Application of plant growth hormones in fresh cut flowers
Preservative solution of fresh cut flowers is not only made up of water, sugar, fungicides, ethylene inhibitor or antagonist, inorganic salts, but also needs to add some plant growth hormone which can effectively delay senescence and improve the quality of cut flowers.
Commonly used in the cut flower preservative of plant growth hormones have five classes.
Commonly used cytokinin are kinetin, isopentenyl adenosine(iPA) and so on, and the application can be sprayed or dipping method. If you use 10 to 50 mg/l solution of cytokinin dip the cut stems for 2 minutes, can slow the carnations, roses, irises, tulips and other flowers of the ageing process. In addition, cytokinin can also be used during storage and transportation of cut before processing, which can reduce the loss of chlorophyll in the dark.
Gibberellin can delay the senescence of carnation, extend the vase life of amaryllis, lilies. In addition, the GA can inhibit six flowers, lilies and other flowers at the loss of chlorophyll in leaves during storage and transportation. 20 to 35 mg/l of gibberellin solution can promote carnations and gladiolus flowers after storage. With 1 mg/l gibberellic acid solution treatment violet cut, will extend its lifetime after picking. With 1 mg/l gibberellic acid solution to deal with violet cut flowers, which can extend its life after picking. With 100-400 mg/l gibberellic acid solution to deal with Hippeastrum cut flowers that can significantly prolong their vase life.
Auxin has a dual role in delay and promote senescence of cut flowers. The effects on the different varieties of cut flowers is inconsistent, on poinsettia can delay aging, but on carnations will accelerate aging. In terms of carnations, different concentrations of auxin, the reaction is not the same, low concentrations can promote carnation senescence, while high concentrations may retard the aging carnation. In some cut flower preservative solution, often adding NAA ,2,4-D and other auxin. In practice of fresh cut flowers, the effect of combined use of auxin and cytokinin is better than just using auxin. For example, with 5 mg/l of cytokinin and 20 mg/l NAA mixed solution to deal with the Carnation flower buds, you can speed up its opening; with 100 mg/l cytokinin plus 22 mg/l 2,4-D mixture to dip, can delay the narcissus senescence.
d. Plant growth retardants
Plant growth retardants such as daminozide, chlormequat and paclobutrazol, can hinder plant tissues gibberellin biosynthesis, thereby inhibiting the growth of cut flowers plants and extend the life of cut flowers after the cut mining.
Such as using 10-50 mg/l CCC or daminozide solutionto deal with, you can extend the vase life of cut flowers about tulips, violets, snapdragon, carnation and so on; Another example is with 5 mg/l paclobutrazol solution to deal with jasmine, can extend its vase life.
e. Plant growth inhibitor
Plant growth inhibitors can delay the senescence of cut flowers and extend its shelf life. For example, add 2,500 mg/l maleic hydrazide in the preservative have a good role in preservation on the rose, chrysanthemum and snapdragon, etc. ; With the addition of 50 mg/l maleic hydrazide preservation solutionprocessing Dahlia, with the addition of 250-500 mg/l maleic hydrazide preservation solution processing lupine and snapdragon, can extend the vase of cut flowers and the life after pick and cut. Moreover, with the addition of 5,000 to 10,000 mg/l maleic hydrazide preservative solution to deal with rose for half an hour, and then at 100 mg/l of aluminum sulfate with 800 mg/l Citric Acid solution for 24 hours, can significantly delay the senescence of cut rose.