Effect of UV-B irradiation on chlorophyll-degrading enzyme activities and postharvest quality in stored lime (Citrus latifolia Tan.) fruit

Kaewsuksaeng, Samak; Urano, Yoshiyuki; Aiamla-or, Sukanya; Shigyo, Masayoshi; Yamauchi, Naoki

doi:10.1016/j.postharvbio.2011.02.014

Cited by 79 publications

(46 citation statements)

References 29 publications

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“…The unit of Mg-dechelating substance activity was defined as the formation of 1 mmol pheophorbide a per minute. Chlide a was prepared according to Kaewsuksaeng et al (2011).…”

Section: Measurement Of Chlorophyll Content and Chlorophyllase Activitymentioning

confidence: 99%

Hydrogen sulfide delays leaf yellowing of stored water spinach (Ipomoea aquatica) during dark-induced senescence by delaying chlorophyll breakdown, maintaining energy status and increasing antioxidative capacity

Liú

et al. 2015

Postharvest Biology and Technology

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“…The unit of Mg-dechelating substance activity was defined as the formation of 1 mmol pheophorbide a per minute. Chlide a was prepared according to Kaewsuksaeng et al (2011).…”

Section: Measurement Of Chlorophyll Content and Chlorophyllase Activitymentioning

confidence: 99%

Hydrogen sulfide delays leaf yellowing of stored water spinach (Ipomoea aquatica) during dark-induced senescence by delaying chlorophyll breakdown, maintaining energy status and increasing antioxidative capacity

Liú

et al. 2015

Postharvest Biology and Technology

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“…This response variation was likely due to the nature of genotypic differences (Bally et al, 1996;. This result accords with Hofman et al (Kaewsuksaeng et al, 2011). The development of yellow-orange skin colouration during mango ripening is due to carotenoids accumulation in the mesocarp (Vásquez-Caicedo et al, 2005).…”

Section: Discussionsupporting

confidence: 82%

Lenticel discolouration, under-skin browning and resin canal disorder in Australian mango fruit cultivars

San¹

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Lenticel discolouration (LD), under-skin browning (USB), and resin canal disorder (RCD) are three fruit skin disorders of concern to the Australian mango industry. LD is confined to lenticels on the fruit skin. It was suspected that irradiation may differentially induce LD on cvs. 'B74', 'Honey Gold', 'Kensington Pride', and 'R2E2' fruit. Irradiation at 0.5 kGy significantly (P≤0.05) increased LD and delayed the loss of green skin colour of all four cultivars. There was generally no significant differences (P>0.05) between 0.5 ('commercial' dose) and 1.0 kGy ('upper limit' dose).The least pronounced effect was on cv. 'Honey Gold'. Irradiation also diminished aroma volatiles production by cvs. 'Kensington Pride' and 'R2E2'. Examination of the morphology of LD showed it in tissue sections as browning of sub-lenticellular cells around lenticel cavities. No such browning was evident in sub-lenticellular cells around non-coloured lenticel cavities. Coloured polymerised phenolic compounds appeared accumulate in the cell wall and in the cytoplasm of sub-lenticellular cells around the cavities of discoloured lenticels.USB is a physiological disorder evident as spreading grey -brown sub-surface lesions in cv. 'Honey Gold' mango fruit. In contrast, RCD in cv. 'Kensington Pride' mango fruit is evident as ramifying dark brown sub-surface resin canals. These two largely cv. specific browning disorders were compared and contrasted at the cellular level. USB was characterised by dark brown surrounding parenchyma cells around the epithelial cells that line resin ducts. This disorder involves starch retention as well as deposition of phenolic compounds in parenchyma cells surrounding the epithelial cells of resin ducts. In contrast, RCD was distinguished by localised browning inside resin duct lumens. The browning process evidently involved accumulation of polymerised phenolics.Polyphenol oxidase and peroxidase enzymes were determined by tissue printing to be associated with both USB and RCD browning.The effect of harvest time over the diurnal cycle was investigated with regard to the propensity of cv. 'Honey Gold' fruit to develop USB. USB expressed in postharvest is related to the cumulative interaction of physical (viz., vibration) and physiological (viz., chilling) stresses. Fruit harvested during the day were relatively more susceptible to developing USB than were those picked at night.The higher USB incidence in the afternoon harvest was related to temporally variable sap phytoxicity. An important contributory factor to greater afternoon sap phytoxicity was concomit ant increases in the concentrations of volatiles in the sap and, especially, in the non-aqueous sap phase.Changing from day to night and early morning harvesting afforded reduced incidence and severity of USB on cv. 'Honey Gold' fruit. v Li, G.Q., Gupta, M ., San, A.T., Joyce, D.C., Hofman, P.J., M acnish, A.J., M arques, J., 2016.Postharvest treatment effects on 'B74' mango fruit lenticel discolouration after irradiation. Acta Horticulturae (ISHS) 1111...

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“…values in broccoli florets irradiated with a 19 kJ·m −2 dose was more suppressed than it was in the control during storage at 4, 15, and 25°C, especially at 4 and 15°C (Aiamla-or, 2011).…”

Section: Inhibitory Effect Of Yellowing By Stress Treatmentsmentioning

confidence: 72%

“…Kuroda et al (1990) also found that cationic isoperoxidase was localized in the barley leaf chloroplast and the enhancement of activity was suppressed with kinetin treatment, which might suggest that it is involved in Chl degradation. Moreover, stress treatments suppressed the enhancement of cationic isoperoxidase with floret yellowing (Aiamla-or, 2011;Aiamla-or et al, 2010;Funamoto et al, 2002Funamoto et al, , 2006. Pheophytinase (PPH) was recently demonstrated in Arabidopsis thaliana to be a Phein a-specific dephytylation enzyme by Schelbert et al (2009), who proposed that, in the pathway of Chl degradation, the removal of Mg 2+ preceded dephytylation, resulting in the following order without Chlide a formation: Chl a → Phein a → Pheide a.…”

Section: ) Involvement Of the Phenoxy Radical In Peroxidasemediated mentioning

confidence: 99%

Quality Maintenance of Postharvest Horticultural Crops by Stress Treatments and Approach for the Elucidation of Its Mechanism

Yamauchi

2013

J. Japan. Soc. Hort. Sci.

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This review deals with the effectiveness and mechanism of stress treatments, such as heat and UV treatments (hot air, hot water, and UV-B), on the quality maintenance of postharvest green horticultural crops such as broccoli florets and green sour citrus fruits (lime, Nagato-yuzukichi, and yuzu), in which chlorophyll (Chl) degradation is a main factor in quality deterioration. Postharvest stress treatments effectively suppressed Chl degradation with senescence during storage. In broccoli florets and lime fruit, hydrogen peroxide, which is produced by postharvest stress treatments, could induce the activation of the ascorbate-glutathione (AsA-GSH) cycle, and enhancement of the AsA-GSH cycle might be involved in the suppression of senescence in such produce. The mechanism of peroxidase-mediated Chl degradation and the control of Chl-degrading enzymes by stress treatments were determined using broccoli florets and Nagato-yuzukichi fruit. Peroxidase oxidized phenolic compounds such as apigenin, naringin and p-coumaric acid, which have a hydroxyl group at the p-position, to form phenoxy radicals, and Chl a could be degraded by the formed phenoxy radicals to colorless low-molecularweight compounds. It was found that the cationic isoperoxidase related to Chl degradation, which is localized in the chloroplast, increased with senescence during storage and enhancement of the activity was effectually inhibited by stress treatments. In addition to peroxidase, the activities and gene expression of other Chl-degrading enzymes were controlled by stress treatments. Thus, stress treatments seem to be a useful method for controlling Chl degradation in stored green fruits and vegetables.

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Effect of UV-B irradiation on chlorophyll-degrading enzyme activities and postharvest quality in stored lime (Citrus latifolia Tan.) fruit

Cited by 79 publications

References 29 publications

Hydrogen sulfide delays leaf yellowing of stored water spinach (Ipomoea aquatica) during dark-induced senescence by delaying chlorophyll breakdown, maintaining energy status and increasing antioxidative capacity

Hydrogen sulfide delays leaf yellowing of stored water spinach (Ipomoea aquatica) during dark-induced senescence by delaying chlorophyll breakdown, maintaining energy status and increasing antioxidative capacity

Lenticel discolouration, under-skin browning and resin canal disorder in Australian mango fruit cultivars

Quality Maintenance of Postharvest Horticultural Crops by Stress Treatments and Approach for the Elucidation of Its Mechanism

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