Resumo

BOLIVAR CHAVEZ, Pedro Alberto; MORA CASTILLO, Alejandro; FLOREZ RONCANCIO, Víctor Julio  e  FISCHER, Gerhard. a-NAPHTALEN ACETIC ACID PROLONGS VASE LIFE OF CUT ROSES. Rev. Fac. Nac. Agron. Medellín [online]. 2005, vol.58, n.2, pp.2883-2892. ISSN 0304-2847.

In Colombia , there are approximately 2500 ha grown in roses for the purpose of exportation. In order to improve the postharvest behavior of cut roses grown under greenhouse conditions, a study was conducted with the 'Madame Delbard' rose variety, combining pre and postharvest treatments. At preharvest: (1) Foliar sprays of Hormonagro ANA^â, and (2) Control. At postharvest: (1) Floríssima 825^â; (2) Inmersion of the stems in a solution of 0,2 % Klip Calcio^â 8.4 % (CaO) during 15 s and Floríssima 825^â 1 %; (3) 1-Methylcyclepropene (1-MCP) 0,5 gm^-3 plus Florissima 825^â 1 %; (4) 200 mgL^-1 of 8-hydroxyquinoline citrate (8-HQC) solution plus 800 mgL^-1 of aluminium sulphate (Al₂(SO₄)₃) plus 2% sucrose (C₁₂H₂₂O₁₁) and (5) calcium hypoclorite (Ca(ClO)₂) 2 %. The post-harvest handling consisted of hydration, pulsing, storing and transport simulation. The longest vase life was obtained with ANA treatments (ANA plus Florissima, 10,3 days; ANA plus Florissima plus calcium, 9,3 days; and ANA plus Florissima plus 1-MCP, 8.3 days); and the shortest vase life was obtained with the 8-HQC plus Al₂(SO₄)₃ plus sucrose treatment. The interaction of ANA plus Florissima reduced bent-neck significantly and increased water consumption as compared to the other treatments. There was a synergestic effect between ANA and CaO, which decreased the senescent process.

Palavras-chave : Rosa x hybrida; calcium; a-naftalenacetic acid (ANA); bent-neck; flower bud abscission; source sink relation.

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