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Porsche FM, Franck J, Schmitt A. New Insights into the Anti-Oomycete Mechanisms of a Leaf Extract from Glycyrrhiza glabra Against Pseudoperonospora cubensis. PHYTOPATHOLOGY 2024; 114:348-358. [PMID: 37698503 DOI: 10.1094/phyto-01-23-0037-r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/13/2023]
Abstract
Cucurbit downy mildew, caused by Pseudoperonospora cubensis, is responsible for high economic losses worldwide in cucumber production. Synthetic pesticides or copper-based products are still important tools to manage the disease. However, the pathogen has developed resistance against common fungicides rather quickly, and there is a need for alternative plant-protecting agents. Glycyrrhiza glabra leaf extract is known for its antifungal activity and was highly effective in former bioassays and semi-commercial trials against downy mildew of cucumber. To elucidate the active ingredients and the mode of action, licorice leaf extract was here fractionated into five fractions (F1 to F5) with a newly developed and optimized separation process via flash chromatography. The crude extract (P1) and fraction F1 inhibited the zoospore release from sporangia, the zoospore germination, and germ tube development of P. cubensis almost completely on two cucumber cultivars, one tolerant and one susceptible to the pathogen. Infestation rates were reduced between 73 and 96%. F1 contained three previously reported antifungal polyphenols: glabranin, pinocembrin, and licoflavanon. Here, we report an additional new compound, naringenin. Furthermore, F5 is found here to show some protective effects against P. cubensis, based on either direct fungicidal or indirect effects via the host plant. The presented results show that licorice leaf extract can serve as an alternative plant protection agent, able to manage P. cubensis infestation on cucumber cultivars with differing levels of susceptibility by interfering with important early stages in the pathogen development.
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Affiliation(s)
- Franziska M Porsche
- Biologischer Pflanzenschutz, Julius Kühn-Institut Bundesforschungsinstitut für Kulturpflanzen Standort Darmstadt, Schwaabenheimer Str. 101, Dossenheim, 69221, Germany
| | - Jeanine Franck
- Biologischer Pflanzenschutz, Julius Kühn-Institut Bundesforschungsinstitut für Kulturpflanzen Standort Darmstadt, Schwaabenheimer Str. 101, Dossenheim, 69221, Germany
| | - Annegret Schmitt
- Biologischer Pflanzenschutz, Julius Kühn-Institut Bundesforschungsinstitut für Kulturpflanzen Standort Darmstadt, Schwaabenheimer Str. 101, Dossenheim, 69221, Germany
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Docimo T, Celano R, Lambiase A, Di Sanzo R, Serio S, Santoro V, Coccetti P, Russo M, Rastrelli L, Piccinelli AL. Exploring Influence of Production Area and Harvest Time on Specialized Metabolite Content of Glycyrrhiza glabra Leaves and Evaluation of Antioxidant and Anti-Aging Properties. Antioxidants (Basel) 2024; 13:93. [PMID: 38247517 PMCID: PMC10812728 DOI: 10.3390/antiox13010093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 01/03/2024] [Accepted: 01/10/2024] [Indexed: 01/23/2024] Open
Abstract
Calabrian Glycyrrhiza glabra is one of the most appreciated licorice varieties worldwide, and its leaves are emerging as a valuable source of bioactive compounds. Nevertheless, this biomass is usually discarded, and its valorization could contribute to boost the economic value of the licorice production chain. In this study, the effects of production area and harvest time on the specialized metabolite content of G. glabra leaves (GGL) and also the antioxidant and anti-aging properties are evaluated to explore the potential of this untapped resource and to select the most optimal harvesting practices. GGL exhibited high levels of specialized metabolites (4-30 g/100 g of dry leaf) and the most abundant ones are pinocembrin, prenylated flavanones (licoflavanone and glabranin), and prenylated dihydrostilbenes. Their levels and antioxidant capacity in extracts are influenced by both production area and harvest time, showing a decisive role on specialized metabolites accumulation. Interestingly, GGL extracts strongly attenuate the toxicity of α-synuclein, the intracellular reactive oxygen species (ROS) content, and cellular senescence on Saccharomyces cerevisiae expressing human α-synuclein model, showing great potential to prevent aging and age-related disorders. These results provide insights into the phytochemical dynamics of GGL, identifying the best harvesting site and period to obtain bioactive-rich sources with potential uses in the food, nutraceutical, and pharmaceutical sectors.
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Affiliation(s)
- Teresa Docimo
- Institute of Bioscience and BioResources, National Research Council, 80055 Portici, Italy;
| | - Rita Celano
- Department of Pharmacy, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Italy; (S.S.); (V.S.); (L.R.); (A.L.P.)
- National Biodiversity Future Center (NBFC), 90133 Palermo, Italy; (A.L.); (P.C.)
| | - Alessia Lambiase
- National Biodiversity Future Center (NBFC), 90133 Palermo, Italy; (A.L.); (P.C.)
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, 20126 Milano, Italy
| | - Rosa Di Sanzo
- Department of Agriculture Science, Food Chemistry, Safety and Sensoromic Laboratory (FoCuSS Lab), University of Reggio Calabria, Via Salita Melissari, 89124 Reggio Calabria, Italy; (R.D.S.); (M.R.)
| | - Simona Serio
- Department of Pharmacy, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Italy; (S.S.); (V.S.); (L.R.); (A.L.P.)
- PhD Program in Drug Discovery and Development, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Italy
| | - Valentina Santoro
- Department of Pharmacy, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Italy; (S.S.); (V.S.); (L.R.); (A.L.P.)
- National Biodiversity Future Center (NBFC), 90133 Palermo, Italy; (A.L.); (P.C.)
| | - Paola Coccetti
- National Biodiversity Future Center (NBFC), 90133 Palermo, Italy; (A.L.); (P.C.)
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, 20126 Milano, Italy
| | - Mariateresa Russo
- Department of Agriculture Science, Food Chemistry, Safety and Sensoromic Laboratory (FoCuSS Lab), University of Reggio Calabria, Via Salita Melissari, 89124 Reggio Calabria, Italy; (R.D.S.); (M.R.)
| | - Luca Rastrelli
- Department of Pharmacy, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Italy; (S.S.); (V.S.); (L.R.); (A.L.P.)
- National Biodiversity Future Center (NBFC), 90133 Palermo, Italy; (A.L.); (P.C.)
| | - Anna Lisa Piccinelli
- Department of Pharmacy, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Italy; (S.S.); (V.S.); (L.R.); (A.L.P.)
- National Biodiversity Future Center (NBFC), 90133 Palermo, Italy; (A.L.); (P.C.)
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Xu X, Zhang H, Jin S, Zhu Y, Lv Z, Cui P, Lu G. Three Licorice Extracts' Impact on the Quality of Fresh-Cut Sweet Potato ( Ipomoea batatas (L.) Lam) Slices. Foods 2024; 13:211. [PMID: 38254512 PMCID: PMC10815067 DOI: 10.3390/foods13020211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 01/01/2024] [Accepted: 01/05/2024] [Indexed: 01/24/2024] Open
Abstract
The quality of fresh-cut produce, particularly sweet potatoes, is crucial for their value. Licorice extract is an optional additive in fresh-cut sweet potatoes. This study examined the impact of three licorice extracts (licorice acid, LA; licorice flavonoids, LF; and licorice polysaccharides, LP) on the quality of fresh-cut sweet potato slices (FCSPSs) for one week of storage. After one week of storage, the extracts showed varying effects on FCSPSs. LA and LF treatments reduced the area proportion of browning (APB), while LP treatments increased APB and decreased L* values. Antioxidant experiments revealed that LP treatments increased PPO and POD activity while reducing SOD activity. The concentrations of the three licorice extracts showed a strong negative correlation with SOD activity. In conclusion, LP harmed the appearance and antioxidant qualities of FCSPSs. LA and LF may be suitable additive components for FCSPSs, and 30 mg/mL LA and LF treatments were found to maintain the appearance and texture quality of FCSPSs during storage. Therefore, careful consideration should be given when using LP as a food additive for FCSPSs.
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Affiliation(s)
| | | | | | | | | | | | - Guoquan Lu
- The Key Laboratory for Quality Improvement of Agricultural Products of Zhejiang Province, Institute of Root and Tuber Crops, College of Advanced Agricultural Sciences, Zhejiang A&F University, Hangzhou 311300, China; (X.X.); (H.Z.); (Y.Z.); (Z.L.); (P.C.)
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Papaioannou EH, Bazzarelli F, Mazzei R, Giannakopoulos V, Roberts MR, Giorno L. Membrane Cascade Fractionation of Tomato Leaf Extracts-Towards Bio-Based Crop Protection. MEMBRANES 2023; 13:855. [PMID: 37999341 PMCID: PMC10673455 DOI: 10.3390/membranes13110855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 10/21/2023] [Accepted: 10/23/2023] [Indexed: 11/25/2023]
Abstract
Promising initial results from the use of membrane-fractionated extracts of tomato leaf as crop protection agents have recently been reported. This paper provides additional evidence from larger scale experiments that identify an efficient pipeline for the separation of tomato leaf extracts to generate a fraction with significant defence elicitor activity. A UF tubular membrane 150 kDa, with an internal diameter of 5 mm, proved appropriate for initial extract clarification, whereas afterwards a UF 10 kDa and three NF membranes (200-800 Da) in sequence were evaluated for the subsequent fractionation of this tomato extract. The compositions of sugars, proteins and total biophenols were changed in these fractions with respect to the initial extract. The initial extract ratio of sugars: proteins: biophenols was 1:0.047:0.052, whereas for the retentate of the 800 Da NF membrane, which has the higher crop protection activity, this ratio was 1:0.06:0.1. In this regard, it appears that the main crop protection effect in this fraction was due to the sugars isolated. It was found that with the appropriate membrane cascade selection (UF 150 kDa, UF 10 kDa and NF 800 Da) it was possible to produce (easily and without the need of additional chemicals) a fraction that has significant activity as an elicitor of disease resistance in tomato, whereas the remaining fractions could be used for other purposes in a biorefinery. This is very promising for the wider application of the proposed approach for the relatively easy formulation of bio-based aqueous streams with bio-pesticide activities.
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Affiliation(s)
| | - Fabio Bazzarelli
- National Research Council of Italy, Institute on Membrane Technology, CNR-ITM, Via P. Bucci, 87036 Rende, Italy (L.G.)
| | - Rosalinda Mazzei
- National Research Council of Italy, Institute on Membrane Technology, CNR-ITM, Via P. Bucci, 87036 Rende, Italy (L.G.)
| | | | - Michael R. Roberts
- Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK
| | - Lidietta Giorno
- National Research Council of Italy, Institute on Membrane Technology, CNR-ITM, Via P. Bucci, 87036 Rende, Italy (L.G.)
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Troussieux S, Gilgen A, Souche JL. Fighting Tomato Fungal Diseases with a Biocontrol Product Based on Amoeba Lysate. PLANTS (BASEL, SWITZERLAND) 2023; 12:3603. [PMID: 37896066 PMCID: PMC10609735 DOI: 10.3390/plants12203603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 10/12/2023] [Accepted: 10/12/2023] [Indexed: 10/29/2023]
Abstract
New solutions to reduce the use of chemical pesticides to combat plant diseases and to meet societal and political demands are needed to achieve sustainable agriculture. Tomato production, both in greenhouses and in open fields, is affected by numerous pathogens. The aim of this study is to assess the possibility of controlling both late blight and powdery mildew in tomatoes with a single biocontrol product currently under registration. The biocontrol product AXP12, based on the lysate of Willaertia magna C2c Maky, has already proved its efficacy against downy mildew of grapevine and potato late blight. Its ability to elicit tomato defenses and its efficacy in the greenhouse and in the field were tested. This study establishes that AXP12 stimulates the tomato genes involved in plant defense pathways and has the capacity to combat in greenhouse and field both late blight (Phytophtora infestans) and powdery mildew (Oidium neolycopersici and Leveillula taurica) of tomato.
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