Accumulation of Phytoalexins Scoparone and Scopoletin in Citrus Fruits Subjected to Various Postharvest Treatments

Rodov, Victor; Ben-Yehoshua, S.; Fang, Dan; Droogmans, Guy; Castia, T.

doi:10.17660/actahortic.1994.381.69

Cited by 55 publications

(37 citation statements)

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“…This induced resistance has been related to the production of phenylalanine ammonia lyase , phytoalexins (Rodov et al 1994;Arras 1996;Droby et al 2002), peroxidases (Fajardo et al 1998), and ethylene Droby et al 2002) in plant tissues. C. saitoana induced chitinase activity and caused deposition of papillae on host cells in apple surface wounds (El Ghaouth et al 1998).…”

Section: Induction Of Host Resistancementioning

confidence: 99%

Potential of yeasts as biocontrol agents of soil-borne fungal plant pathogens and as plant growth promoters

2006

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Among soil microorganisms, yeasts have received little attention as biocontrol agents of soil-borne fungal plant pathogens in comparison to bacterial, actinomycetes, and filamentous fungal antagonists. The mechanisms of action of potential antagonism by yeasts in relation to soilborne fungal plant pathogens are expected to be similar to those involved with pathogens of aerial parts of the plant, including leaves and fruits. Several taxa of yeasts have been recorded as endophytes in plants, with a small proportion recorded to promote plant growth. The ability of certain taxa of yeasts to multiply rapidly, to produce antibiotics and cell wall-degrading enzymes, to induce resistance of host tissues, and to produce plant growth regulators indicates the potential to exploit them as biocontrol agents and plant growth promoters. More than ten genera of yeasts have been used to control postharvest diseases, especially of fruits. Suppression of classes of fungal pathogens of fruits and foliage that are similar to those associated with soilborne fungal root pathogens, strongly suggests that yeasts also have potential for the biological control of diseases caused by soil-borne fungal plant pathogens, as is evident in reports of certain yeasts in suppressing some soil-borne fungal plant pathogens. This review explores the potential of soil yeasts to suppress a wider range of soil-borne fungal plant pathogens and to promote plant growth.

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Section: Induction Of Host Resistancementioning

confidence: 99%

Potential of yeasts as biocontrol agents of soil-borne fungal plant pathogens and as plant growth promoters

2006

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“…Heat treatment by itself did not induce the production of the phytoalexin scoparone in lemon fruit, but markedly enhanced its elicitation by P. digitatum (10). Scopoletin is another phytoalexin that has been found in citrus fruit (16).…”

Section: Introductionmentioning

confidence: 99%

“…Other postharvest treatments, such as UV radiation (11,14,15) and yeast biocontrol agents (16,17), have been shown to elicit scoparone production in various citrus cultivars, in parallel with decay control. Heat treatment by itself did not induce the production of the phytoalexin scoparone in lemon fruit, but markedly enhanced its elicitation by P. digitatum (10).…”

Section: Introductionmentioning

confidence: 99%

Mode of Action of Hot-Water Dip in Reducing Decay of Lemon Fruit

Nafussi

Ben-Yehoshua

Rodov

et al. 2000

J. Agric. Food Chem.

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A hot-water dip for 2 min at 52-53 degrees C prevented decay for at least one week in lemon fruit inoculated with Penicillium digitatum. The mode of action of hot water in reducing decay was investigated by studying the effects of this treatment on the pathogen and on the resistance mechanisms of the fruit. The hot-water dip had a transient inhibitory effect on the pathogen, arresting its growth for 24-48 h. During this lag period, the combined effects of the pathogen and the hot-water dip induced the build up of resistance in the peel. Lignin production in the inoculated sites began within 24 h after inoculation or wounding. When inoculation was followed by the hot-water dip, lignin accumulation continued for a week. Inoculated lemons that were not dipped in hot water rotted completely within 3 days after inoculation and their lignin content did not rise or even decreased. The scoparone concentration in the inoculated sites of hot dipped fruit started to rise 24 h after treatment and reached a level sufficient to inhibit the pathogen within 2 days after treatment. Parallel to scoparone accumulation, scopoletin was detected in inoculated and heat-treated lemons. Without the pathogen challenge or wounding, heat treatment by itself was not able to induce any of the above-mentioned defensive effects. Our data do not support the involvement of ethanol-extractable aldehydes, associated in the literature with wound gum, or of citral in decay inhibition in hot-water dipped lemons.

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“…This concentration was determined to cause decay. Inoculation was performed according to the methods of Rodov et al (1994) and Afek et al (1999), with some modifications.…”

Section: Changes In the Concentration Of Scoparone Inmentioning

confidence: 99%

Comparative Study of Scoparone Accumulation in Various Citrus Species after Inoculation with Gray Mold

Kuniga¹,

Matsumoto²

2006

J. Japan. Soc. Hort. Sci.

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Gray mold (Botrytis cinerea Persoon) induced the accumulation of scoparone (6,7-dimethoxycoumarin) in the flavedo of fruit in all citrus species used in this study. The time-course of the accumulation of this compound was species dependent. In the fruit of 'Kiyomi' and Meiwa kumquat, scoparone accumulated gradually over several days after inoculation. No accumulation occurred in the non-inoculated citrus fruit. In several citrus species, including Tankan, 'Seminole', and 'Ellendale', Scoparone concentration increased up to 4 days after treatment. In 'Murcott', 'Triumph', and Yuzu, the maximum concentration was observed within 7 days of treatment. On the other hand, in 'Imamura-unshu', 'Kawano Natsudaidai', Ponkan, 'Morita Navel', Kinukawa, 'Eureka' lemon, kumquats, calamondin, and citrangequat, the increase in scoparone was much lower. These results suggest that scoparone is a phytoalexin induced by gray mold, accumulating in a broad range of citrus species.

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Accumulation of Phytoalexins Scoparone and Scopoletin in Citrus Fruits Subjected to Various Postharvest Treatments

Cited by 55 publications

References 0 publications

Potential of yeasts as biocontrol agents of soil-borne fungal plant pathogens and as plant growth promoters

Potential of yeasts as biocontrol agents of soil-borne fungal plant pathogens and as plant growth promoters

Mode of Action of Hot-Water Dip in Reducing Decay of Lemon Fruit

Comparative Study of Scoparone Accumulation in Various Citrus Species after Inoculation with Gray Mold

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