Study on preservative of Fresh Cut Gladiolus

Research on Fresh Cut Gladiolus flower preservative

Gladiolus hybridus hort) cut flowers are colorful and rich, and the flower appearance is very decorative. It is a bulk commodity in the flower market at home and abroad. The purpose of this experiment is to screen the preservative and its concentration, and to provide practical basis for the preservation of Gladiolus cut flowers

1 materials and methods

1.1 materials

Gladiolus at the initial stage of petal selection has a flower stem length of 35cm (CM). After cutting, weigh the initial fresh weight of the flower branches, and immediately insert them into a 500ml (ML) triangular flask containing different preservatives. The triangular bottle is placed at the scattered light of the laboratory. During the bottle insertion, the indoor temperature is 25 ℃ ~ 28 ℃, and the relative humidity is 45% ~ 65%

1.2 treatment

treatment is as follows: 0.5%, 1% and 2% sucrose (code 1, 2 and 3 respectively, push down); Al2 (SO4) (aluminum sulfate) 3 (4, 5, 6) of 200mg/L (mg/L), 250mg/L (mg/L), 300mg/L (mg/L); Citric acid (7, 8, 9) of 100mg/l (mg/L), 300mg/L (mg/L), 700mg/L (mg/L); 8-HQ (8-hydroxyquinoline) (10, 11, 12) of 300mg/L (mg/L), 400mg/L (mg/L), 500mg/L (mg/L); AgNO3 (silver nitrate) (13, 14, 15) of 50mg/L (mg/L), 100mg/L (mg/L), 150mg/L (mg/L); Take distilled water as the control (CK). Each treatment is repeated for 3 times, and the number of flower branch samples in each repetition is 3. The average value represents the result

1.3 measurement index

fresh weight of cut flowers: weigh the fresh weight of flower branches every 12 hours (hours) from the day when the cut flowers are inserted into the solution. Ornamental value of cut flowers: Reference method. Vase life: the end point of vase life is when the viewing value is 0. Water balance value: refer to the method of literature

2 results and analysis

2.1 effect of different treatments on the vase life of cut flowers

treatment 9, 5 and 12 had the best fresh-keeping effect, and the vase life of cut flowers was 5D (days), which was 1 day longer than the control; The fresh-keeping effect of treatments 1, 7, 8 and 6 was the second, and the vase life of cut flowers was 4.5d (days); Treatment 2, 3, 4, 10 and 11 had the worst fresh-keeping effect, and the life span of cut flowers was 4D (days), which was equal to that of the control. This shows that high concentration of sucrose, low concentration of 8-HQ and citric acid treatment can not prolong the vase life of Gladiolus cut flowers, and treatment 5 has the best fresh-keeping effect in the set Al2 (SO4) 3 treatment

2.2 effect of different treatments on water balance value

the ratio of daily water absorption and water loss of flowering branches is the daily water balance value of flowering branches. It can be seen from table 1 that the change trend of water balance value between the control and each treatment is similar: the overall trend is downward, in which the water balance value drops sharply 1 day (day) after bottle insertion, and then the decline speed slows down. In the early stage of bottle planting, the average street value of water is greater than 1, indicating that the water absorption of flowers is greater than the water loss. In the late stage of bottle planting, the water balance value is less than 1, indicating that the water absorption of flowers is less than the water loss. The water balance value of treatment 5, 9 and 12 decreased slower than that of the control, especially in the late stage of bottle insertion, and the water balance value of treatment 3 decreased faster than that of the control. Compared with the vase life, it can be seen that improving the water absorption of flower branches can prolong the vase life of cut flowers. Therefore, treatment 5, 9 and 12 have the longest vase life, while treatment 3 shortens the vase life of cut flowers. The sucrose concentration of treatment 3 was higher and the water potential was lower, which led to the enhancement of the ability to capture water from the flower stems. Therefore, the flower branches lost water faster

Table 1 Effect of various treatments on water balance value of Tangpu cut flowers days after treatment (d)

0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

CK 1.38 0.96 0.90 1.21 0.87 0.67 0.69 0.24

1 1.57 1.02 1.04 0.84 0.85 0.61 0.66 0.45 0.41

2 1.47 0.94 0.89 0.73 0.68 0.55 0.49 0.31

3 1.46 0.58 0.59 0.47 0.43 0.34 0.40

4 1.93 1.13 1.08 0.88 0.74 0.50 0.39 0.21

5 1.45 1.06 0.99 0.98 0.84 0.85 0.77 0.68 0.55 0.50

6 1.58 1.10 1.16 1.08 1.08 0.84 0.86 0.84 0.45

7 1. 6 0.98 0.95 0.60 0.72 0.63 0.57 0.39 0.33

8 1.82 1.10 1.08 1.02 0.95 0.71 0.50 0.55 0.51

9 1.71 1. Results the maximum range was almost unused. Compared with the frequently used range, 130.98 0.94 0.94 0.47 0.63 0.62 0.75 0.31

10 1.93 1.41 1.20 0.91 0.86 0.72 0.50 0.40

11 1.56 1.24 0.94 0.73 0.63 0.49 0.35 0.28

12 1.54 1.03 1.29 1.06 1.05 0.87 0.94 0.60 0.63 0.40

2.3 effect of different treatments on fresh weight of Gladiolus

fresh flower branch 8 deletion test weight change trend first up and then down. In the early stage of vase insertion, the fresh weight of flowering branches increased, and its ornamental value also increased, but when the fresh weight of flowering branches increased to the maximum, the ornamental value was not necessarily the maximum; At the late stage of vase insertion, the fresh weight of the flowering branches decreased, and their ornamental value also decreased. When the ornamental value was 0, the fresh weight of the flowering branches was lower than the initial fresh weight (Tables 2 and 3). When the relative fresh weight (fresh weight of flowering branches/initial fresh weight) ≈ 1, the vase insertion time of treatment 1, 7, 9, 4, 5 and 6 was delayed compared with the control, treatment 10, 11 and 12 were the same as the control, and other treatments were advanced

Table 2 Effects of various treatments on fresh weight of Gladiolus days after treatment (d)

0.5 11.52 2.53 3.54 4.5 5 5

ck 33.5 39.1 39.6 40.1 plastic is bound to replace heavy metal materials in many fields 38.9 36.9 34.2 33.4 30.7

1 35.8 38.5 46.1 46.4 45.8 44.8 43.5 40.2 35.1 34.1

2 44.0 45.4 46.9 34.2 54.8 54.4 50.3 46.8 41.9

3 50.8 52.6 50.7 48.6 47.1 45.0 42.2 41.2 40.2

4 36.9 38.8 45.8 46.8 47.4 46.1 45.4 42.1 36.1

5 38.4 43.0 44.4 45.04 5.7 44.1 43.0 39.8 38.2 36.7 34.7

6 32.1 37.2 38.1 39.3 40.0 41.1 41.5 40.3 34.8 31.2

7 34.5 40.4 41.4 43.3 44.2 44.4 41.4 37.5 36.3 33.0

8 30.0 30.6 31.4 31.9 32.5 32.1 30.9 27.6 25.4 23.0

9 40.5 44.7 46.1 46.5 46.7 46.8 44.6 41.1 39.2 36.6 35.4

10 57.8 60.2 60.4 61.2 61.5 62.1 61.9 61.7 54.9

11 66.4 67.7 73.3 73.9 73.5 74.1 70.6 67.2 62.2

12 57.5 58.0 5 8.5 59.3 59.1 59.4 58.7 57.9 56.5 55.9 53.1

2.4 the effect of silver nitrate on the preservation of Cut Gladiolus flowers

it is observed that cut flowers in silver nitrate solutions of various concentrations appear browning at the base of the flower stems and turbidity of the solution after being inserted in bottles for 12 hours (hours). With the extension of the time of inserting in bottles, the browning part expands upward, and the flower stems immersed in the solution have brown spots. This may be caused by the oxidation of silver nitrate, and may also be related to the physiological order of ag+, so this study believes that silver nitrate is not suitable as a preservative for Gladiolus cut flowers

Table 3 Effects of various treatments on the ornamental value of Gladiolus cut flowers days after treatment (d)

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

CK 0 2 5 7 9 9 7 5 0

1 0 2 5 6 10 11 13 11 6 0

2 0 2 7 9 11 12 12 5 0

3 0 2 3 2 4 5 3 1 0

4 0 3 7 11 14 14 7 3 0

5 0 3 4 6 9 9 5 2 2 1

6 0 3 4 8 9 13 14 8 5 0 0

7 0 1 2 5 7 8 7 4 2 0

8 0 1 2 5 8 8 4 5 2 0 0

9 0 1 2 4 4 5 3 2 2 1

10 0 1 2 3 4 7 3 1 0

11 0 2 5 7 12 12 7 2 0

12 0 1 2 34752200

3 discussion and conclusion

3.1 many studies have shown that sucrose treatment can improve the quality of cut flowers, but this study found that low concentration sucrose solution has no obvious effect on the preservation of Cut Gladiolus flowers, and high concentration sucrose is not conducive to the preservation of Cut Gladiolus flowers

3.2 Han Weimin and other researchers believe that when the fresh weight of flower branches reaches the maximum, the ornamental value of cut flowers also reaches the maximum; When the fresh weight of flower stems approaches the initial fresh weight, the vase life is about to end. However, this study shows that when the fresh weight of flowering branches reaches the maximum, the ornamental value does not necessarily reach the maximum; At the end of vase insertion, the fresh weight of flower branches was significantly lower than the initial fresh weight. The results of this study are inconsistent with them, which may be related to the different test materials, test conditions, test treatment, etc

3.3 considering the bottle life, water balance value, fresh weight change and ornamental value after treatment, the 700mg/L industry pays more attention to the health and safety of automobile users (mg/L). Citric acid (mg/L), 250mg/L (mg/L) Al2 (SO4) 3 and 500 mg/L (mg/L) 8-HQ have the best treatment effect

Author: Wang Yan, ye Qin