Postharvest treatment effects on 'B74' mango fruit lenticel discolouration after irradiation

Li, G. Q., Gupta, M., San, A. T., Joyce, D. C., Hofman, P. J., Macnish, A. J. and Marques, J. (2016). Postharvest treatment effects on 'B74' mango fruit lenticel discolouration after irradiation. In: R. Drew, M. Fitch and J. Zhu, XXIX International Horticultural Congress on Horticulture: Sustaining Lives, Livelihoods and Landscapes. Proceedings of the IV International Symposium on Papaya, VIII International Pineapple Symposium, and International Symposium on Mango. XXIX International Horticultural Congress on Horticulture: Sustaining Lives, Livelihoods and Landscapes (IHC2014), Brisbane, QLD, Australia, (385-392). 17-22 August 2014. doi:10.17660/ActaHortic.2016.1111.55


Author Li, G. Q.
Gupta, M.
San, A. T.
Joyce, D. C.
Hofman, P. J.
Macnish, A. J.
Marques, J.
Title of paper Postharvest treatment effects on 'B74' mango fruit lenticel discolouration after irradiation
Conference name XXIX International Horticultural Congress on Horticulture: Sustaining Lives, Livelihoods and Landscapes (IHC2014)
Conference location Brisbane, QLD, Australia
Conference dates 17-22 August 2014
Proceedings title XXIX International Horticultural Congress on Horticulture: Sustaining Lives, Livelihoods and Landscapes. Proceedings of the IV International Symposium on Papaya, VIII International Pineapple Symposium, and International Symposium on Mango   Check publisher's open access policy
Journal name Acta Horticulturae   Check publisher's open access policy
Place of Publication Leuven, Belgium
Publisher International Society for Horticultural Science
Publication Year 2016
Sub-type Fully published paper
DOI 10.17660/ActaHortic.2016.1111.55
Open Access Status Not yet assessed
ISBN 9789462611054
ISSN 0567-7572
Editor R. Drew
M. Fitch
J. Zhu
Volume 1111
Start page 385
End page 392
Total pages 8
Collection year 2017
Language eng
Abstract/Summary Lenticel discolouration (LD) is a common disorder of mango fruit around the world. It results in poor appearance and disappointment of consumers. LD is exacerbated by treatment of mango fruit with gamma irradiation for insect disinfestation. The issue is problematic on the relatively new mango cultivar 'B74' and may represent an oxidative browning process. With a view to reducing irradiationinduced LD on 'B74', postharvest wax (one and three layers; 75% carnauba wax) and antioxidant (100 mM ascorbic acid, 100 mM calcium chloride, 10, 50 and 100 mM calcium ascorbate) dip treatments were investigated. Treatment of green mature fruit with three layers of wax prior to exposure to 557 Gy gamma irradiation reduced LD by 40% relative to the non-waxed control. However, the fruit failed to ripen properly as evidenced by delayed skin colour change, retarded softening and increased skin browning as compared to the controls and fruit coated with one layer of wax. Treatment with one layer of wax did not reduce LD. Mechanistically, the responses suggest that air exchange plays a pivotal role in LD. A lowered oxygen concentration in the lenticels may reduce the disorder after irradiation treatment. Postharvest treatments with the various antioxidants failed to reduce LD. Rather, all antioxidant treatments at the test concentrations, except calcium chloride, significantly increased skin browning.
Keyword 75% carnauba wax
Antioxidants
Firmness
Lenticel discolouration
Skin browning
Skin colour
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

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