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9. Microwave-Mediated Synthesis and Characterization of Ca(OH) 2 Nanoparticles Destined for Geraniol Encapsulation.

Author

Tryfon, Panagiota, Kamou, Nathalie N., Mourdikoudis, Stefanos, Vourlias, George, Menkissoglu-Spiroudi, Urania, and Dendrinou-Samara, Catherine

Subjects
*CALCIUM hydroxide, *NANOPARTICLES, *PHYTOPATHOGENIC microorganisms, *NANOCAPSULES, *ESSENTIAL oils, *PEST control, *ANTIFUNGAL agents
Abstract

Nanotechnology presents promising opportunities for enhancing pest management strategies, particularly in protecting active ingredients to prolong their shelf life and effectiveness. Among different approaches, the combination of inorganic nanoparticles with active ingredients such as the main constituents of natural essential oils in one nanoarchitecture is challenging. In this study, hydrophobic calcium hydroxide nanoparticles coated with oleylamime [Ca(OH)2@OAm NPs] were synthesized using microwave-assisted synthesis. These primary NPs were physicochemically characterized and subsequently utilized to prepare nanocapsules (NCs) either alone (Ca NCs) and/or in combination with geraniol at different ratios of Ca(OH)2@OAm NPs and geraniol, i.e. 1:1 (CaGer1 NCs), 1:2 (CaGer2 NCs), and 1:3 (CaGer3 NCs), respectively. Among the formulations, the CaGer2 NCs demonstrated higher encapsulation efficiency (EE) and loading capacity (LC) of 95% and 20%, correspondingly. They exhibited a hydrodynamic size of 306 nm, a ζ-potential of −35 mV, and a monodisperse distribution. Release kinetics of geraniol from CaGer2 NCs indicated a pH-dependent slow release over 96 h at both 25 °C and 35 °C. In vitro antifungal assay against B. cinerea revealed a concentration-dependent activity, and the EC50 values for Ca(OH)2@OAm NPs, Ca NCs, and CaGer2 NCs were estimated to be 654 µg/mL, 395 µg/mL, and 507 µg/mL, respectively. These results underscore the potential of Ca-based nanoformulations to control plant pathogens, suggesting that while Ca NCs showcase potent antifungal attributes, the different architectures/structures play a critical role in the antifungal effectiveness of the nanoformulations that have to be explored further. [ABSTRACT FROM AUTHOR]

Published
2023
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14. Diagnosis of Induced Resistance State in Tomato Using Artificial Neural Network Models Based on Supervised Self-Organizing Maps and Fluorescence Kinetics

Author

Pantazi, Xanthoula Eirini, primary, Lagopodi, Anastasia L., additional, Tamouridou, Afroditi Alexandra, additional, Kamou, Nathalie Nephelie, additional, Giannakis, Ioannis, additional, Lagiotis, Georgios, additional, Stavridou, Evangelia, additional, Madesis, Panagiotis, additional, Tziotzios, Georgios, additional, Dolaptsis, Konstantinos, additional, and Moshou, Dimitrios, additional

Published
2022
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17. Biosolid-Amended Soil Enhances Defense Responses in Tomato Based on Metagenomic Profile and Expression of Pathogenesis-Related Genes

Author

Stavridou, Evangelia, primary, Giannakis, Ioannis, additional, Karamichali, Ioanna, additional, Kamou, Nathalie N., additional, Lagiotis, George, additional, Madesis, Panagiotis, additional, Emmanouil, Christina, additional, Kungolos, Athanasios, additional, Nianiou-Obeidat, Irini, additional, and Lagopodi, Anastasia L., additional

Published
2021
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22. Insights on the Evolution of Mycoparasitism from the Genome of Clonostachys rosea

Author

Karlsson, Magnus, Durling, Mikael Brandstrom, Choi, Jaeyoung, Kosawang, Chatchai, Lackner, Gerald, Tzelepis, Georgios D., Nygren, Kristiina, Dubey, Mukesh K., Kamou, Nathalie, Levasseur, Anthony, Zapparata, Antonio, Wang, Jinhui, Amby, Daniel Buchvaldt, Jensen, Birgit, Sarrocco, Sabrina, Panteris, Emmanuel, Lagopodi, Anastasia L., Poeggeler, Stefanie, Vannacci, Giovanni, Collinge, David B., Hoffmeister, Dirk, Henrissat, Bernard, Lee, Yong-Hwan, Jensen, Dan Funck, Karlsson, Magnus, Durling, Mikael Brandstrom, Choi, Jaeyoung, Kosawang, Chatchai, Lackner, Gerald, Tzelepis, Georgios D., Nygren, Kristiina, Dubey, Mukesh K., Kamou, Nathalie, Levasseur, Anthony, Zapparata, Antonio, Wang, Jinhui, Amby, Daniel Buchvaldt, Jensen, Birgit, Sarrocco, Sabrina, Panteris, Emmanuel, Lagopodi, Anastasia L., Poeggeler, Stefanie, Vannacci, Giovanni, Collinge, David B., Hoffmeister, Dirk, Henrissat, Bernard, Lee, Yong-Hwan, and Jensen, Dan Funck

Abstract

Clonostachys rosea is a mycoparasitic fungus that can control several important plant diseases. Here, we report on the genome sequencing of C. rosea and a comparative genome analysis, in order to resolve the phylogenetic placement of C. rosea and to study the evolution of mycoparasitism as a fungal lifestyle. The genome of C. rosea is estimated to 58.3 Mb, and contains 14,268 predicted genes. A phylogenomic analysis shows that C. Tosco clusters as sister taxon to plant pathogenic Fusarium species, with mycoparasitic/saprotrophic Tfichoderma species in an ancestral position. A comparative analysis of gene family evolution reveals several distinct differences between the included mycoparasites. Clonostachys rosea contains significantly more ATP-binding cassette (ABC) transporters, polyketide synthases, cytochrome P450 monooxygenases, pectin lyases, glucose-methanol-choline oxidoreductases, and lytic polysaccharide monooxygenases compared with other fungi in the Hypocreales. Interestingly, the increase of ABC transporter gene number in C. rosea is associated with phylogenetic subgroups B (multidrug resistance proteins) and G (pleiotropic drug resistance transporters), whereas an increase in subgroup C (multidrug resistance-associated proteins) is evident in Tfichoderma virens. In contrast with mycoparasitic Tfichoderma species, C. rosea contains very few chitinases. Expression of six group B and group G ABC transporter genes was induced in C. rosea during exposure to the Fusafium mycotoxin zearalenone, the fungicide Boscalid or metabolites from the biocontrol bacterium Pseudomonas chiororaphis. The data suggest that tolerance toward secondary metabolites is a prominent feature in the biology of C. rosea.

Published
2015
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23. Insights on the Evolution of Mycoparasitism from the Genome of Clonostachys rosea

Author

Karlsson, Magnus, primary, Durling, Mikael Brandström, additional, Choi, Jaeyoung, additional, Kosawang, Chatchai, additional, Lackner, Gerald, additional, Tzelepis, Georgios D., additional, Nygren, Kristiina, additional, Dubey, Mukesh K., additional, Kamou, Nathalie, additional, Levasseur, Anthony, additional, Zapparata, Antonio, additional, Wang, Jinhui, additional, Amby, Daniel Buchvaldt, additional, Jensen, Birgit, additional, Sarrocco, Sabrina, additional, Panteris, Emmanuel, additional, Lagopodi, Anastasia L., additional, Pöggeler, Stefanie, additional, Vannacci, Giovanni, additional, Collinge, David B., additional, Hoffmeister, Dirk, additional, Henrissat, Bernard, additional, Lee, Yong-Hwan, additional, and Jensen, Dan Funck, additional

Published
2015
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