Abstract

FAQUIM, Rudival; SILVA, Ivo Ditos da  and  CARVALHO, Ruy Inacio Neiva de. Chill requirement for budbreak of japanese persimmon cv. Fuyu. Rev. Bras. Frutic. [online]. 2007, vol.29, n.3, pp. 438-444. ISSN 0100-2945.  http://dx.doi.org/10.1590/S0100-29452007000300007.

This work aimed to evaluate the chill requirement for bud break of Japanese persimmon cv. Fuyu. The branches were collected in five dates (April 26^th; May 14^th; June 21^st; July 19^th, and August 16^th) and received five chill treatments (0, 168, 336, 504, 672 h) in the refrigerator (4ºC to 7ºC). The evaluation of dormancy was observed by the biological test of single node cuttings by following variables: average time for budburst (TMB), velocity of budburst (VB), final rate of budburst (TF) and rate of vigorous budburst (TBV). The experimental design was a factorial entirely randomized with five dates and five periods of chill treatment with three replications. Terminal and lateral buds were analyzed individually. The bud break of terminal and lateral buds of Japanese persimmon cv. Fuyu occurred in August after the treatment with 504 h of chill (4ºC to 7ºC), when 100% of budburst was obtained.

Keywords : Diospyros kaki L.; endodormancy; plant physiology; budburst.