerging alternative treatment option for KD patients. Larger randomized controlled studies are needed to confirm these findings.


Asunto(s)
Anticuerpos Monoclonales Humanizados , Enfermedad de Kimura , Humanos , Masculino , Anticuerpos Monoclonales Humanizados/efectos adversos , Anticuerpos Monoclonales Humanizados/uso terapéutico
18.
Eur J Clin Microbiol Infect Dis ; 43(5): 1031-1036, 2024 May.
Artículo en Inglés | MEDLINE | ID: mdl-38472521

RESUMEN

PURPOSE: We aimed to show the increasing incidence of invasive fungal infections due to Volvariella Volvacea in patients with immunosuppression. METHODS: We present a case of an invasive fungal infection caused by Volvariella volvacea, and summarize the clinical and pathological features based on this case and a review of the literature. RESULTS: A total of seven patients with IFIs due to Volvariella Volvacea have been reported in the literature. The majority of cases have been obtained between 2019 and 2022. Including our case, they all had acquired immunosuppression. The lung and brain were the most commonly affected organs. All eight of these patients received antifungal therapy, but five still died one to seven months after occurrences of IFIs. CONCLUSION: The incidence of invasive fungal infections due to Volvariella Volvacea is increasing in recent years. It mainly occurred in patients with immunosuppression, especially in patients with malignant hematological cancers, and increased mortality.


Asunto(s)
Antifúngicos , Infecciones Fúngicas Invasoras , Volvariella , Humanos , Volvariella/genética , Infecciones Fúngicas Invasoras/epidemiología , Infecciones Fúngicas Invasoras/tratamiento farmacológico , Infecciones Fúngicas Invasoras/microbiología , Infecciones Fúngicas Invasoras/mortalidad , Incidencia , Masculino , Antifúngicos/uso terapéutico , Huésped Inmunocomprometido , Persona de Mediana Edad , Femenino , Anciano
19.
Plant Physiol Biochem ; 209: 108547, 2024 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-38522132

RESUMEN

Drought has been considered the most restrictive environmental constraint on agricultural production worldwide. Photosynthetic carbohydrate metabolism is a critical biochemical process connected with crop production and quality traits. A pot experiment was carried out under four potassium (K) rates (0, 0.75, 1.5 and 2.25 g pot-1 of K, respectively) and two water regimes to investigate the role of K in activating defense mechanisms on sucrose metabolism against drought damage in sesame. The soil moisture contents are 75 ± 5% (well-watered, WW) and 45 ± 5% (drought stress, DS) of field capacity respectively. The results showed that DS plants without K application have lower activities of ribulose-1,5-bisphosphate carboxylase (Rubisco), sucrose phosphate synthase (SPS), soluble acid invertase (SAI), and chlorophyll content and higher activity of sucrose synthase (SuSy), which resulted in declined synthesis and distribution of photosynthetic products to reproductive organs. Under drought, there was a significant positive correlation between leaf sucrose metabolizing enzymes and sucrose content. Plants subjected to drought stress increased the concentrations of soluble sugar and sucrose to produce osmo-protectants and energy sources for plants acclimating to stress but decreased starch content. Conversely, K application enhanced the carbohydrate metabolism, biomass accumulation and partitioning, thereby contributing to higher seed oil and protein yield (28.8%-43.4% and 27.5%-40.7%) as compared to K-deficiency plants. The positive impacts of K application enhanced as increasing K rates, and it was more pronounced in drought conditions. Furthermore, K application upregulated the gene expression of SiMYB57, SiMYB155, SiMYB176 and SiMYB192 while downregulated SiMYB108 and SiMYB171 in drought conditions, which may help to alleviate drought susceptibility. Conclusively, our study illustrated that the enhanced photo-assimilation and translocation process caused by the changes in sucrose metabolism activities under K application as well as regulation of MYB gene expression contributes towards drought resistance of sesame.


Asunto(s)
Sequías , Sesamum , Sesamum/genética , Sesamum/metabolismo , Potasio/metabolismo , Metabolismo de los Hidratos de Carbono/genética , Hojas de la Planta/genética , Hojas de la Planta/metabolismo , Sacarosa/metabolismo , Expresión Génica
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