Abstract

Abstract Nitric oxide (NO*) and Thidiazuron (TDZ) have been shown to extend the postharvest life of a range of flowers possibly by down regulating ethylene production, delaying leaf yellowing and senescence. In this research the effect of sodium nitroprusside (SNP), as nitric oxide donor and thidiazuron on chlorophyll and anthocyanin content during postharvest of cut Rosa flower was evaluated. Flowers were treated for 24- h at 0, 20, 40μmol L-1 TDZ and 0, 20, 40, 60 μmol L-1 SNP and then held in the solution include 8- HQS at 300ppm combination with 1% sucrose. Experimental results show that treating Rosa flowers with NO and TDZ at a 40μmol L-1concentration and 40μM TDZ with 40μM SNP of appeared to decrease leaf yellowing and senescence of flowers. SNP at 60μmol L- 1 harmed the flowers. Treatment of cut flowers with SNP and TDZ had no effect on anthocyanin content. It was suggested that NO and TDZ inhibited chlorophyll degradation by decreasing ethylene production. Keywords: Rose, Sensiro, nitric oxide, Thidiazuron, pigments content.