DINÂMICA DA DORMÊNCIA DE GEMAS DE CAQUIZEIRO ‘FUYU’ EM REGIÃO DE BAIXA OCORRÊNCIA DE FRIO

The objective of this work was to evaluate the dormancy dynamic of persimmon tree buds 'Fuyu' during autumn and winter in a region of low chill occurence. The stems were collected in an orchard in Fazenda Rio Grande, Parana State, Brazil, in 10 dates in the period from april to august of 2007 and 2008. In the last date, an addicional group of stems was collected and mainteined in a refrigerator (4 a 7 °C) by 672 h. The evaluation of dormancy was observed by the biological test of single node cuttings under controlled conditions (25 °C and photoperiod of 16 h) by the parameters average time for budburst (TMB), final rate of budburst (TF), average time for open leaves to appear (TMFA), rate of vigorous budburst (TBV) and velocity of budburst (VB). The entirely randomized experimental design was used with 11 treatments and four replications. The two years were analysed individually. The more intense endodormancy period of persimmon tree buds occure from mid may to early june in a region of low chill occurrence.

[1]  Idemir Citadin,et al.  Zoneamento agroclimático para o pessegueiro e a nectarineira no Estado do Paraná , 2008 .

[2]  Rafael Aparecido Peressuti,et al.  Quebra de dormência de pereira 'Hosui' com uso de óleo mineral em dois tipos de condução , 2008 .

[3]  Ruy Carvalho,et al.  Necessidade de frio para quebra de dormência de gemas de caquizeiro 'Fuyu' , 2007 .

[4]  R. Ayub,et al.  SOMATÓRIA DE HORAS DE FRIO E DE UNIDADES DE FRIO EM DIFERENTES REGIÕES DO ESTADO DO PARANÁ , 2006 .

[5]  Ruy Carvalho,et al.  Conteúdo de carboidratos em gemas e ramos de macieira durante o outono e inverno em região de baixa ocorrência de frio , 2004 .

[6]  Ruy Carvalho,et al.  Dinâmica da dormência de gemas de macieira 'Imperial Gala' durante o outono e inverno em região de baixa ocorrência de frio , 2004 .

[7]  José Luiz Petri,et al.  Temperaturas efetivas para a dormência da macieira(Malus domestica Borkh) , 2003 .

[8]  J. Viémont,et al.  Regulation of growth and dormancy in pea axillary buds. , 2000 .

[9]  M. Vandamme,et al.  Dormancy in vegetative buds of peach : relation between carbohydrate absorption potentials and carbohydrate concentration in the bud during dormancy and its release , 1999 .

[10]  A. Mowat.  THE EFFECT OF ROOT TEMPERATURE ON BUD DORMANCY RELEASE OF PERSIMMON (DIOSPYROS KAKI L.). , 1995 .

[11]  Gregory A. Lang,et al.  Endo-, Para-, and Ecodormancy: Physiological Terminology and Classification for Dormancy Research , 1987, HortScience.

[12]  A. Shaltout,et al.  Rest Completion Prediction Model for ‘Starkrimson Delicious’ Apples , 1983, Journal of the American Society for Horticultural Science.

[13]  D. R. Walker,et al.  A Model for Estimating the Completion of Rest for ‘Redhaven’ and ‘Elberta’ Peach Trees1 , 1974, HortScience.