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Evaluation of ethylene production by ten Mediterranean carnation cultivars and their response to ethylene exposure

2011; Spanish National Research Council; Volume: 9; Issue: 2 Linguagem: Inglês

10.5424/sjar/20110902-124-10

2171-9292

Asghar Ebrahimzadeh, S. Jiménez, S. Manzano-Medina, Manuel Jamilena, María Teresa Lao,

Horticultural and Viticultural Research

Vase life is one of the most important characters of postharvest cut flower quality. The onset of ethylene production and the amount of ethylene produced by flowers vary with the carnation cultivar, and thus influence their vase life. In the present study, differences in ethylene production and the response to exogenous ethylene among carnation cultivars were evaluated. Ten different cultivars: ‘Baltico’, ‘Domingo’, ‘Exotica’, ‘Famosa’, ‘Kiro’, ‘Madame Augier’, ‘Master’, ‘Mundo’, Pilar’ and ‘Reina’were studied. Five flowers for each cultivar were exposed for 8 hours to 1 μL L–1 exogenous ethylene concentration. Ethylene production, fresh weight and water uptake was measured daily throughout theexperiments. The 10 different cultivars studied showed clear differences in vase life, ethylene production, onset timein ethylene production and response to exogenous ethylene. The shortest vase life was for ‘Exotica’ flowers which wasonly 11.6 days, while ‘Baltico’ and ‘Pilar’ lasted 2.5-3 times longer than ‘Exotica’. Most of the investigated cultivarsshowed notable increases in the amount of ethylene. However, ‘Baltico’ and ‘Pilar’ flowers produced only a traceamount of ethylene and had the longest vase life. Results showed that cultivars with a long vase life (‘Baltico’ and‘Pilar’) display high ethylene responsiveness and, in contrast, cultivars with a short vase life (‘Exotica’ and ‘Mundo’) present low responsiveness. The decline in fresh weight of cut flowers observed in the last phase of their vase life occurred earlier in short-lived cultivars than in the longer-lived ones.