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Subject: search.filters.subject.Talaromyces

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    Control of postharvest fungal decay in papaya fruits by chitosan-carboxymethyl cellulose coating incorporated with essential oilsãnd potassium sorbate
    (2023-12-01)
    Nanasombat, Suree
    ;
    Phunpruch, Saranya
    The objective of this study was to evaluate the effect of plant essential oils in combination withãcid salts for development of edible coating formulations. Firstly,ãntifungalãctivities of cinnamon (Cinnamomum verum), clove (Syzygiumãromaticum),ãnd collaãromatica Roxb. (Homalomenaãromatica) oilsãndãcid salts (ammonium carbonate, potassium metabisulfite,ãnd potassium sorbate) were studied. Cinnamonãnd clove oilsãt 0.0125-0.2% minimum inhibitory concentration (MIC) were effective to inhibit growth of Aspergillus flavus TISTR 3041, Penicillium citrinum TISTR 3437,ãnd 2 mold strains, Talaromyces sp. P2D4ãnd Aspergillus sp. P8A6 isolated from papaya fruits, while those salts showedãntifungalãctivityãt 0.5-8% MIC. Combination of cinnamon or clove oil with potassium sorbate showed the synergistic effectãgainst Talaromyces sp. P2D4. Effect of cinnamon or clove oil combined with potassium sorbate in 0.1% chitosanãnd 0.25% carboxymethyl cellulose (ChiCMC) coating on controlling postharvest fungal decay in papaya fruits during storageãt 30°C for 8 days was studied. Synergistic combinations of 0.0397% clove oil combined with 0.25% potassium sorbate, or 0.25% cinnamon oil combined with 1% potassium sorbate in the ChiCMC coating were effective to delay fungal decay in papaya fruits. At the end of storage, these coatings significantly showed less decay incidence (53.3-56.7%) compared toã control treatment (100% decay incidence). Thus, use of cinnamon or clove oil combined with potassium sorbate in the ChiCMC coating could potentially be used in the postharvest management for decay control in papaya fruits.
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    New Pyrrolobenzoxazine Sesquiterpenoid Derivatives from the Fungus Talaromyces trachyspermus
    (2021-07-13)
    Chaiyosang, Boonyanoot
    ;
    Kanokmedhakul, Kwanjai
    ;
    Soytong, Kasem
    ;
    Poeaim, Supattra
    ;
    Soytong, Mayamor
    Three new pyrrolobenzoxazine sesquiterpenoids, talatrachyoxazines A-C (1-3), together with fourteen known compounds (4-17), were isolated from the fungus Talaromyces trachyspermus EU23. Their structures were identified by spectroscopic evidence and mass spectrometry. The absolute configurations of 1-3 were determined by NOESY data and comparison of their calculated and experimental electronic circular dichroism (ECD) spectra. Compound 1 showed cytotoxic activity against HelaS3, KB, HT-29, MCF-7, and HepG2 cell lines with IC50 values of 7, 11, 10, 12, and 10 μM, respectively. Compounds 1 and 14 showed weak antibacterial activity against the gram-positive bacteria Bacillus cereus and Bacillus subtilis, while 1-3 and 14 showed weak antibacterial activity against the gram-negative bacterium Pseudomonas aeruginosa. In addition, compound 1 showed weak antibacterial activity against Escherichia coli.
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    Effective of Neosartorya and Talaromyces to control Alternaria brassicicola causing leaf spot of kale
    (2018-12-01)
    Punyanobpharat, A.
    ;
    Soytong, K.
    ;
    Poeaim, S.
    The antagonistic potential of Neosartorya and Talaromyces proved to control leaf spot of kale caused by Alternaria brassicicola. Leaf spot symptoms were collected from Nakornpathom, Suphanburi, Ratchaburi and Nonthaburi provinces, isolated and identified the pthogen by morphological and molecular characterization. Four isolates were confirmed as A. brassicicola. The pathogenicity test was done by detached leaf bioassay and found that AbK-NP01 was the highest virulence pathogenic isolate. Dual culture technique was used to assay with eight species of antagonistic fungi (N. hiratsukae, N. pseudofischeri, N. aureola, N. spinosa, N. fennelliae, Neosartorya sp., T. trachyspermus and T. muroii) against A. brassicicola. The best effective of antagonist to control the tested pathogen was N. spinosa CHA09-A01.
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    Biological control of anthracnose disease on banana var 'Namwa Mali-Ong' by Neosartorya species
    (2018-12-01)
    Pattarasaikul, W.
    ;
    Soytong, K.
    ;
    Poeaim, S.
    The anthracnose disease caused by Colletotrichum musae on banana was controlled by biological control agents. Seven isolates of C. musae were collected from banana growing area in Suphanburi, Nakhonpathom, Ratchaburi and Nonthaburi province, Thailand. Pathogenicity was tested on fresh banana, and proved that isolates CMDC-01 and CMNM-01 were most aggressive isolates. These isolates were molecular phylogeny confirmed species. In vitro test was done by dual culture tecnique, two isolates of pathogen were tested against ten isolates of antagonistic fungi (Neosartorya hiratsukae, N. pseudofischeri, N, aureola, N. spinosa, N. fenneliae, Talaromyces muroii and T. trachyspermus). The result showed the best antagonistic isolate was N. pseudofischeri EU13 which inhibited C. musae CMDC-01 of 51.23% and N. fenneliae CHA03-A11 inhibited C. musae CMNM-01 of 59.85%.
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    Effective of Neosatorya to control Phomopsis asparagi causing stem blight of asparagus
    (2018-12-01)
    Mangkalad, T.
    ;
    Soytong, K.
    ;
    Tangthirasunun, N.
    ;
    Poeaim, S.
    The biocontrol of stem blight of asparagus Phomosis asparagi was proved by Neosartorya and Talaromyces. The symptoms are appearance as oval-shaped lesions with light brown centres and slightly darker margins. Ten isolates of pathogen were isolated by tissue transplanting technique and confirmed by morphology and molecular identification based on internal transcribed spacer (ITS)-nrDNA sequence as P. asparagi. Fungal mycelia showed undulate margins and colonies white to gray and reached a diameter of 9 cm petri dish after 10 days. Alpha conidia were oblong or spindle-shaped, with a size of 2‒3.5 × 6.5‒8.8 µm. The fungal pathogenicity test showed the asparagus was infected by P. asparagi within 2 days on moisture chamber at room temperature. Neosartorya and Talaromyces were proved antifungal acrtivety against P. asparagi causing of stem blight of asparagus in dual culture. It revealed that N. hiratsuka EU06 was the highest inhibition P. asparagi causing the stem blight of asparagus at 59.50%.