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| Author(s): |
Gabriela Maria Geerdink
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Piracicaba. |
| Institution: | Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) |
| Defense date: | 2012-06-22 |
| Examining board members: |
Ricardo Alfredo Kluge;
Glaucia Moraes Dias;
Paulo Hercílio Viegas Rodrigues
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| Advisor: | Ricardo Alfredo Kluge |
| Abstract | |
The objective of this study was the development of technologies to increase the quality and vase life of cut roses (Rosa hybrida.) Vega. The pre-harvest treatments were the application of silicon (0, 200, 400 and 800 mg L-1) via foliar spray and root feeding, in quality of cut roses. Six weekly applications of potassium silicate (12% Si) were performed on roses Vega, distributed in a randomized block design with four replicates per treatment, and six evaluations (days 0, 2, 4, 6, 8 and 10). After harvest, the stem length, stem diameter, peduncle diameter, bud length and mass of the stems were evaluated. The flowers were kept in vases with deionized water, stored at 20±1°C and 65±5% RH, with evaluati ons of loss of fresh weight, leaf and petal relative water content (RWC), peroxidase activity, flower opening, bent neck, turgidity, petal darkening, and color of petals. The application of 400 mg L-1 of silicon provided increase in stem length, in petal RWC, petal chromaticity and reduced peroxidase activity. The application via foliar spray also increased bud length, the leaf RWC and the petal luminosity. The root feeding also increased the stem diameter, the floral opening, the initial mass, and reduced the fresh weight loss, indicating that the application of silicon can improve the quality of roses Vega. The postharvest treatments were the application of 0,1 mM of methyl salicylate (MeSa), 1 L L-1 of 1-methylcyclopropene (1-MCP), and 1 mM of salicylic acid (SA), in postharvest quality conservation of Vega roses. After the application of treatments for 12 hours, the flowers were kept in vases with deionized water, stored at 25±1°C and 65±5% RH. The experimental design was completely randomized, with four replications and six evaluations (days 0, 2, 4, 6, 8 and 10). The treatments with SA and 1-MCP reduced respiratory activity, ethylene production, loss of fresh weight and bent neck; and enable better maintenance of petal relative water content, largest flower opening and higher petal luminosity. SA also provided better maintenance of turgidity and leaf relative water content and less petal darkening. (AU) | |
| FAPESP's process: | 10/02976-7 - Effect of treatments pre-and post-harvest on quality of cut roses |
| Grantee: | Gabriela Maria Geerdink |
| Support Opportunities: | Scholarships in Brazil - Master |