Abstract:
Microbial blockage in the xylem of cut-rose cv. "Dang Gang-Galar" when holding in vase solution was probably one of postharvest causes in flower wilting and accelerated shelf-life. Efficacy of plant extracts from various herbs (piper, annona, curcuma, tobacco, and galanga) at the different concentrations of 0, 1, 3, 5, 7, and 10% to control microorganisms from used holding solution of cut-rose revealed that piper extract at every concentration showed total inhibition of microbial growth in vitro on mixed solid media. The microorganisms were also completely disinfected in the vase solution containing 1% piper extract as equal as containing 250 ppm 8-hydroxyquinoline sulfate (HQS), resulting of vase-life extension by delaying of bent neck, leaf and petal wilting, and petal bluing. However anthocyanin contents in rose petals were not different between treatments. Furthermore, the additional of 5% sucrose into vase solution could not promote the better quality of cut-rose. Pulsing in 1% piper extract solution with or without 5% sucrose for 4 and 8 hr before holding in distilled water had no effects on inhibition of microbial growth in the holding solution, bud-opening, colour changes of L*, Chroma and Hue angle, and vase-life but could delay bent neck of the cut-rose.