Pyropheophorbide und a as a catabolite of ethylene-induced chlorophyll und a degradation
- Miyazaki Univ. (Japan)
- Miyazaki Medical College (Japan)
An enzyme extract prepared from ethylene-induced degreening Citrus fruits contains chlorophyll (Chl) degrading enzymes. The fate of Chl carbons during an enzymatic degradation was investigated using Chl {und a}-{sup 14}C. Accompanying the disappearance of labelled Chl {und a}, pheophorbide {und a} and pyropheophorbide {und a} appeared and accumulation of pyropheophorbide {und a} was observed. HydroxyChl {und a} was also detected, but this is thought to be an artifact during chromatography. Unlike ethylene-induced Citrus fruits (in vivo), further degradation of pyropheophorbide {und a} did not occur in vitro enzyme system. This suggests that there is a lack of enzyme(s) and/or cofactor(s) for further degradation. It is concluded that Chl {und a} degraded enzymatically by the following order: Chl {und a}, chlorophyllide {und a}, pheophorbide {und a} and pyropheophorbide {und a}.
- OSTI ID:
- 5644953
- Report Number(s):
- CONF-9007196--
- Journal Information:
- Plant Physiology, Supplement; (USA), Journal Name: Plant Physiology, Supplement; (USA) Vol. 93:1; ISSN PPYSA; ISSN 0079-2241
- Country of Publication:
- United States
- Language:
- English
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59 BASIC BIOLOGICAL SCIENCES
ALKENES
BIOLOGICAL PATHWAYS
CARBON 14 COMPOUNDS
CARBON COMPOUNDS
CARBOXYLIC ACIDS
CATABOLISM
CHLOROPHYLL
CHROMATOGRAPHY
CITRUS
ENZYMES
ETHYLENE
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
MAGNOLIOPHYTA
MAGNOLIOPSIDA
METABOLISM
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHYTOCHROMES
PIGMENTS
PLANTS
PORPHYRINS
PROTEINS
SEPARATION PROCESSES
TRACER TECHNIQUES