Enzyme Development and Glyoxysome Characterization in Cotyledons of Cotton Seeds 1

AUTOR(ES)

Bortman, Stephen J.

RESUMO

Unimbibed, mature cotton seeds (cv. Deltapine 61) were found to possess activity for all gluconeogenesis-related enzymes examined, except for isocitrate lyase activity. This indicates that transcription and translation of most enzymes needed for postgerminative growth takes place during seed maturation. This is in contrast with the generalization that “germination” enzymes are synthesized de novo from previously untranslated mRNAs conserved in dry seeds. All enzyme activities increased 3-fold or greater following imbibition, and most remained constant after reaching their peak. Notable exceptions were activities for three β oxidation enzymes and fructose bisphosphatase, which decreased precipitously after peaking with other enzyme activities.

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