Effect of Cobalt, Silicon, Acetylsalicylic Acid and Sucrose as Novel Agents to Improve Vase-life of Argyranthemum Flowers
This experiment revealed significant influence of cobalt (Co), silicon (Si), Acetylsalicylic Acid (ASA) and Sucrose (SUC) at different concentrations on the vase life of Argyranthemum cut flowers. In this study three levels of cobalt (0, 1 and 2 mM), three levels of silicon (0, 1.5 and 3 mM), three levels ASA (0, 1.5 and 3 mM) and two levels of SUC (0 and 2.5% w/v) were applied in a factorial arrangement, carried out in a complete randomized design on 324 Argyranthemum cut flowers. The recorded traits included Vase life, total chlorophyll content (SPAD reading), anthocyanin leakage, Malondialdehyde (MDA) content, ACC-oxidase (ACO) activity and water absorption. Results show that solution containing 2 mM cobalt, 1.5 mM silicon, 1.5 mM ASA and 2.5% w/v SUC could increase flower longevity in compared to control. Vase life in solution containing 3 mM silicon, 3 mM ASA and their combination didnt have significantly difference than control. The results showed that silicon and ASA treatments increased cut-flower water absorption, fresh weight and vase life, while decreasing MDA content, ACC-oxidase activity and membrane premeability together with total delay of senescence and peroxidation of lipids our results suggest the application of silicon, ASA and cobalt in preservative solutions for Argyranthemum flowers maintained the vase life of flowers for a longer period.
to cite this article:
M. Kazemi , 2012. Effect of Cobalt, Silicon, Acetylsalicylic Acid and Sucrose as Novel Agents to Improve Vase-life of Argyranthemum Flowers. Trends in Applied Sciences Research, 7: 579-583.
Received: January 26, 2012;
Accepted: March 12, 2012;
Published: May 25, 2012
Argyranthemum is a summer flowering that is native to Spain and belongs
to the Compositae family. The flower of Argyranthemum is highly ethylene
sensitive and the longevity of the cut flower is very short. The cut flower
industry is a US$ 2 billion industry and is important revenue for some of the
major cut flower producers in the world (Yamada et al.,
2003; Chandran et al., 2006). Senescence in
the cut flower is affected by three main parameters: the water balance, the
supply of carbohydrates and susceptibility to ethylene, ethylene leads to flower
senescence, shortening of life (Reid and Wu, 1992; Jiang,
2000). The onset of flower senescence can delay by Treatment of flowers
with inhibitors of ethylene biosynthesis or inhibitors of ethylene action.
Three of the preserving agents are Co, Si and ASA that inhibits ethylene synthesis
and reduces sensitivity of flowers to ethylene (Epstein,
1994; Ansari and Misra, 2007; Mahdavian
et al., 2007; Mba et al., 2007; Canakci,
2008; Shi and Zhu, 2008; Karlidag
et al., 2009; Joseph et al., 2010).
Reezi et al. (2009) showed that Si could extend
the vase life of Rose cut flowers by decreasing ROS, malondialdehyde content
and ethylene. Jamali and Rahemi (2011) reported that
treatment with Co significantly extends the vase life carnation. Kazemi
et al. (2011a, b, c,
d) reported that addition of SA and SUC in the preserving
solution increased the vase-life of cut flowers. SUC is another organic molecule
known to delay senescence and prevents up-regulation of senescence-associated
genes in carnation petals (Han, 2003; Kazemi
and Shokri, 2011). In the present study, we test the hypothesis whether
treatment with Co, Si, ASA and SUC or their combination extended the vase life
of cut flowers by reduce senescence of cut flowers.
MATERIALS AND METHODS
Plant material and storage conditions: The experiment was started on August 1, 2011 and chlorophyll content, Membrane stability, MDA content and ACC Oxidase activity were measured. Argyranthemum were obtained from local commercial greenhouses (Pakdasht, Tehran, Iran). Following harvest and transport to the laboratory, the stems were recut to 40 cm in length. In this study three levels of Co (0, 1, 2 mM), three levels of Si (0, 1.5, 3 mM), SUC (0 and 2.5% w/v), three levels of ASA (0, 1.5 and 3 mM) were applied on Argyranthemum cut flowers. After recording the fresh weight, each flower was placed in a 250 mL bottle containing preservative solutions.
Vase life: Vase life was determined as the number of days to wilting of flowers.
Chlorophyll content measurement: Total chlorophyll (a+b) content was measured by chlorophyll meter (SPAD-502, Minolta Co. Japan) which is presented by SPAD value. Average of 3 measurements from different leaves of a single leaves was considered.
Determination of anthocyanin leakage: Anthocyanin leakage was measured
based on the method of Poovaiah (1979).
Determination of ACC-oxidase activity: ACC oxidase (ACO) activity was
assayed by measuring to the method described by Moya-Leon
and John (1994).
Assays of MDA content, lipid peroxidation: Lipid peroxidation rates
were determined by measuring the malondialdehyde equivalents according to Heath
and Packer (1968).
Water uptake and fresh weight: The volume of water uptake was calculated by subtracting the volume of water evaporated from a control bottle without cut flowers from the amount of water decreased in bottles containing flowers. The fresh weight of the cut flowers also measured in initial day and terminal day of experiment.
Superoxide dismutase: The activity of superoxide dismutase was measured
based on the method described by Beauchamp and Fridovich
Experimental design and statistical analysis: Experiment was arranged in a factorial test with complete randomized design with four replications. Analysis of variance was performed on the data collected using the General Linear Model (GLM) procedure of the SPSS software (Version 16, IBM Inc.). The mean separation was conducted by Tukey analysis in the same software (p = 0.05).
RESULTS AND DISCUSSION
Anthocyanin leakage and ACO activity: Significant decrease in anthocyanin
leakage and ACO activity was observed after treated cut flowers with ASA, Co,
Si and SUC (Table 1). Table 1 shows that
significant decreases in anthocyanin leakage and ACO activity were recorded
in Co (2 mM) treatments followed by the low concentration of ASA and Si (1.5
||Mean comparisons of chlorophyll content, vase life, MDA, SOD
activity, membrane stability and ACC oxidase activity in Co, Si, ASA and
SUC treatments and their interaction
The results indicate that the treatment by 2 mM Co+1.5 mM ASA+1.5 mM Si improved
membrane permeability by decreasing anthocyanin leakage and ACO activity in
compared to control (p<0.05). These findings are in agreement with those
reported by Lamikanra and Watson (2001, 2002),
Kazemi and Shokri (2011), Kazemi
et al. (2011a, b, c,
d). Similarity, Zhang et al.
(2003) showed that pretreatment with SA decreased the level of anthocyanin
leakage and ACO activity.
MDA content and superoxide dismutase activity: The results from Table
1 showed that the MDA content and superoxide dismutase activity gradually
decreased and increased (respectively) during vase life (p<0.05). Flower-treated
with ASA and Si at level 1.5 and 1.5 mM, (respectively) significant decrease
and increase malondialdehyde (MDA) content and superoxide dismutase activity
in cut flowers. Co did not affect superoxide dismutase activity in cut flowers.
As Zhang et al. (2003) reported, application
of SA on kiwifruit increased superoxide free radical and enzyme antioxidant
activity. A similar finding in a previous reported by Kazemi
et al. (2011a) found that application of SA on cut flower increased
enzyme antioxidant activity.
Water uptake, fresh weight and chlorophyll content: The results indicated
that Co had no effect to the water uptake and fresh weight in during vase life
(Table 1). Both treating with Si at level 1.5 mM and ASA at
level 1.5 mM stimulated the highest Water uptake and fresh weight after storage
(p<0.05). Argyranthemum flower showed a sharp increase the wilting
incidence after storage. The results showed that flower treated with 1.5 mM
Si+ 1.5 mM ASA appeared the least bract wilting, when compared to control (p
= 0.05). The total chlorophyll content of the flower increased with ASA and
SUC treated cut flowers (Table 1). Chlorophyll content was
not affected by Co treatment. These results are in agreement with those of Kazemi
et al. (2011b, c) who found that adding ASA
and GLU in vase water increased chlorophyll content cut flowers. Similarity,
Canakci (2008) reported that treatment with salicylic
acid significantly extends the vase life with increases chlorophyll content.
Vase life: The results showed that in comparison to the control, all
concentrations of Co prolonged the vase life cut flowers. There were no significant
(p<0.01) differences between 1.5 mM Co and control. Vase life of cut flowers
held in distilled water received to 4 days (Table 1). Holding
Argyranthemum cut flowers in vase solutions containing 2 mM Co+1.5 mM
Si+1.5 mM ASA+2.5 v/w SUC significantly increased their vase life and delayed
flower senescence compared to flowers either held in 3 mM ASA, 3 mM Si or distilled
water (Table 1).
The improvement of vase life of Argyranthemum by the use of Co, Si, ASA and SUC remained approximately for 5 days more compared with control (simple distilled water), which suggests that an extensive research work should be carried out to reach in a final conclusion for using such chemicals to enhance the vase life in Argyranthemum.
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