Effect of ethylene and ethylene inhibitors on the vase life of Eustoma grandiflorum cv. 'Rosa Green' cut flowers
| Autor: | Jia-Rung Tsai, 蔡佳容 |
|---|---|
| Rok vydání: | 2005 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 93 This research studied the effects of ethylene and ethylene inhibitors on the vase life of cut flowers of ‘Rosa Green’ Eustoma [Eustoma grandiflorum (Raf.) Shinn.]. Eustoma cut flowers were treated with ethylene containing air continuously. While 0.1 ppm ethylene had very little effect on the opening of cut flower, ethylene concentration higher than 0.5 ppm accelerated the senescence of the cut flower. The vase life of the cut flower was reduced in parallel with the increase in ethylene concentration. Ethylene also lowered the opening ratio of the flower buds on the cut flower. Excised half-opened and full-opened florets were very sensitive to ethylene. Senescence of the florets was promoted by 0.1 ppm ethylene. On the other hand, excised tight buds and about-to-open buds showed little sensitivity toward ethylene. Exogenous ethylene seemed to promote the opening of flower buds. Treating cut flowers with 0.5 ppm ethylene for 12 hours reduced vase life, and this effect increased with further increase in the duration of treatment up to 48 hours. It took at least 24 hours of the same ethylene treatment to result in the reduction of flower bud opening ratio, and further inhibition was observed for the 48 hours treatment. Ethylene effect was more pronounced in florets with more advanced maturity as well as in florets with longer exposure to ethylene. Treating cut flowers with 0.1 ppm 1-methylcyclopropene(1-MCP), an ethylene action inhibitor, before exposing them to 0.5 ppm ethylene for 48 hours, effectively extended the vase life and improved flower quality. 1-MCP significantly delayed the senescence of excised half-open and full-open florets, but had little effect on the opening of excised buds. For cut flowers held under ethylene-free air, 1-MCP had little effect on vase life extension. Among the ethylene inhibitors used, 2 mM α-aminoisobutyric acid(AIB) and 0.1 mM silver thiosulfate(STS) had better effect in extending the vase life of cut flower, while aminooxyacetic acid(AOA) showed no effect. Ethylene inhibitors were ineffective in extending vase life and in improving flower quality for flowers that had not been treated with 0.5 ppm ethylene for 48 hours. When the cut flowers were held under ethylene containing air continuously, their ethylene production rate and respiration rate were enhanced. The higher the ethylene concentration, the greater the ethylene production and respiration rate. Treating cut flowers with 0.5 ppm ethylene for more than 24 hours also enhanced the ethylene production and respiration rate. This effect was blocked by pre-treating the cut flower with 1-MCP. For those flowers that were not exposed to 0.5ppm ethylene, STS and 1-MCP treatment enhanced their ethylene production rate. The respiration of the cut flower reached its peak 1-2 days ahead its ethylene production peak. Cut flowers that had higher ethylene production rate and respiration rate had faster rate of flower senescence. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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