Effect of reactive oxygen species on floral senescence in Hibiscus syriacus L.

Abstract

To understand the effect of reactive oxygen species (ROS) on floral senescence in Hibiscus syriacus L., we have investigated change in relative water potential, malondialdehyde (MDA) content, H2O2 content and the activity of antioxidative enzymes in the petals during flower opening and senescence. Hibiscus flowers were achieved full bloom at early morning and started to in-rolling and showed petal in-rolling over than 50% at 24 h and 36 h after full bloom, respectively. The flower was a decrease in fresh weight by 30% and showed water loss with floral senescence. MDA content and activity of antioxidative enzymes such as APX, GR and CAT were showed no significant change until 36 h after full bloom. In the flower 48 h after full bloom that showed complete petal in-rolling and wilting, however, activity of antioxidative enzymes and H2O2 content was greatly increased as compared with 0 h after full bloom. These results suggest that reactive oxygen species are related to accelerating the later senescence more than inducing the early senescence during Hibiscus flower senescence.

Effects of Plasma Activated Water on the Postharvest Quality of ‘Siberia’ Lily

“…In general, water conditions in plants are measured using the method used to measure the relative water content (Lee et al, 2011). It was also reported that relative water content in cut flowers decreases and water content is reduced as they are aging (Seo et al, 2009). In an earlier study, treating 'Manissa' lily with 600 µM of hydrogen peroxide effectively delayed a decrease in relative water content in leaves, which was attributed to abscisic acid (ABA) that controls the closing of stomata and reduces a loss in water content in leaves (Liao et al, 2012).…”