Revista Brasileira de Fruticultura
Print version ISSN 0100-2945
AMARANTE, Cassandro Vidal Talamini do; MEGGUER, Clarice Aparecida and BLUM, Luiz Eduardo Bassay. Effect of preharvest spraying with thidiazuron on fruit quality and maturity of apples. Rev. Bras. Frutic. [online]. 2003, vol.25, n.1, pp. 59-62. ISSN 0100-2945. http://dx.doi.org/10.1590/S0100-29452003000100018.
Apple trees, cultivars Gala and Fuji, were sprayed at full bloom with thidiazuron (TDZ) at the doses of 0, 5, 10, or 20 g (a.i.) ha-1 and fruit were assessed for quality and maturity. In both cultivars, the increase of TDZ dose had detrimental effects on fruit quality, causing a reduction of fruit red surface and an increase of percentage of fruit that was asymmetrical and with calyx-end rot. TDZ caused an increment of calyx-end aperture that might have increased calyx-end rot. TDZ increased density and the length : diameter (L : D) ratio of the fruit. The number of viable seeds was not affected by TDZ. TDZ resulted in a substantial delay of fruit maturity in 'Gala' but not in 'Fuji'. TDZ also reduced soluble solids content (SSC) in 'Gala' and reduced titratable acidity in both cultivars.
Keywords : Malus domestica Borkh.; cytokinin; diphenylurea; skin color; fruit shape; calyx-end rot.