Chlorophyll degradation in the bract of dragon fruit (Hylocereus spp.)

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Author listKammapana L., Jitareerat P., Wongs-Aree C., Srilaong V., Yamuchi N.

PublisherInternational Society for Horticultural Science (ISHS)

Publication year2015

JournalActa Horticulturae (0567-7572)

Volume number1088

Start page79

End page84

Number of pages6

ISBN9789462610828

ISSN0567-7572

eISSN2406-6168

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84940122066&doi=10.17660%2fActaHortic.2015.1088.8&partnerID=40&md5=271610b4c5cf13f0ae009e0325f8f498

LanguagesEnglish-Great Britain (EN-GB)


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Abstract

Loss of greenness in the bract due to chlorophyll (Chl) degradation is one of the symptoms of senescence in dragon fruit (Hylocereus spp.). Chl degradation enzyme activities (chlorophyllase - Chlase, Mg-dechelatase - MD, chlorophylldegrading peroxidase - Chl-POX and pheophytinase - PPH), Chl derivatives (chlorophyllide a - Chlidea, pheophorbide a - Pheide a, pheophytin a - Phein a and 132-hydroxychlorophyll - OHChl a), and Chl content were assayed during storage at 25ฐC. Chl a content decreased with storage while Chl b content remained unchanged. Chlase activity increased after one day of storage and decreased thereafter. MD and PPH activity increased gradually for the first two days of storage while Chl-POX activity increased during the first five days of storage and then decreased. Chlide a, Pheide a and OHChl a were undetectable throughout storage, while Phein a increased during storage. The results indicate that MD and PPH may be involved in Chl degradation. Chl derivatives, particularly Pheina, were accumulated as intermediate products during Chl degradation.


Keywords

Chlorophyll degradation enzymes


Last updated on 2023-23-09 at 07:36