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Dormancy and germination in wheat embryos: ribonucleases and hormonal control

Spanò, C., Buselli, R., Grilli, I.
Biologia plantarum 2008 v.52 no.4 pp. 660-667
Triticum turgidum subsp. durum, abscisic acid, cordycepin, cycloheximide, dormancy, germination, gibberellic acid, hormonal regulation, metabolism, ribonucleases, transcription (genetics), translation (genetics), wheat
Acidic and neutral ribonucleases (RNases) were studied in embryos of Triticum durum cv. Cappelli and the effects of abscisic acid (ABA) and gibberellic acid (GA₃) were analysed. RNases activities increased during germination and were comparable in dormant and non-dormant embryos imbibed for 24 h. ABA generally inhibited ribonucleolytic activities, while GA₃ only affected dormant embryos. To assess whether changes in RNase activities during germination or following hormonal treatment required new transcriptional or translational action, cycloheximide or cordycepin were used. The action of inhibitors of acidic RNase activity was found only in non-dormant-embryos. Findings obtained in the present work concur with a change of the ribonucleolytic pattern in the shift from dormant to non dormant metabolism.