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Application of Volatile Antifungal Plant Essential Oils for Controlling Pepper Fruit Anthracnose by Colletotrichum gloeosporioides.

Hong JK, Yang HJ, Jung H, Yoon DJ, Sang MK, Jeun YC - Plant Pathol. J. (2015)

Bottom Line: Inhibition of the mycelial growth by indirect vapour treatment with essential oils was also demonstrated compared with untreated control.Plant protection efficacies of the plant essential oils were demonstrated by reduced lesion diameter on the C. gloeosporioides-inoculated immature green pepper fruits compared to the inoculated control fruits without any plant essential oil treatment.Thus, application of different plant essential oils can be used for eco-friendly disease management of anthracnose during pepper fruit production.

View Article: PubMed Central - PubMed

Affiliation: Department of Horticultural Science, Gyeongnam National University of Science and Technology (GNTech), 33 Dongin-ro, Jinju 660-758, Korea.

ABSTRACT
Anthracnose caused by Colletotrichum gloeosporioides has been destructive during pepper fruit production in outdoor fields in Korea. In vitro antifungal activities of 15 different plant essential oils or its components were evaluated during conidial germination and mycelial growth of C. gloeosporioides. In vitro conidial germination was most drastically inhibited by vapour treatments with carvacrol, cinnamon oil, trans-cinnamaldehyde, citral, p-cymene and linalool. Inhibition of the mycelial growth by indirect vapour treatment with essential oils was also demonstrated compared with untreated control. Carvacrol, cinnamon oil, trans-cinnamaldehyde, citral and eugenol were among the most inhibitory plant essential oils by the indirect antifungal efficacies. Plant protection efficacies of the plant essential oils were demonstrated by reduced lesion diameter on the C. gloeosporioides-inoculated immature green pepper fruits compared to the inoculated control fruits without any plant essential oil treatment. In planta test showed that all plant essential oils tested in this study demonstrated plant protection efficacies against pepper fruit anthracnose with similar levels. Thus, application of different plant essential oils can be used for eco-friendly disease management of anthracnose during pepper fruit production.

No MeSH data available.


Effect of different plant essential oils on in vitro mycelial growth of Collectotrichum gloeosporioides by an indirect volatile activity. In vitro inhibitory activities of various plant essential oils against C. gloeosporioides mycelia were shown by colony diameter (mm). Values presented are means and error bars represent the standard deviation of the means of four independent experimental replications. Means followed by the same letter are not significantly different at 5% level by least significant difference test. nd, not determined. Different essential oil doses were applied 8 μl/disc demonstrated in upper (2 μl/disc), middle (5 μl/disc) and bottom (8 μl/disc) graphs.
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f2-ppj-31-269: Effect of different plant essential oils on in vitro mycelial growth of Collectotrichum gloeosporioides by an indirect volatile activity. In vitro inhibitory activities of various plant essential oils against C. gloeosporioides mycelia were shown by colony diameter (mm). Values presented are means and error bars represent the standard deviation of the means of four independent experimental replications. Means followed by the same letter are not significantly different at 5% level by least significant difference test. nd, not determined. Different essential oil doses were applied 8 μl/disc demonstrated in upper (2 μl/disc), middle (5 μl/disc) and bottom (8 μl/disc) graphs.

Mentions: Various plant essential oils reduced colony diameter of the fungus by different volatile antifungal activities (Fig. 2). Without plant essential oil treatment, the fungal colony was grown to ca. 51.8 mm in diameter 10 days after inoculation except for diameter of fungal mycelial plugs. Three doses (2, 5 and 8 μl/disc) of carvacrol completely inhibited the fungal mycelial growth. Antifungal activities of cinnamon oil, trans-cinnamaldehyde, citral, clove oil, eugenol and geraniol appeared in dose-dependent manners, and relatively higher doses manifested stronger antifungal activities (Table 1). Suppressive efficacies of other essential oils such as 1,8-cineole, p-cymene, (±)-limonene, linalool, menthone, (1R)-(+)-α-pinene, (1S)-(−)-α-pinene and β-pinene demonstrated as colony size were marginal.


Application of Volatile Antifungal Plant Essential Oils for Controlling Pepper Fruit Anthracnose by Colletotrichum gloeosporioides.

Hong JK, Yang HJ, Jung H, Yoon DJ, Sang MK, Jeun YC - Plant Pathol. J. (2015)

Effect of different plant essential oils on in vitro mycelial growth of Collectotrichum gloeosporioides by an indirect volatile activity. In vitro inhibitory activities of various plant essential oils against C. gloeosporioides mycelia were shown by colony diameter (mm). Values presented are means and error bars represent the standard deviation of the means of four independent experimental replications. Means followed by the same letter are not significantly different at 5% level by least significant difference test. nd, not determined. Different essential oil doses were applied 8 μl/disc demonstrated in upper (2 μl/disc), middle (5 μl/disc) and bottom (8 μl/disc) graphs.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4564152&req=5

f2-ppj-31-269: Effect of different plant essential oils on in vitro mycelial growth of Collectotrichum gloeosporioides by an indirect volatile activity. In vitro inhibitory activities of various plant essential oils against C. gloeosporioides mycelia were shown by colony diameter (mm). Values presented are means and error bars represent the standard deviation of the means of four independent experimental replications. Means followed by the same letter are not significantly different at 5% level by least significant difference test. nd, not determined. Different essential oil doses were applied 8 μl/disc demonstrated in upper (2 μl/disc), middle (5 μl/disc) and bottom (8 μl/disc) graphs.
Mentions: Various plant essential oils reduced colony diameter of the fungus by different volatile antifungal activities (Fig. 2). Without plant essential oil treatment, the fungal colony was grown to ca. 51.8 mm in diameter 10 days after inoculation except for diameter of fungal mycelial plugs. Three doses (2, 5 and 8 μl/disc) of carvacrol completely inhibited the fungal mycelial growth. Antifungal activities of cinnamon oil, trans-cinnamaldehyde, citral, clove oil, eugenol and geraniol appeared in dose-dependent manners, and relatively higher doses manifested stronger antifungal activities (Table 1). Suppressive efficacies of other essential oils such as 1,8-cineole, p-cymene, (±)-limonene, linalool, menthone, (1R)-(+)-α-pinene, (1S)-(−)-α-pinene and β-pinene demonstrated as colony size were marginal.

Bottom Line: Inhibition of the mycelial growth by indirect vapour treatment with essential oils was also demonstrated compared with untreated control.Plant protection efficacies of the plant essential oils were demonstrated by reduced lesion diameter on the C. gloeosporioides-inoculated immature green pepper fruits compared to the inoculated control fruits without any plant essential oil treatment.Thus, application of different plant essential oils can be used for eco-friendly disease management of anthracnose during pepper fruit production.

View Article: PubMed Central - PubMed

Affiliation: Department of Horticultural Science, Gyeongnam National University of Science and Technology (GNTech), 33 Dongin-ro, Jinju 660-758, Korea.

ABSTRACT
Anthracnose caused by Colletotrichum gloeosporioides has been destructive during pepper fruit production in outdoor fields in Korea. In vitro antifungal activities of 15 different plant essential oils or its components were evaluated during conidial germination and mycelial growth of C. gloeosporioides. In vitro conidial germination was most drastically inhibited by vapour treatments with carvacrol, cinnamon oil, trans-cinnamaldehyde, citral, p-cymene and linalool. Inhibition of the mycelial growth by indirect vapour treatment with essential oils was also demonstrated compared with untreated control. Carvacrol, cinnamon oil, trans-cinnamaldehyde, citral and eugenol were among the most inhibitory plant essential oils by the indirect antifungal efficacies. Plant protection efficacies of the plant essential oils were demonstrated by reduced lesion diameter on the C. gloeosporioides-inoculated immature green pepper fruits compared to the inoculated control fruits without any plant essential oil treatment. In planta test showed that all plant essential oils tested in this study demonstrated plant protection efficacies against pepper fruit anthracnose with similar levels. Thus, application of different plant essential oils can be used for eco-friendly disease management of anthracnose during pepper fruit production.

No MeSH data available.