Abstract: Dendrobium Sonia and Dendrobium Savin
White are popular Dendrobium hybrids in the Orchidaceae Family
which are ethylene-sensitive and exhibit earlier senescence due to pollination.
Pollinated Dendrobium Sonia and Dendrobium Savin White showed
shorter vase life and initiate earlier perianth senescence that demonstrates
rapid sepal and petal wiltingand discolouration. Experiments were carried
out to observe the changes in antioxidant activities and pigment fading
throughout the flower`s vase life. As Dendrobium Sonia and Dendrobium
Savin White senesces, there is discolouration, the flower appears dull
and weak, which indicates pigment loss and this observation is correlated
with the L* a*/b* colour readings carried out using the Chromameter CR-200.
The total anthocyanin quantification using the pH-differential method
showed that pollinated Dendrobium Sonia had lower concentration
compared to unpollinated Dendrobium Sonia. The total polyphenol
assay on pollinated and unpollinated flowers for both hybrids showed lower
content in those pollinated compared to those unpollinated. The reducing
power assay confirmed that there were antioxidant properties present in
both hybrids and the reducing capability increases with the increase of
dry weight sample.
O.P.S. Rebecca, R. Zuliana, K. Wijenthiran, A.N. Boyce and S. Chandran, 2008. A Comparative Study on Selected Antioxidants During Pollination
Induced Senescence on Dendrobium Sonia and Dendrobium Savin
White. Asian Journal of Plant Sciences, 7: 724-729.