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Physiochemistry of blackberries (Rubus L. subgenus Rubus Watson) affected by red drupelet reversion

Citation

Edgley, M and Close, DC and Measham, PF and Nichols, DS, Physiochemistry of blackberries (Rubus L. subgenus Rubus Watson) affected by red drupelet reversion, Postharvest Biology and Technology, 153 pp. 183-190. ISSN 0925-5214 (2019) [Refereed Article]

Copyright Statement

Crown Copyright © 2019 Published by Elsevier B.V. All rights reserved.

DOI: doi:10.1016/j.postharvbio.2019.04.012

Abstract

Red drupelet reversion (RDR) is a physiological disorder causing individual or groups of drupelets on blackberries that are black at harvest to turn red during postharvest cool storage. The objectives of this study were to examine and quantify the physiochemical changes occurring in flesh affected by RDR. Drupelets were classified as ‘fully black’, ‘partially red’, or ‘fully red’. The total anthocyanin concentration in black, partially, and fully red drupelets was 1841 mg kg−1, 1064 mg kg−1 and 769 mg kg-1 fresh weight respectively. Anthocyanins containing acylated or disaccharide sugar moieties were more stable than anthocyanins with non-acylated monosaccharide sugar moieties. The pH of partially red (3.05) and fully red drupelets (3.01) was lower than black drupelets (3.32). Firmness of partially red (1.90 N) and fully red drupelets (1.77 N) was lower than that of fully black drupelets (2.39 N). Examination by light and electron microscopy showed cell disruption, separation, and loss of integrity in the upper mesocarp of affected drupelets. Electrolyte leakage over 24 h was significantly higher from partially red (84.8%) and fully red (90.0%) than fully black drupelets (64.9%). The data are consistent with RDR in blackberries arising from mechanical damage that causes cell decompartmentalisation and subsequent anthocyanin degradation.

Item Details

Item Type:Refereed Article
Keywords:anthocyanin, cell disruption, firmness, electrolyte leakage
Research Division:Agricultural and Veterinary Sciences
Research Group:Horticultural Production
Research Field:Horticultural Crop Growth and Development
Objective Division:Plant Production and Plant Primary Products
Objective Group:Horticultural Crops
Objective Field:Berry Fruit (excl. Kiwifruit)
UTAS Author:Edgley, M (Mr Max Edgley)
UTAS Author:Close, DC (Professor Dugald Close)
UTAS Author:Measham, PF (Dr Penny Measham)
UTAS Author:Nichols, DS (Dr David Nichols)
ID Code:132834
Year Published:2019
Web of Science® Times Cited:2
Deposited By:TIA - Research Institute
Deposited On:2019-05-22
Last Modified:2020-03-30
Downloads:0

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