Abstract:

In this article, the op timum p retreated concentrations of GSH (glutathione) and its biosynthetical inhibitor, BSO〔L-buthione ( S, R) sulfoximine〕, were determined firstly according to their effects on vase quality of the flowers after 24 h water deficit stress in cut rose (Rosa hybrida) ‘Samantha’. Effects of 2 mmol /L GSH and 2 mmol/L BSO pretreatments for 12 h on water potential of flower bud, MDA (malondialdehyde ) and GSH contents, and GR (glutathione reductase) activity in petalswere investigated. The results showed that GSH pretreatment markedly increased water potential, but significantly decreased MDA content, GSH content and GR activity obviously increased during vase when compared with stress control flowers. The contrary results were obtained in 2 mmol/L BSO pretreated flowers. These results above indicate that the improvement of GSH on tolerance to water deficit stress is possibly be related to the enhancement of GR activity in petals of cut rose 'Samantha’.

Key words: Rose, Cut flower, Water deficit stress, GSH, Glutathione reductase