Lycopene synthesis and related gene expression in pummelo pulp increased in shade-grown fruit

Journal article

Authors/Editors

VARIT SRILAONG

Strategic Research Themes

Postharvest (Sustainable agriculture)

Publication Details

Author list: Paemika Promkaew, Varit Srilaong, Chalermchai Wongs-Aree, Nutthachai Pongprasert, Samak Kaewsuksaeng and Satoru Kondo

Publisher: American Society for Horticultural Science

Publication year: 2020

Journal: Journal of the American Society for Horticultural Science (0003-1062)

Volume number: 145

Issue number: 1

Start page: 60

End page: 66

Number of pages: 7

ISSN: 0003-1062

eISSN: 2327-9788

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85078846844&doi=10.21273%2fJASHS04814-19&partnerID=40&md5=b8bf33a5d5847b9a7b58c7a8c90485ee

Languages: English-Great Britain (EN-GB)

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Abstract

The effects of bagging-induced light reductions on lycopene synthesis and the expression of related genes, antioxidant activity, and sugar composition of ‘Tubtim Siam’ pummelo (Citrus maxima) were investigated. Glucose, ascorbic acid, and flavonoid concentrations and 2, 2-diphenyl-1-picryhydrazyl scavenging activity were decreased in fruit covered with bags while still on the tree [0.01 mmol·m-2·s-1 photosynthetic photon flux density (PPFD)] compared with the untreated control (596.7 mmol·m-2·s-1 PPFD). The bagging treatment significantly decreased the temperatures on the surface in the bag. In addition, the bagging treatment decreased abscisic acid concentrations in the peel and pulp. However, the bagging treatment increased lycopene concentrations, upregulated phytoene synthase (CsPSY) and z-carotene desaturase (CsZDS) gene expressions; downregulated chromoplast-specific lycopene cyclase (CsbLCY), b-carotene hydroxylase (CsbCHX), and e-ring hydroxylase (CsECHX); and decreased 9-cis-epoxycarotenoid dioxygenase (CsNCED1) gene expressions in the pulp. It is possible that maintaining a temperature of’25 8C in fruit covered with bags may increase the lycopene concentration in the pulp with the upregulation of CsPSY and CsZDS and the downregulation of CsbLCY, CsbCHX, CsECHX, and CsNCED1 gene expressions in the pulp. © 2020, American Society for Horticultural Science. All rights reserved.

Keywords

Citrus maxima