Agriculture Reference
In-Depth Information
Sedoheptulose-7-phosphate
Transaldolase
Erythrose-4-phosphate
Glyceraldehyde-3-phosphate
Transketolase
Fructose-6-phosphate
Phenyl propanoid
pathway
Epimerase
Nucleic
acid
Xylulose-5-phosphate
Ribose-5-phosphate
Chalcone
Pentose phosphate
isomerase
Anthocyanins
Ribulose-5-phosphate
Isoprenoids
(carotenoids)
CO
2
NADPH
6-Phosphogluconate
dehydrogenase
Pyruvate
NADP
6-Phosphogluconate
Glucose-6-phosphate dehydrogenase
NADPH
Glucose-6-phosphate
Glycolysis
NADP
Antioxidant (enyme) system
NADPH
pool
GR
DHAR
NADP
+
DHA
GSH
NADP
+
NADPH
MDHAR
MDHA
NADPH
GSSG
ASA
Mitochondria
chloroplast
SOD
APX
O
−
O
2
H
2
O
2
H
2
O
POX
CAT
2H
+
Membrane
degradation
H
2
O
Fig. 3.5
Oxidative pentose phosphate pathway in plants. NADPH generated from the pentose phosphate path-
way is channeled into the antioxidant enzyme system where the regeneration of oxidized intermediates requires
NADPH. GSH, reduced glutathione; GSSG, oxidized glutathione; ASA, reduced ascorbate; MDHA, monodehy-
droascorbate; DHA, dehydroascorbate; GR, glutathione reductase; DHAR, dehydroascorbate reductase; MDHAR,
monodehydroascorbate reductase; SOD, superoxide dismutase; CAT, catalase; POX, peroxidase; APX, ascorbate
peroxidase.
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