Paeonia lactiflora cut flower single-color and compound-color dyeing method

Abstract

The invention discloses a peony cut-flower single-color and compound-color dyeing method which comprises the following steps: (1) preparing a dyeing solution, namely preparing a food coloring into the dyeing solution by using a trehalose solution, and immediately preparing for use; (2) flower cutting pretreatment: pruning flowering branches with the length of about 30cm, leaving two compound leaves below the flowers, obliquely cutting the lower ends of stalks at 45 degrees, and immersing the stalks into a staining solution with the depth of 5-8cm; and (3) dyeing: performing single-color dyeing for 104-193 minutes, taking out the Chinese herbaceous peony to obtain the single-color-dyed Chinese herbaceous peony cut flower, taking out the Chinese herbaceous peony until the color is unchanged, directly inserting the Chinese herbaceous peony into another dyeing solution until the color is uniform, and taking out the Chinese herbaceous peony cut flower to obtain the compound-color Chinese herbaceous peony cut flower. After being dyed, the Chinese herbaceous peony cut flower obtained by the dyeing method is stable and bright in color, more natural in color fusion, more uniform in overall color, better in ornamental effect and more diversified in applicability, and production and consumption can be promoted. And moreover, the ornamental period required by the cut flowers can be reached, and the practical commercial value is achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of cut flower dyeing, and particularly relates to a method for single-color and multi-color dyeing of cut peony flowers by using edible pigments. BACKGROUND

[0002] Peony (Paeonia suffruticosa Andr.) Paeonia lactiflora Peony flowers have various colors, including red, purple, pink, white, multi-color, and inter-color, but except for red and white, other colors such as yellow, orange, and purple are not bright enough and have poor ornamental value, and there is a lack of blue varieties. In order to meet the needs of consumers for diversified flower colors, genetic improvement and genetic modification technologies are widely used to cultivate new and unique flower color varieties, but these two technologies require a long time and it is difficult to achieve the increase and improvement of flower color varieties in the short term.

[0003] At present, the cut flower dyeing technology on the market is developing rapidly, and artificial dyeing has become one of the main ways to change the color of flowers. It is necessary to improve the ornamental value of cut flowers and promote consumption, but the dyeing technology for cut peony flowers is not mature, and it is very important to find a suitable dyeing formula, concentration, and dyeing time for cut peony flowers to enrich the color of peony flowers and increase their ornamental value, which is very important for promoting the production and sales of peony flowers. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a method for single-color and multi-color dyeing of cut peony flowers.

[0005] Technical scheme: In order to solve the above technical problems, the present application provides the following technical scheme: (1) Configuration of dyeing solution: edible pigments are configured into a dyeing solution with a trehalose solution, and the dyeing solution is prepared and used immediately; (2) Pretreatment of cut flowers: the flower stems are trimmed to a length of about 30 cm, and 2 leaves under the flower are left, the lower end of the stem is cut at 45°, and the cut flowers are immersed in the dyeing solution with a depth of 5-8 cm; (3) Dyeing: the single-color dyeing process is 104-193 minutes, and the cut peony flowers are taken out, and the single-colored cut peony flowers are obtained; the multi-color dyeing is carried out until the color does not change, and then the cut peony flowers are taken out and directly inserted into another dyeing solution until the color is uniform, and then the multi-colored cut peony flowers are obtained.

[0006] The edible pigments are selected from one or more of bright blue, lemon yellow, sunset yellow, and grape purple.

[0007] When the edible pigment is lemon yellow, the dyeing concentration is 3 g / L, and the dyeing time is 104 minutes.

[0008] When the edible pigment is grape purple, the dyeing concentration is 3 g / L, and the dyeing time is 110 minutes. When the edible pigment is bright blue, the dyeing concentration is 3 g / L, and the dyeing time is 180 minutes. When the edible pigment is sunset yellow, the dyeing concentration is 3 g / L, and the dyeing time is 193 minutes. Single-color dyeing only needs to be dyed once, and multi-color dyeing needs to be dyed more than twice.

[0009] The environment in which the present application is located is in a room without direct sunlight, at room temperature of 22-25℃, and relative humidity of 50-65%. Beneficial effects

[0010] The peony cut flowers dyed by the dyeing method of the present application have stable and bright colors, more natural color fusion, more uniform overall color, better ornamental effect and more diversified application, which can promote production and consumption. And can reach the ornamental period required by cut flowers, has practical commercial value. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 Single-color dyeing effect diagram of white peony variety 'Yangfei Chubai'; Figure 2 Multi-color dyeing effect diagram of white peony variety 'Yangfei Chubai'; Figure 3 Effect diagram of peony flower diameter increase with different sugar as carbon source. DETAILED DESCRIPTION

[0012] The technical solutions of the present application will be further described below in combination with the drawings.

[0013] Material selection Healthy, slightly open, straight stem, stem length about 30-40 cm, white variety peony cut flower 'Yangfei Chubai' was selected as test material. The flower branches were trimmed before dyeing, about 30 cm in length, with 2 compound leaves left, and the lower end of the stem was cut at 45°. The inclined surface was immersed in clean water. Placed in a laboratory without direct sunlight, room temperature 22-25℃, relative humidity 50-65%.

[0014] Bright blue, grape purple, lemon yellow and sunset yellow are edible pigments allowed to be added or limited to be added by the state, which meet the GB2760-2014 edible pigment use national standard Example 1: Effect of different carbon sources on peony vase flower diameter and prolonged ornamental period The sugar solution of different concentrations was prepared with distilled water to find the most suitable carbon source (Table 1). Among the sugar components, the four sugars had the following effects on the preservation of peony cuttings: trehalose > sucrose > glucose > mannitol. Among them, 20 g / L trehalose had the best effect on cuttings, with an average increase of 2.3 d in the life span of cuttings compared with CK, and an increase of 2.37 cm in the maximum flower diameter compared with CK. The preservation solution of glucose, sucrose and trehalose could increase the flower diameter and improve the ornamental value of cut flowers. Among them, glucose had the best effect on increasing the flower diameter, and trehalose had the effect of delaying flowering and increasing the life span of cuttings.

[0015]

[0016] Example 2: Effect of different concentrations of single-color dyeing solution on the dyeing effect of peony cut flowers.

[0017] With distilled water as the control, four kinds of dyeing solution, bright blue, grape purple, lemon yellow and sunset yellow, were set at three concentrations of 3 g / L, 6 g / L and 9 g / L. After the cut flowers were inserted into the dyeing solution, the relevant dyeing indicators were recorded, and the starting dyeing time (the time when the petals started to color) and the termination dyeing time (the time when the color of the petals no longer changed after coloring) were observed and recorded. The best dyeing state of each dyeing treatment was observed. After the end, the flower branches were washed with distilled water, and the base 5 cm of the flower branches was cut off. Then the cut flowers were moved to the test tube containing the dyeing solution, and the dyeing grade of the petals and the relevant cut flower vase indicators were observed. The vase life and the maximum flower diameter of the cut flowers were measured.

[0018] The cut peony was sensitive to the four kinds of dyeing solution and was easy to be dyed. The sensitivity to sunset yellow dyeing solution was relatively low, and the starting and termination coloring times were later than those of the other three dyeing solutions. The sensitivity to lemon yellow dyeing solution was the highest, and the petals were dyed the fastest and could reach the first-class dyeing standard.

[0019] The experiment proved that different concentrations of dyeing solution also had different dyeing effects on cut peony. The greater the concentration of grape purple, sunset yellow and lemon yellow dyeing solution, the earlier the petals started to color, the later the termination dyeing time, and the relatively shorter the vase life. The dyeing grade of the petals after dyeing with 9 g / L dyeing solution was generally low, at level 3 and level 4, and the vase life was relatively short, about 5 d. Therefore, it is not recommended to use this concentration as a commercial production dyeing cut flower. In addition, the dyeing effect of 6 g / L and 9 g / L bright blue dyeing solution on peony cut flowers 'Yangfei Chubao' was not ideal, and it is recommended to use 3 g / L or even lower concentration of bright blue dyeing solution. In summary, although the dyeing time is longer when the concentration of dyeing solution is 3 g / L, the vase life is the longest, the dyeing effect is better, and the amount of edible pigment required is less. Therefore, it is considered to be the best dyeing solution concentration. The results are shown in Table 3 and Figure 1 .

[0020] Example 3: Influence of different concentrations of single color dyeing solution on the cell sap pH of peony cut flowers after dyeing.

[0021] From the experiment, it can be seen that after the cut flowers are dyed by the dyeing solution, the cell sap pH value in the cut flowers does not change significantly, but with the increase of the concentration of the same dyeing solution, the cell sap pH value of the petals slightly rises. This shows that the absorption of pigment molecules by the cut flowers does not change the physical and chemical environment in the petal cells, which is mainly carried out by plant transpiration and cell penetration. The results are shown in Table 4.

[0022] Example 4: Comparison of different multi-color peony cut flower dyeing methods.

[0023] According to the single color dyeing method, the most suitable dyeing solution concentration of peony cut flower 'Yangfei Chubai' is 3 g / L, two kinds of dyeing solutions with this concentration are selected for two-by-two composite dyeing, and the following two ways are adopted: one is to divide the flower stems below 10 cm at the end of the cut flowers into two parts and insert them into test tubes containing different dyeing solutions; the other is to insert the flower stems into test tubes containing one dyeing solution first, and then insert them into test tubes containing another dyeing solution after the color does not change, and take them out after the color is uniform. By comparing the shapes of the cut flowers dyed by the two multi-color dyeing methods, it can be seen that after the first dyeing method is used to dye the cut flowers, the flowers show obvious color segmentation phenomenon, and due to the different sensitivities of the cut flowers to different single color dyeing solutions, the color saturation is different after the dyeing is completed at the same time, and the phenomenon of half uniform and half marginalization occurs, such as after the composite dyeing of sunset yellow, bright blue and lemon yellow, there is no pigment accumulation on the edge of the lemon yellow petals, but there is pigment accumulation on the edge of the petals of sunset yellow and bright blue, and the ornamental effect is poor; after the second dyeing method is used, the color fusion is more natural, the overall color of the flowers is more uniform, and even a third composite color may be formed, such as fruit green after the composite dyeing of bright blue and sunset yellow, and dark red after the composite dyeing of sunset yellow and grape purple, showing better ornamental effect and more diversified application. The results are shown in Table 5. Figure 2 . Therefore, the method for multi-color dyeing of peony cut flowers is to insert the flower stems into test tubes containing one dyeing solution first, and then insert them into test tubes containing another dyeing solution after the color does not change, and take them out after the color is uniform. The peony cut flowers dyed by the dyeing method of the present application have stable and bright color, the color fusion is more natural, the overall color of the flowers is more uniform, showing better ornamental effect and more diversified application, which can promote production and consumption. And it can reach the required ornamental period of the cut flowers, and has practical commercial value.

Claims

1. A method for dyeing cut peony flowers in single and multiple colors, characterized in that, Includes the following steps: (1) Preparation of dyeing solution: Prepare the dyeing solution by using trehalose solution with food coloring; (2) Pretreatment of cut flowers: Prune the cut flower branches of peony to a length of 28-32cm, leaving 2 compound leaves below the flower, cut the lower end of the stem at a 45° angle, and immerse the lower end of the stem in the dyeing solution to a depth of 5-8cm. (3) Staining: Staining should be carried out in an environment with no direct sunlight, a room temperature of 22-25℃, and a relative humidity of 50%-65%; The single-color staining process takes 104-193 minutes to obtain single-color peony cut flowers; After single-color dyeing is completed, the peony cut flower branches are directly inserted into another dye solution. After the color is uniform, the peony cut flower branches are removed to obtain multi-colored peony cut flowers.

2. The method for dyeing single-color and multi-color peony cut flowers according to claim 1, characterized in that, The food coloring is selected from Brilliant Blue, Tartrazine Yellow, Sunset Yellow, and Grape Purple.

3. The method for dyeing single-color and multi-color peony cut flowers according to claim 1 or 2, characterized in that, The concentration of food coloring in the dyeing solution is 3 g / L.

4. The method for dyeing single-color and multi-color peony cut flowers according to claim 1, characterized in that, The concentration of trehalose in the trehalose solution is 20 g / L.

5. The method for dyeing single-color and multi-color peony cut flowers according to claim 2, characterized in that, When the food coloring is lemon yellow, the staining time is 104 minutes.

6. The method for dyeing single-color and multi-color peony cut flowers according to claim 2, characterized in that, When the food coloring is grape purple, the dyeing time is 110 minutes.

7. The method for dyeing single-color and multi-color peony cut flowers according to claim 2, characterized in that, When the food coloring is brilliant blue, the staining time is 180 minutes.

8. The method for dyeing single-color and multi-color peony cut flowers according to claim 2, characterized in that, When the food coloring is Sunset Yellow, the staining time is 193 minutes.

9. The method for dyeing single-color and multi-color peony cut flowers according to claim 1, characterized in that, The variety of peony cut flowers mentioned is 'Yang Guifei Emerging from the Bath'.

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