Data/hora: 04/06/2024 06:41:09

Biblioteca(s): | Embrapa Unidades Centrais.
Data corrente: | 19/08/2014
Data da última atualização: | 01/06/2017
Autoria: | ANZANELLO, R.; FIALHO, F. B.; SANTOS, H. P. dos; BERGAMASCHI, H.; MARODIN, G. A. B.
Afiliação: | RAFAEL ANZANELLO, Fundação Estadual de Pesquisa Agropecuária; FLAVIO BELLO FIALHO, CNPUV; HENRIQUE PESSOA DOS SANTOS, CNPUV; HOMERO BERGAMASCHI, UFRGS; GILMAR ARDUINO BETTIO MARODIN, UFRGS.
Título: | Bud dormancy in apple trees after thermal fluctuations.
Ano de publicação: | 2014
Fonte/Imprenta: | Pesquisa Agropecuária Brasileira, Brasília, DF, v. 49, n. 6, p. 457-464, jun. 2014.
Idioma: | Inglês
Notas: | Título em português: Dormência de gemas em macieira após flutuações térmicas.
Conteúdo: | The objective of this work was to evaluate the effect of heat waves on the evolution of bud dormancy, in apple trees with contrasting chilling requirements. Twigs of 'Castel Gala' and 'Royal Gala' were collected in orchards in Papanduva, state of Santa Catarina, Brazil, and were exposed to constant (3°C) or alternating (3 and 15°C for 12/12 hours) temperature, combined with zero, one or two days a week at 25°C. Two additional treatments were evaluated: constant temperature (3°C), with a heat wave of seven days at 25°C, in the beginning or in the middle of the experimental period. Periodically, part of the twigs was transferred to 25°C for daily budburst evaluation of apical and lateral buds. Endodormancy (dormancy induced by cold) was overcome with less than 330 chilling hours (CH) of constant cold in 'Castel Gala' and less than 618 CH in 'Royal Gala'. A daily 15°C&#8209;temperature cycle did not affect the endodormancy process. Heat waves during endodormancy resulted in an increased CH to achieve bud requirements. The negative effect of high temperature depended on the lasting of this condition. Chilling was partly cancelled during dormancy when the heat wave lasted 36 continuous hours or more. Therefore, budburst prediction models need adjustments, mainly for regions with mild and irregular winters, such as those of Southern Brazil.
Palavras-Chave: | Chilling hours; Dormancy models; Endodormancy; Endodormência; Horas de frio; Modelo de dormência; Mundaça climática.
Thesagro: | Brotação; Malus Domestica.
Thesaurus Nal: | Climate change.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/106780/1/Bud-dormancy-in-apple.pdf
Registro original: | Embrapa Unidades Centrais (AI-SEDE)
Exemplares: | AI-SEDE - (56594-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS