Chlorophyll b degradation (WP2230)

Arabidopsis thaliana

In plants the light harvesting complex around the photosystems contain chlorophyll a and b pigment molecules. both Chlorophyll and b helps in photosynthesis by absorbing light energy. Chlorophyll b is degraded into chlorophyll a and ultimately into phenophytins and pheophorbides.


Pankaj Jaiswal , Alex Pico , Egon Willighagen , Denise Slenter , and Eric Weitz


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Arabidopsis thaliana



Pathway Ontology

porphyrin and chlorophyll metabolic pathway

Cell Type Ontology

obsolete plant cell


Label Type Compact URI Comment
chlorophyll b(chlb) Metabolite chebi:27888
pheophorbide a(pheide a) Metabolite chebi:38257
7-Hydroxymethylchlorophyll a(HMChl a) Metabolite chebi:76032
pheophytin a(phein a) Metabolite chebi:44898
chlorophyll a Metabolite chebi:18230
pheophorbide b(pheide b) Metabolite chebi:38258
pheophytin b(phein b) Metabolite chebi:38256
pheophytinase(PPH) EC: GeneProduct eccode:
7-hydroxymethyl chlorophyll a reductase(HCAR) EC: GeneProduct eccode:
Chlorophyll b reductase (CBR)EC: GeneProduct eccode:


  1. Conversion of chlorophyll b to chlorophyll a precedes magnesium dechelation for protection against necrosis in Arabidopsis. Shimoda Y, Ito H, Tanaka A. Plant J. 2012 Nov;72(3):501–11. PubMed Europe PMC Scholia