Longevidade de cultivares de rosa em resposta ao tratamento com etileno e 1-MCP
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Data
2007-12-12
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Editor
Universidade Federal de Viçosa
Resumo
Os objetivos deste trabalho foram de determinar a sensibilidade ao etileno de sete cultivares de rosa para corte, determinar o período ideal de exposição, a melhor concentração de 1-MCP e, o efeito de aplicações múltiplas de 1-MCP sobre a qualidade pós-colheita das hastes florais de rosa. Para o experimento de sensibilidade ao etileno exógeno, utilizou-se um delineamento inteiramente casualizado com seis repetições em esquema fatorial 5x7, referente a cinco concentrações de etileno (0, 1, 10, 100 e 1000 µL L-1) e sete cultivares de rosa. As cultivares Grand Gala®, Versília, Texas, Konfetti , Tineke, Sandra e Vega, foram expostas ao etileno por um período de 12 horas. As hastes florais da cultivar Grand Gala® apresentaram alta sensibilidade ao etileno, com reduzida vida pós-colheita, enquanto que hastes florais da cultivar Konfetti apresentaram maior resistência aos efeitos do etileno. Para o experimento com 1-MCP, utilizou-se um delineamento inteiramente casualizado com seis repetições em esquema fatorial 3x5, referente a três períodos de exposição (3, 6 e 12 horas) e cinco concentrações de Ethylbloc® (0, 0,1, 0,5, 1,0 e 1,5 g/m3) nas cultivares Grand Gala® e Konfetti . Para as hastes florais da cultivar Grand Gala®, a concentração 1,5 g/m3 de Ethylbloc® e período de exposição de 3 horas promoveram aumento da longevidade floral (7,2 dias). A máxima longevidade foliar estimada foi 5,1 dias para concentração de 1,5 g/m3 de Ethylbloc®. O estádio máximo de abertura das flores foi 4,3 (diversas pétalas abertas), estimado com concentração de 1,5 g/m3 de Ethylbloc®. Para as hastes florais da cultivar Konfetti , a concentração 1,5 g/m3 de Ethylbloc® e período de exposição de 3 horas promoveram aumento na longevidade floral e foliar em 12,1 e 10,8 dias, respectivamente. Na concentração de 1,5 g/m3 e período de exposição 12 horas, o estádio de abertura das flores estimado foi 5,05 (botão floral completamente aberto). Para o experimento com aplicações múltiplas de 1-MCP utilizou-se um delineamento inteiramente casualizado com seis repetições em esquema fatorial 3x2, referente a três modos de aplicação do 1-MCP (simples, dupla e tripla aplicação) e duas concentrações de Ethylbloc® (0 e 1,5 g/m3). As hastes florais das cultivares Grand Gala® e Konfetti tratadas com aplicação simples de 1-MCP, apresentaram maior longevidade floral e foliar, quando comparados com aplicações dupla e tripla.
The objectives of this work were to evaluate the ethylene sensitivity of seven cut rose cultivars, to determine the ideal period of exposition, the best 1-MCP concentration, also the effect of multiple applications of 1-MCP on the quality of postharvest rose flowers. In the ethylene sensitivity experiment, the cultivars Grand Gala®, Versília, Texas, Konfetti , Tineke, Sandra and Vega, were exposed to five ethylene concentrations (0, 1, 10, 100 and 1000 µL L-1), in factorial 5x7 completely randomized design with six replicates. The Grand Gala® cultivar exhibited high ethylene sensitivity, with reduced life postharvest, while the Konfetti cultivar presented higher resistance to the effects of the ethylene. For the first 1-MCP experiment, the Grand Gala® and Konfetti cultivars were used in a factorial 3x5 completely randomized design with six replicates, regarding three exposition periods (3, 6 and 12 hours) and five concentrations of Ethylbloc® (0, 0.1, 0.5, 1.0 and 1.5 g/m3). For the Grand Gala® cultivar, the 1.5 g/m3 concentration of Ethylbloc® and period of exposition of 3 hours increased the flower longevity (7.2 days). The maximum leaf longevity was 5.1 days to 1.5 g/m3 concentration of Ethylbloc®. The greater flower development stage was 4.3 (several open petals), with 1.5 g/m3 Ethylbloc® concentration. For Konfetti cultivar, the 1.5 g/m3 concentration of Ethylbloc® and period of exposition of 3 hours promoted increase in the floral and leaf longevity to 12.1 and 10.8 days, respectively. The multiple 1-MCP application experiment was established in a completely randomized design with six replicates factorial 3x2, regarding three manners of application of the 1-MCP (once, twice and triple application) and two concentrations of Ethylbloc® (0 and 1.5 g/m3). The Grand Gala® and Konfetti cultivars treated with one 1-MCP application exhibited higher flower and leaf longevity compared with two and three applications.
The objectives of this work were to evaluate the ethylene sensitivity of seven cut rose cultivars, to determine the ideal period of exposition, the best 1-MCP concentration, also the effect of multiple applications of 1-MCP on the quality of postharvest rose flowers. In the ethylene sensitivity experiment, the cultivars Grand Gala®, Versília, Texas, Konfetti , Tineke, Sandra and Vega, were exposed to five ethylene concentrations (0, 1, 10, 100 and 1000 µL L-1), in factorial 5x7 completely randomized design with six replicates. The Grand Gala® cultivar exhibited high ethylene sensitivity, with reduced life postharvest, while the Konfetti cultivar presented higher resistance to the effects of the ethylene. For the first 1-MCP experiment, the Grand Gala® and Konfetti cultivars were used in a factorial 3x5 completely randomized design with six replicates, regarding three exposition periods (3, 6 and 12 hours) and five concentrations of Ethylbloc® (0, 0.1, 0.5, 1.0 and 1.5 g/m3). For the Grand Gala® cultivar, the 1.5 g/m3 concentration of Ethylbloc® and period of exposition of 3 hours increased the flower longevity (7.2 days). The maximum leaf longevity was 5.1 days to 1.5 g/m3 concentration of Ethylbloc®. The greater flower development stage was 4.3 (several open petals), with 1.5 g/m3 Ethylbloc® concentration. For Konfetti cultivar, the 1.5 g/m3 concentration of Ethylbloc® and period of exposition of 3 hours promoted increase in the floral and leaf longevity to 12.1 and 10.8 days, respectively. The multiple 1-MCP application experiment was established in a completely randomized design with six replicates factorial 3x2, regarding three manners of application of the 1-MCP (once, twice and triple application) and two concentrations of Ethylbloc® (0 and 1.5 g/m3). The Grand Gala® and Konfetti cultivars treated with one 1-MCP application exhibited higher flower and leaf longevity compared with two and three applications.
Descrição
Palavras-chave
1-MCP (1-metilciclopropeno), Etileno, Rosa hybrida, 1-MCP (1-methylcyclopropene), Ethylene, Rosa hybrida
Citação
BATISTA, Raimundo Junior da Rocha. Longevity of rose cultivars in response to the treatment with ethylene and 1-MCP. 2007. 60 f. Dissertação (Mestrado em Plantas daninhas, Alelopatia, Herbicidas e Resíduos; Fisiologia de culturas; Manejo pós-colheita de) - Universidade Federal de Viçosa, Viçosa, 2007.