Suppression of Blue Mold Symptom Development in Satsuma Mandarin Fruits Treated by Low-Intensity Blue LED Irradiation

Yamaga, Ittetsu; Takahashi, Testuya; Ishii, Kanako; Kato, Mitsuhiro; Kobayashi, Yasushi

doi:10.3136/fstr.21.347

Cited by 19 publications

(13 citation statements)

References 15 publications

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“…Previous work has shown the efficacy of LBL in inducing resistance in citrus fruits against P. digitatum and P. italicum infection (20,(22)(23)(24)(25), and in controlling the growth of strains from both pathogens that are resistant and tolerant to commercial fungicides (21). The results presented herein further show the potential of this emerging technology to decrease fungal viability and the capability to infect citrus fruits.…”

Section: Discussionsupporting

confidence: 63%

“…Our previous work showed the potential of LBL in controlling the growth of P. digitatum strains resistant or tolerant to the main fungicides (imazalil and TBZ) used by the industry for decay control in citrus fruits and, hence, for reducing infection caused by latent contaminations during postharvest handling and storage of citrus fruits (20,21). Moreover, LBL elicits resistance in citrus fruits against this pathogen, which may help to reduce losses caused by green mold rot during postharvest storage of citrus fruits (20,(22)(23)(24)(25). These results envisage that BL could be used as a mean to minimize P. digitatum contaminations in cold storage rooms and other strategic points in the packinghouses, and to reduce postharvest disease in citrus fruits.…”

Section: Introductionmentioning

confidence: 99%

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Light‐emitting Diode Blue Light Alters the Ability of Penicillium digitatum to Infect Citrus Fruits

Lafuente

Alférez

González-Candelas

2018

Photochem & Photobiology

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Penicillium digitatum (Pers.:Fr.) Sacc. is the main fungus causing postharvest losses in citrus fruits. Previous work showed the potential of LED blue light (LBL) in controlling P. digitatum growth. Here, we have investigated whether LBL alters the ability of this fungus to infect citrus fruits. Before fruit infection, Petri plates inoculated with the same conidia concentration were held under darkness (control) or LBL (100 μmol m s ) for 8 d (continuous light), or were treated with the same LBL for 3 d and then shifted to darkness for 5 d (non-continuous light). Spores from cultures exposed to continuous light showed very low capacity to germinate (1.8% respect to control) but a high viability and a similar morphology and ability to infect the fruits than spores from control cultures. The number of spores produced in plates exposed to non-continuous light was slightly lower than in control plates, but they showed much lower viability and lower capacity to infect the fruits. This effect was more likely related to aberrant morphology of spores, which formed aggregates, than to its metabolic activity or its ability to produce ethylene that might contribute to destroy natural defense barriers from the fruit.

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Section: Discussionsupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Light‐emitting Diode Blue Light Alters the Ability of Penicillium digitatum to Infect Citrus Fruits

Lafuente

Alférez

González-Candelas

2018

Photochem & Photobiology

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“…The relation between PAL activity and blue LED irradiation to postharvest mandarin fruit resistance to decay caused by fungal infection also needs to be further characterized. Blue LED irradiation could directly inhibit fungal growth in satsuma mandarin fruits (Yamaga et al, 2015b). Blue light exposure was also able to stop colony growth of P. digitatum, which had already grown a mycelium, and no further growth occurred if three-day LED treated colonies were transferred to darkness (Lafuente and Alférez, 2015).…”

Section: Discussionmentioning

confidence: 99%

“…2), and the fruits were irradiated for 90 days (from January 22 to April 19; the fruits were in storage from December 22 to April 19). The photon flux of this tape-type LED is 10 μmol·m −2 ·s −1 , and they were used for 12 h each day, a duration chosen considering the fact that blue LED with an emission peak of 465 nm and photon flux of 8 μmol·m −2 ·s −1 significantly reduces the growth of blue mold (P. italicum) (Yamaga et al, 2015b), while the phospholipase A 2 gene expression in Citrus sinensis exposed to a 12/12 h light/dark cycle of blue light (photon flux 3 μmol·m −2 ·s −1 ) was higher than that in plants under dark treatment (Liao and Burns, 2010).…”

Section: Long-term Storage Methodsmentioning

confidence: 99%

“…Moreover, since LEDs are costly, we must try to use the least possible number of light sources for irradiation. Previously, we reported that irradiation with blue LED light at of 8 μmol·m −2 ·s −1 photon flux reduced blue mold sporulation in the satsuma mandarin 'Aoshima unshu' (Yamaga et al, 2015b). Therefore, it should be possible to reduce citrus fruit decay caused by postharvest fungal diseases in storage rooms by irradiation with relatively low intensities of blue LED light.…”

Section: Introductionmentioning

confidence: 99%

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Blue LED Irradiation Induces Scoparone Production in Wounded Satsuma Mandarin ‘Aoshima Unshu’ and Reduces Fruit Decay during Long-term Storage

Yamaga

Nakamura

2018

The Hortic J

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In the present study, we examined the effect of blue LED irradiation on production of phytoalexin scoparone in wounded satsuma mandarin fruit as a result of fungal infections, as well as the effect of tape-type blue LED on fruit decay during long-term storage (from December to April) in an actual storage room. The blue LED treatment reduced the rate of fruit decay compared to that of dark treatment in wounded fruits. The decay rate of LED irradiated fruit was 13.3%, while that of non-irradiated fruit was 51.1%. In wounded fruits, blue LED treatment resulted in significantly higher scoparone contents than dark treatment. Intact (non-wounded) fruits had low scoparone contents, irrespective of blue LED irradiation. In an examination of changes in total fruit decay rate during storage using tape type-blue LED, the total decay rate was not significantly different between the LED-treated and untreated fruits until 64 days after storage (36 days after starting LED irradiation). On the other hand, at 92 and 120 days after the start of storage, total fruit decay under blue LED treatment was significantly lower compared to the untreated control. The tape-type blue LED (10 μmol·m −2 ·s −1 ) did not affect either the fruit quality analyzed (soluble solid content, titratable acidity, specific gravity, percentage of flesh) or the rind color. These results indicate that blue light induces scoparone production in wounded satsuma mandarin, and because of this, along with other putative factors, tape-type blue LED irradiation reduces mandarin fruit decay during long-term storage.

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Pasteurization of mixed mandarin and Hallabong tangor juice using pulsed electric field processing combined with heat

Lee

Bang

Choi

et al. 2018

Food Sci Biotechnol

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Effects of pulsed electric filed (PEF) processing combined with heating (H-PEF processing) on the inactivation of microorganisms and the physicochemical properties of mixed mandarin and Hallabong tangor (MH) juice were studied. Using a pilot-scale PEF system, MH juice, pre-heated at 55 °C, was PEF-treated at 19 kV/cm of electric field and 170 kJ/L of specific energy and the juice, pre-heated at 70 °C, was PEF-treated at 16 kV/cm and 100 kJ/L or 12 kV/cm and 150 kJ/L. H-PEF processing at 70 °C-16 kV/cm-100 kJ/L reduced the aerobe, yeast/mold, and coliform counts of MH juice by 3.9, 4.3, and 0.8 log CFU/mL, respectively, without affecting the ascorbic acid concentration and antioxidant capacity of juice. H-PEF processing changed juice color and browning degree ( < 0.05), but not total soluble solid content or pH. By controlling initial juice temperature and electric field strength, H-PEF processing can be an effective pasteurization method for mixed juice with minimal changes in quality.

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Suppression of Blue Mold Symptom Development in Satsuma Mandarin Fruits Treated by Low-Intensity Blue LED Irradiation

Abstract: the most pronounced inhibitory effect was exerted on P. italicum sporulation. These results show that treatment with low-intensity blue LED irradiation is sufficient to reduce blue mold symptom development and is a promising safe approach to control postharvest spoilage in mandarin fruit.

Cited by 19 publications

References 15 publications

Light‐emitting Diode Blue Light Alters the Ability of Penicillium digitatum to Infect Citrus Fruits

Light‐emitting Diode Blue Light Alters the Ability of Penicillium digitatum to Infect Citrus Fruits

Blue LED Irradiation Induces Scoparone Production in Wounded Satsuma Mandarin ‘Aoshima Unshu’ and Reduces Fruit Decay during Long-term Storage

Pasteurization of mixed mandarin and Hallabong tangor juice using pulsed electric field processing combined with heat

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