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Fig. 6 | BMC Plant Biology

Fig. 6

From: The role of invertases in plant compensatory responses to simulated herbivory

Fig. 6

Simplified model representing function of all forms of invertase enzymes—cell wall (CWINV), neutral/cytosolic (NINV) and vacuolar (VINV). Sucrose is hydrolyzed by invertase to yield glucose and fructose. Fructose is phosphorylated by hexokinase (HXK- shown as orange circles) and eventually shunted into the glycolytic pathway. Glucose is similarly phosphorylated by HXK, converting glucose to glucose-6-phosphate (G6P) which is used in the oxidative pentose phosphate pathway (OPPP). GLUCOSE-6-PHOSPHATE DEHYDROGENASE 1 (G6PD1) (EC 1.1.1.49) present in the cytosol oxidizes G6P to yield 6-phosphogluconate (6PG) and in the process reduces NADP to NADPH. NADPH is a required reductant for generalized biosynthesis and assimilatory processes. The 6PG is eventually converted to ribulose-5-phosphate (R5P) and erythrose-4-phosphate (E4P), which are major intermediates to the shikimate pathway and nucleic acid biosynthesis [30]

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