Control of Pyrophosphated-Fructose-6-Phosphate 1-Phosphotransferase Activity in the Cotyledons of Citrullus lanatus | Zendy

AnnaMaria Botha | Zendy; Frederik C. Botha | Zendy

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Control of Pyrophosphated-Fructose-6-Phosphate 1-Phosphotransferase Activity in the Cotyledons of Citrullus lanatus

Author(s) -

AnnaMaria Botha,

Frederik C. Botha

Publication year - 1990

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.93.2.683

Subject(s) - citrullus lanatus , phosphotransferase , fructose , chemistry , phosphate , biology , botany , biochemistry , enzyme

After initiation of radicle elongation, the pyrophosphate:d-fructose-6-phosphate 1-phosphotransferase (PFP) activity sharply increases in the cotyledons of Citrullus lanatus. Removal of the radicle early during incubation prevents the increase in PFP activity in the cotyledons evident in the control. Removal of the radicle at any stage after germination results in a decrease in PFP activity in the cotyledons. Application of kinetin (0.5 micromolar) or 2-chlorophosphonic acid (0.1 micromolar) to isolated cotyledons replaces the effect of the radicle. Gibberellic acid (0.09 micromolar GA(3)) also partially mimics the presence of the radicle. Anaerobic conditions, as well as cycloheximide application (0.18 micromolar) to intact embryos or to kinetin and ethrel treated isolated cotyledons prevent the increase in PFP activity evident in the control.

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