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  1. Article ; Online: Coproduction of amino acids and biohythane from microalgae via cascaded hydrothermal and anaerobic process.

    Wu, Houkai / Huang, Sijie / Wang, Kaijun / Liu, Zhidan

    The Science of the total environment

    2023  Volume 872, Page(s) 162238

    Abstract: In search of the candidate for animal feed and clean energy, a new vision of algal biorefinery was firstly proposed to coproduce amino acids and biohythane via hydrothermal treatment and two-stage anaerobic fermentation. This study focused on the ... ...

    Abstract In search of the candidate for animal feed and clean energy, a new vision of algal biorefinery was firstly proposed to coproduce amino acids and biohythane via hydrothermal treatment and two-stage anaerobic fermentation. This study focused on the comprehensive analysis of amino acids recovered from Chlorella sp. and the subsequent biohythane production from microalgal residues. The content and recovery rate of amino acids were in the range of 2.07-27.62 g/100 g and 3.65 %-48.66 % with increasing temperature due to more cell wall disruptions. Furthermore, it was rich in essential amino acids for livestock, including leucine, arginine, isoleucine, valine and phenylalanine. A comparable hydrogen production (9 mL/g volatile solids (VS)) was reached at 70 °C and 90 °C, while it reduced to 5.84 mL/gVS at 150 °C. The group at 70 °C got the maximum methane generation of 311.9 mL/gVS, which was 16.67 %, 24.94 %, 38.38 % and 46.49 % higher than that of other groups. Microalgal residues at lower temperature contained more organics, which was the reason for the better biohythane production. The coproduction of amino acids and biohythane at 130 °C was favorable, which led to 43.71 % amino acids recovery and 93.82 mL biohythane production from per gVS of Chlorella sp. The improved microalgal biorefinery could provide an alternative way to mitigate the crisis of food and energy, but animal experimentations and techno-economic assessments should be considered for further study.
    MeSH term(s) Anaerobiosis ; Microalgae/metabolism ; Amino Acids/metabolism ; Chlorella/metabolism ; Fermentation ; Methane ; Biofuels ; Hydrogen/metabolism ; Biomass
    Chemical Substances Amino Acids ; Methane (OP0UW79H66) ; Biofuels ; Hydrogen (7YNJ3PO35Z)
    Language English
    Publishing date 2023-02-15
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2023.162238
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  2. Article ; Online: Instrumental activities of daily living function and cognitive status among Chinese older adults: a serial multiple mediation model.

    Huang, Sijie / Zhong, Wenjuan / Cheng, Qingzhou / Shuai, Yuxi / Zhu, Jiahui / Diao, Jiawei

    Frontiers in public health

    2024  Volume 12, Page(s) 1378979

    Abstract: Objective: This study aimed to develop and validate a serial multiple mediation model to investigate the association between instrumental activities of daily living (IADL) function and cognitive status among older adults while exploring the underlying ... ...

    Abstract Objective: This study aimed to develop and validate a serial multiple mediation model to investigate the association between instrumental activities of daily living (IADL) function and cognitive status among older adults while exploring the underlying mechanisms.
    Methods: This cross-sectional study involved 3,665 individuals aged 60 years and older who participated in the China Health and Retirement Longitudinal Survey (CHARLS). A serial multiple mediation model was utilized to explore the direct and indirect relationship between IADL function and cognitive status and whether sleep duration, social engagement, and depressive symptoms mediated this relationship.
    Results: Decreased IADL function was associated with worse cognitive status [effect = -0.620, 95% CI: (-0.692, -0.540)]. Sleep duration, social participation (SP), and depressive symptoms all acted as mediators in the relationship between IADL function and cognitive status.
    Conclusion: This study found both direct and indirect associations between IADL function and cognitive status, providing new insights into the effective prevention and intervention of cognitive decline among older adults.
    MeSH term(s) Humans ; Activities of Daily Living ; Male ; Aged ; Female ; Cross-Sectional Studies ; China ; Middle Aged ; Cognition/physiology ; Longitudinal Studies ; Depression/epidemiology ; Aged, 80 and over ; Cognitive Dysfunction ; Social Participation ; Mediation Analysis ; East Asian People
    Language English
    Publishing date 2024-05-02
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2711781-9
    ISSN 2296-2565 ; 2296-2565
    ISSN (online) 2296-2565
    ISSN 2296-2565
    DOI 10.3389/fpubh.2024.1378979
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  3. Article ; Online: Effect of Selenium Application on Growth, Antioxidative Capacity, and Nutritional Quality in Purple Lettuce Seedlings

    Huang, Sijie / Ying, Zhengzheng / Chen, Jian / Yang, Yuwen / Zhang, Jibing / Yang, Lifei / Liu, Mingqing

    Agronomy. 2023 June 21, v. 13, no. 7

    2023  

    Abstract: Selenium (Se) is involved in the growth and development of plants. More importantly, Se from plant foods is a primary source of Se intake for humans and animals. Improving the Se content in vegetables through biofortification is an effective way to solve ...

    Abstract Selenium (Se) is involved in the growth and development of plants. More importantly, Se from plant foods is a primary source of Se intake for humans and animals. Improving the Se content in vegetables through biofortification is an effective way to solve the hidden hunger induced by Se deficiency. This study demonstrated the effect of different exogenous Se application concentrations on the growth, antioxidative capacity, and nutritional quality of purple lettuce (Lactuca sativa var. crispa L. “Purple Rome”) at the seedling stage. The low Se application concentration (≤8 μM) significantly promoted the lettuce seedling growth. Conversely, the high Se application concentration (16 μM) inhibited the seedling growth and overproduced the reactive oxygen species in lettuce root tips, which caused oxidative damage to membrane lipids and cell death. Furthermore, the enzyme activities and gene expression of the antioxidant enzymes, superoxide dismutase-peroxidase, and catalase, were significantly increased under exogenous Se application. The exogenous Se application significantly increased the accumulation of nutrients in purple lettuce at the seedling stage. Remarkably, the exogenous Se application concentrations were significantly positively related to the Se and anthocyanin contents. The gene expression levels of chalcone synthase were positively correlated with the anthocyanin contents under exogenous Se application. This study contributes to the role of Se in lettuce growth and provides a reference for producing high-quality purple lettuce rich in Se and anthocyanins.
    Keywords Lactuca sativa var. crispa ; agronomy ; anthocyanins ; antioxidant activity ; biofortification ; catalase ; cell death ; gene expression ; hunger ; lettuce ; naringenin-chalcone synthase ; reactive oxygen species ; seedling growth ; seedlings ; selenium
    Language English
    Dates of publication 2023-0621
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article ; Online
    ZDB-ID 2607043-1
    ISSN 2073-4395
    ISSN 2073-4395
    DOI 10.3390/agronomy13071664
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  4. Article ; Online: Outcomes, responses, and prognostic analyses of intrathecal combined treatment for leptomeningeal metastasis from lung adenocarcinoma.

    Huang, Sijie / Kang, Xun / Wang, Ce / Zhang, Weichunbai / Jiang, Jing / Kang, Zhuang / Yang, Shoubo / Chen, Jinyi / Chen, Feng / Li, Wenbin

    Journal of cancer research and therapeutics

    2024  Volume 20, Issue 2, Page(s) 658–664

    Abstract: Background: Leptomeningeal metastasis (LM) is a severe lung cancer complication, with potentially fatal consequences. The use of intrathecal therapy (IT) combined with systemic therapy has shown promise as a treatment approach for LM. Thus, this study ... ...

    Abstract Background: Leptomeningeal metastasis (LM) is a severe lung cancer complication, with potentially fatal consequences. The use of intrathecal therapy (IT) combined with systemic therapy has shown promise as a treatment approach for LM. Thus, this study aimed to evaluate the features and responses to IT combined therapy and identify determinants affecting patients with leptomeningeal metastasis resulting from lung adenocarcinoma (LM-LA).
    Methods: A retrospective analysis of medical records from our hospital database was performed, covering from April 2018 to August 2022, for 37 patients diagnosed with LM-LA and treated with IT combined therapy. Patients who received IT combined therapy for LM-LA were evaluated for demographic characteristics, treatment efficacy, survival, and variables that impacted them.
    Results: The median overall survival (mOS) of 37 patients was 16.0 months, and the survival rates at 6 and 12 months were 75.7% and 35.1%, respectively. Among the 21 patients with LM-LA who received IT combined with tyrosine kinase inhibitors (TKIs), the mOS was 17.0 months, which was significantly longer than that of patients treated with IT combined with chemotherapy (7.0 months, P = 0.010) and the best supportive care (6.0 months, P = 0.001). However, no significant survival benefit was observed in patients treated with IT combined with TKIs when compared with those treated with IT combined with PD-1 (5.0 months, P = 0.249). Multivariate analysis indicated that the combination of TKIs was an independent favorable prognostic factor for patients with LM-LA.
    Conclusion: Combination treatment is regarded as an additional option for patients with LM-LA. Compared with other combination therapies in our study, IT combined with TKI therapy provided a better survival outcome for patients with LM-LA.
    MeSH term(s) Humans ; Male ; Female ; Middle Aged ; Adenocarcinoma of Lung/drug therapy ; Adenocarcinoma of Lung/pathology ; Adenocarcinoma of Lung/secondary ; Adenocarcinoma of Lung/mortality ; Retrospective Studies ; Lung Neoplasms/drug therapy ; Lung Neoplasms/pathology ; Lung Neoplasms/mortality ; Injections, Spinal ; Prognosis ; Aged ; Antineoplastic Combined Chemotherapy Protocols/therapeutic use ; Adult ; Survival Rate ; Meningeal Neoplasms/secondary ; Meningeal Neoplasms/drug therapy ; Meningeal Neoplasms/mortality ; Treatment Outcome ; Protein Kinase Inhibitors/therapeutic use ; Protein Kinase Inhibitors/administration & dosage ; Meningeal Carcinomatosis/secondary ; Meningeal Carcinomatosis/drug therapy ; Meningeal Carcinomatosis/mortality ; Combined Modality Therapy ; Aged, 80 and over
    Chemical Substances Protein Kinase Inhibitors
    Language English
    Publishing date 2024-04-30
    Publishing country India
    Document type Journal Article
    ZDB-ID 2187633-2
    ISSN 1998-4138 ; 0973-1482
    ISSN (online) 1998-4138
    ISSN 0973-1482
    DOI 10.4103/jcrt.jcrt_2071_23
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  5. Article: Pilot electrochemical prevention of reclaimed water irrigation clogging: Function interactions and microbial metabolism

    Huang, Sijie / Zhang, Ning / Li, Yunkai / Song, Peng / Liu, Zhidan

    Journal of cleaner production. 2022 Feb. 15, v. 336

    2022  

    Abstract: Clogging is a critical issue for unconventional water irrigation. Here, we report an in situ pilot electrochemical device to efficient prevent and control clogging induced from a reclaimed water drip irrigation system. The low-voltage electrochemical up- ... ...

    Abstract Clogging is a critical issue for unconventional water irrigation. Here, we report an in situ pilot electrochemical device to efficient prevent and control clogging induced from a reclaimed water drip irrigation system. The low-voltage electrochemical up-flow reactor (905 L) was connected with a drip irrigation performance test platform setting up light and heavy clogging degrees for the continuous operation over 624 h. The fluctuation of water quality indicators (pH, alkalinity, hardness, Cl⁻) displayed positive treatment effect on chemical clogging, and the sterilization rate was as high as 98.42%. Treated water circulated the whole system that maintained a discharge ratio variation (Dra) of 84.7%, and Christiansen uniformity coefficient (CU) of 95.4% in light clogging meanwhile recovered 32.5% and 14.9% in heavy clogging, respectively. Canonical Correspondence Analysis (CCA) revealed interactions between water quality indices and microorganisms in reclaimed water. Especially, Cl⁻ was closely related to microorganisms at the initial stage (<336 h) while pH and alkalinity occupied an obvious effect at the 672 h. In addition, Kyoto Encyclopedia of Genes and Genomes (KEGG) database systematically reflected the metabolic shift of planktonic cells under electrochemical treatment, further revealing antimicrobial and antifouling mechanisms of bio-clogging. Downregulation of biosynthesis of oxidative phosphorylation, ABC transporters and ribosomes indicated the gradually reduced cytoactive of microorganisms. The dramatic downregulation of cell motility evidenced the weakened ability of cells to translocate onto a solid substrate surface.
    Keywords alkalinity ; biosynthesis ; cell movement ; correspondence analysis ; databases ; electrochemistry ; microirrigation ; oxidative phosphorylation ; pH ; plankton ; ribosomes ; wastewater irrigation ; wastewater treatment
    Language English
    Dates of publication 2022-0215
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0959-6526
    DOI 10.1016/j.jclepro.2022.130436
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  6. Article: Hythane and methane production in a multistage anaerobic hythane reactor (MAHR): Stage separation, functional microbe selection, thermodynamics, and kinetics

    Tang, Shuai / Huang, Sijie / Jiang, Weizhong / Lu, Haifeng / Zhang, Yuanhui / Zhou, Bo / Si, Buchun

    Elsevier Ltd Energy conversion and management. 2022 Oct. 15, v. 270

    2022  

    Abstract: The establishment of a multistage anaerobic hythane reactor (MAHR) that integrates biohythane and biomethane production into a single reactor demonstrates promising potential for simultaneously producing hythane and methane. However, separating hythane ... ...

    Abstract The establishment of a multistage anaerobic hythane reactor (MAHR) that integrates biohythane and biomethane production into a single reactor demonstrates promising potential for simultaneously producing hythane and methane. However, separating hythane and methane production in a single reactor remains a challenge, and stages separation in MAHR system is not well understood. Moreover, the necessity to heating pretreatment of the inoculum for acidogenesis and hythane production is impractical for the full-scale application of MAHR due to the extra economic and energy input. Therefore, heating preselected and not preselected inocula were adopted in this study to reveal the biofuel production performance and the mechanisms of stage separation in MAHRs with different inoculum strategies. Results indicated that stable hythane and methane production of MAHR without inoculum preselection could be achieved and maintained after a longer start-up period compared to the preselected inoculum condition. A comparable hythane and methane production and organics conversion performance were observed in the two MAHRs during stable period, in which hythane with a suitable hydrogen concentration (5%-25%) and methane with a high concentration (57%-75%) were produced. Supported by the more stable microbial correlation networks, MAHR without inoculum preselection suggested a higher methane production rate (13.5 ± 2.8 L/L/d) and was resistant to organic loading shock (80 g COD/L/d). Furthermore, microbial diversity, thermodynamics, and kinetic analysis revealed that the stage separation was highly dependent on microbial dynamics, metabolism characteristics, and reactor configurations. Acetogens (Desulfovibrio and Syntrophobacter) and aceticlastic methanogens (Methanosaeta and Methanosarcina) were more likely to wash out form the hythane production zone (Mh) and be enriched in the methane production zone (Mm) compared to acidogens (Streptococcus, Rikenellaceae_RC9_gut_group, Bacteroides, etc.) and hydrogenotrophic methanogens (Methanobacterium and Methanobrevibacter). The results from this study deepened the understanding of functional microbial community dynamics and stage separation mechanisms, which provided insights into the design, start-up, and full-scale operation of MAHR.
    Keywords Bacteroides ; Desulfovibrio ; Methanobacterium ; Methanobrevibacter ; Methanosaeta ; Methanosarcina ; Streptococcus ; Syntrophobacter ; acetogens ; administrative management ; biogas ; energy conversion ; fuel production ; hydrogen ; inoculum ; kinetics ; metabolism ; methane ; methane production ; methanogens ; microbial communities
    Language English
    Dates of publication 2022-1015
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2000891-0
    ISSN 0196-8904
    ISSN 0196-8904
    DOI 10.1016/j.enconman.2022.116214
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  7. Article ; Online: Differentially Expressed Genes in Nasopharyngeal Carcinoma Tissues and Their Correlation with Recurrence and Metastasis of Nasopharyngeal Carcinoma.

    Yue, Haiying / Zhu, Huijun / Luo, Danjing / Du, Qinghua / Xie, Yiting / Huang, Sijie / Liu, Wenqi

    publication RETRACTED

    Computational and mathematical methods in medicine

    2022  Volume 2022, Page(s) 1941412

    Abstract: In this study, bioinformatics tools were used to identify key genes to study the molecular mechanism of nasopharyngeal carcinoma (NPC) development and to explore the correlation of these key genes with the recurrence and metastasis of NPC. The GSE61218 ... ...

    Abstract In this study, bioinformatics tools were used to identify key genes to study the molecular mechanism of nasopharyngeal carcinoma (NPC) development and to explore the correlation of these key genes with the recurrence and metastasis of NPC. The GSE61218 microarray dataset obtained from the Gene Expression Omnibus Database (GEO) was used. The limma R package was used to screen differentially expressed genes (DEGs) between NPC and normal nasopharyngeal (NP) tissues. KEGG functional enrichment was performed on these selected DEGs. Protein-protein interaction (PPI) networks were constructed using Cytoscape software to identify key node proteins. The NPC-metastasis microarray dataset GSE103611 was obtained from GEO to analyze the expression of DEGs in NPC metastasis. A total of 239 DEGs were identified. DEGs were mainly enriched in oocyte maturation-related pathways, cytokine-related pathways, cell cycle-related pathways, cancer-related pathways, and homologous recombination-related pathways. In addition, the top 10 nodes with the higher degree in the DEG PPI network were as follows: CDK1, CCNB2, BUB1, CCNA2, AURKB, BUB1B, MAD2L1, NDC80, BIRC5, and CENPF. The results indicated that DEGs may be involved in the pathogenesis of NPC by regulating cell cycle and mitosis, which can be used as molecular biomarkers for the diagnosis of NPC. In addition, we identified 87 DEGs with FC > 2 and
    MeSH term(s) Biomarkers, Tumor/genetics ; Computational Biology/methods ; Gene Expression Profiling/methods ; Gene Expression Regulation, Neoplastic ; Gene Regulatory Networks ; Humans ; Nasopharyngeal Carcinoma/genetics ; Nasopharyngeal Neoplasms/genetics
    Chemical Substances Biomarkers, Tumor
    Language English
    Publishing date 2022-04-25
    Publishing country United States
    Document type Journal Article ; Retracted Publication
    ZDB-ID 2252430-7
    ISSN 1748-6718 ; 1748-670X ; 1027-3662
    ISSN (online) 1748-6718
    ISSN 1748-670X ; 1027-3662
    DOI 10.1155/2022/1941412
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 6373: Show issues Location:
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    ab Jg. 2022: Lesesaal (EG)

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  8. Article: Dietary B vitamins and glioma: A case-control study based on Chinese population.

    Zhang, Weichunbai / Jiang, Jing / Kang, Xun / Wang, Ce / Chen, Feng / Zhang, Botao / Li, Shenglan / Huang, Sijie / Li, Wenbin

    Frontiers in nutrition

    2023  Volume 10, Page(s) 1122540

    Abstract: Background: Dietary antioxidants have long been thought to be likely to prevent the development of gliomas. Previous studies have reported vitamin A, C, and E protective effects against gliomas. B vitamins, one of the main vitamins in the diet, are ... ...

    Abstract Background: Dietary antioxidants have long been thought to be likely to prevent the development of gliomas. Previous studies have reported vitamin A, C, and E protective effects against gliomas. B vitamins, one of the main vitamins in the diet, are closely related to human health, but the association with gliomas has rarely been reported.
    Objective: This study aimed to evaluate the relationship between five B vitamins and glioma.
    Methods: In this Chinese population-based case-control study, 506 glioma cases and 506 matched (age and sex) controls were included. The dietary intake of study participants was assessed using a valid 111-item food frequency questionnaire. The intake of five B vitamins was calculated based on participants' dietary information from the food frequency questionnaire. The logistic regression model was used to examine the association between B vitamins and glioma, and the restriction cubic spline evaluated the dose-response relationship between the two.
    Results: After adjusting for confounding factors, thiamine (OR = 0.09, 95%CI: 0.05-0.20), riboflavin (OR = 0.12, 95%CI: 0.06-0.25), nicotinic acid (OR = 0.24, 95%CI: 0.12-0.47), folate (OR = 0.07, 95%CI: 0.03-0.15) and biotin (OR = 0.14, 95%CI: 0.07-0.30) in the highest tertile were associated with a significantly decreased risk of glioma compared with the lowest tertile. The results of thiamine and biotin in glioma with different pathological types and grades were different. The restricted cubic spline function showed significant dose-response relationships between the intake of five B vitamins and the risk of glioma. When B vitamins exceeded a specific intake, the risk of glioma did not change.
    Conclusion: Our study suggests that higher dietary intake of thiamine, riboflavin, nicotinic acid, and folate are associated with a decreased risk of glioma, but the results of biotin are not consistent among different populations. In the future, prospective studies should be conducted better to validate the effects of B vitamins on gliomas.
    Language English
    Publishing date 2023-03-02
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2776676-7
    ISSN 2296-861X
    ISSN 2296-861X
    DOI 10.3389/fnut.2023.1122540
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  9. Article: Effects of Organic Fertilization Rates on Surface Water Nitrogen and Phosphorus Concentrations in Paddy Fields

    Liu, Mingqing / Wu, Yuncheng / Huang, Sijie / Yang, Yuwen / Li, Yan / Wang, Lei / Xi, Yunguan / Zhang, Jibing / Chen, Qiuhui

    Agriculture (Basel). 2022 Sept. 14, v. 12, no. 9

    2022  

    Abstract: Inappropriate organic fertilizer application may cause serious environmental risks, especially nitrogen (N) and phosphorus (P) losses. To achieve a win–win for high yield and environmental protection in organic agriculture, it was essential to ... ...

    Abstract Inappropriate organic fertilizer application may cause serious environmental risks, especially nitrogen (N) and phosphorus (P) losses. To achieve a win–win for high yield and environmental protection in organic agriculture, it was essential to demonstrate the relationship between the organic fertilizer input, rice yields, and risks of N and P losses. Based on a rice and green manure cropping rotation field experiment in the Yangtze River Delta of China, the effects of organic fertilization rates on the dynamics of surface water N and P concentrations and rice grain yields were determined. The results showed that the N (total N, ammonium-nitrogen, nitrate-nitrogen) and P (total P and dissolved P) concentrations in surface water immediately and greatly reached the highest values 1 day after basal fertilization and topdressing fertilization. Then, the N and P concentrations sharply decreased and were maintained at a relatively low level. The initial 3 and 7 days after organic fertilization were the high-risk periods for controlling N and P runoff losses. The surface water N and P concentrations had a positive correlation with the organic fertilization rate in high-risk periods. Besides, the effects of organic fertilization on surface water P concentrations existed longer than those of N concentrations. The rice grain yields increased with the increase in organic fertilization rates, but high organic fertilizer input (>225 kg N per hectare) did not increase the grain yield. Meanwhile, the high organic fertilizer input had the highest risks for N and P losses. Therefore, in organic rice farming, organic fertilization rates with 150~200 kg N per hectare are the optimal organic fertilizer input, with relatively high grain yields and low N and P losses.
    Keywords agriculture ; ammonium nitrogen ; environmental protection ; fertilizer application ; field experimentation ; grain yield ; green manures ; nitrate nitrogen ; nitrogen ; organic fertilizers ; organic production ; paddies ; phosphorus ; rice ; river deltas ; runoff ; surface water ; total nitrogen ; China ; Yangtze River
    Language English
    Dates of publication 2022-0914
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    ZDB-ID 2651678-0
    ISSN 2077-0472
    ISSN 2077-0472
    DOI 10.3390/agriculture12091466
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  10. Article ; Online: Thymol Induces Cell Death of Fusarium oxysporum f. sp. niveum via Triggering Superoxide Radical Accumulation and Oxidative Injury In Vitro

    Hao, Yini / Zhang, Jiao / Sun, Changwei / Chen, Xuenai / Wang, Yuxiao / Lü, Haiyan / Chen, Jian / Shi, Zhiqi / Zhang, Li / Yang, Lifei / Huang, Sijie

    Agronomy. 2023 Jan. 06, v. 13, no. 1

    2023  

    Abstract: Fusarium oxysporum f. sp. niveum (FON) causes watermelon wilt that is one of the major disease-causing yield losses of watermelon. Sustainable development of agriculture requires controlling watermelon wilt disease with good environmental performance. ... ...

    Abstract Fusarium oxysporum f. sp. niveum (FON) causes watermelon wilt that is one of the major disease-causing yield losses of watermelon. Sustainable development of agriculture requires controlling watermelon wilt disease with good environmental performance. One important approach is to identify environmental-friendly compounds with inhibitory activity against FON. Thymol is a plant-derived compound that is safe for ecology. Little is known about the application of thymol in agriculture. In this study, we studied the inhibitory activity of thymol against FON by using morphological, physiological, and histochemical approaches. Thymol significantly inhibited colony diameter of FON in a dose-dependent manner, with EC₅₀ at 21 µg/mL. Thymol at 10, 21, and 35 µg/mL decreased the fresh weight of FON mycelia by 29.0%, 50.6%, and 69.5%, respectively. Microscopic observation revealed irregular damage and loss of shape of mycelia upon thymol exposure. Thymol induced the accumulation of superoxide radical in mycelial cells and accompanied increased activity of antioxidative enzymes (SOD, superoxide dismutase; CAT, catalase). Thymol induced membrane permeability was indicated by lipid peroxidation and electrolyte leakage (increased by 29–58%) in mycelial cells. These results suggested that thymol induced oxidative damage in mycelia, which may be one of the possible reasons for thymol-induced mycelial cell death observed with fluorescent detection. Thymol decreased the production of conidia and inhibited the germination of conidia. Thymol induced superoxide radical accumulation, lipid peroxidation, and cell death in conidia as well. All of these results revealed the inhibitory activity of thymol against FON, which may have resulted from the superoxide radical-induced oxidative injury in both conidia and mycelia of FON.
    Keywords Fusarium oxysporum f. sp. niveum ; agronomy ; catalase ; cell death ; conidia ; dose response ; ecology ; electrolyte leakage ; environmental performance ; fluorescence ; germination ; lipid peroxidation ; membrane permeability ; microscopy ; mycelium ; oxidative toxicity ; superoxide anion ; superoxide dismutase ; sustainable development ; thymol ; vascular wilt ; watermelons
    Language English
    Dates of publication 2023-0106
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article ; Online
    ZDB-ID 2607043-1
    ISSN 2073-4395
    ISSN 2073-4395
    DOI 10.3390/agronomy13010189
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