Chlorophyll degradation in the bract of dragon fruit (Hylocereus spp.)
Journal article
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Publication Details
Author list: Kammapana L., Jitareerat P., Wongs-Aree C., Srilaong V., Yamuchi N.
Publisher: International Society for Horticultural Science (ISHS)
Publication year: 2015
Journal: Acta Horticulturae (0567-7572)
Volume number: 1088
Start page: 79
End page: 84
Number of pages: 6
ISBN: 9789462610828
ISSN: 0567-7572
eISSN: 2406-6168
Languages: English-Great Britain (EN-GB)
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