ISHS


Acta
Horticulturae
Home


Login
Logout
Status


Help

ISHS Home

ISHS Contact

Consultation
statistics
index


Search
 
ISHS Acta Horticulturae 113: II International Symposium on Post-harvest Physiology of Cut Flowers

ETHEPHON EFFECTS IN CUT 'SONIA' ROSES AFTER PRETREATMENT WITH SILVER THIOSULFATE

Author:   H.C.M. de Stigter
Abstract:
Silver thiosulfate or water pretreatment, the former very effective in preventing ethylene effects in carnations, was applied to cut 'Sonia' roses, and followed by water or ethephon uptake, the latter to simulate ethylene effects. Depending on quantities taken up (concentration times volume absorbed in light or dark), effects with either chemical alone or in combination were the following:

Ethephon alone. Very high conc (4000 ppm short, to 1000 ppm long duration): leaf desiccation, very rapid petal shedding. High conc (1000 ppm short): rapid leaf and petal shedding, no desiccation. Medium conc (250 ppm short): slower but complete shedding. Low conc (60 ppm short): still slower, yet distinctly accelerated petal drop, no foliage shedding. Very low conc (15 ppm short): slightly accelerated petal drop, compared with water controls.

Silver thiosulfate alone. Uptake rates in the light being too high, resulting in leaf damage, STS had to be applied in darkness, for a few hours; 0.2 mM silver nitrate + 0.8 mM sodium thiosulfate were safer to work with than 5 to 10-fold higher concentrations.

Combination. Silver-complex uptake low enough not to cause leaf damage, was sufficient to prevent all of the above ethephon effects (except at the very highest conc). Compared with water controls, silver pretreatment did not extend vase life, however.

  • Full Text (PDF format, 217564 bytes)
  • Citation
  • Translate

Download Adobe Acrobat Reader (free software to read PDF files)

113_2     113     113_4

URL www.actahort.org      Hosted by KU Leuven      © ISHS