Data/hora: 29/06/2024 09:26:22

Biblioteca(s): | Epagri-Sede.
Data corrente: | 12/04/2011
Data da última atualização: | 12/04/2011
Autoria: | RAGEAU, R.; BONHOMME, M.; BODET, C.; CROCOMBETTE, M.; RICHARD, J.; LEITE, G. B.; PUTTI, G. L.
Afiliação: | Epagri
Título: | Spatial Features of the Path from the Chilling Receptor to the Bud.
Ano de publicação: | 2010
Fonte/Imprenta: | Acta Horticulturae, Leuven, v. 872, p. 21-30, 2010.
Idioma: | Inglês
Notas: | ISSN, 0567-7572

Conteúdo:

Not many studies have been carried out that aimed at knowing the spatial
features of the transduction of external signals that influence bud endodormancy
release in woody perennials: which structures are able to perceive the signals? which
buds are targets (at the endodormancy release level) of the transduction process
borne in a given receptive structure. Some of these studies concerned temperature at
rather large scales; they generally could not afford definite conclusions at the bud
endodormancy level. Very few studies were at smaller scale: they used warm baths
or active substance application on single buds. Surprisingly, though temperature is
undoubtedly the main natural factor driving the bud endodormancy release, to our
knowledge, no work addressed the effect of temperature per se. We carried out
experiments which consisted in selective chilling of some nodal groups of buds on
shoots of ?Redhaven? peach tree under full endodormancy. A device (temperature
conditioned localized air jets) was designed in order to provide an as sharp as
possible temperature gap between given chilled buds and the ?non-chilled? rest of the
tree structure (the adjacent axis tissue included). During 2 experimental seasons we
tried different chilling doses. The chilled vegetative buds broke or did not,
depending on the chilling dose; most of the broken buds begot long shoots. Neither
the chilled nor the non-chilled floral buds bloomed. We can conclude i) the nodal
group of buds, or a part of it, is a receptor of the chilling signal, sufficient for
initiating a process that releases the endodormancy of its vegetative bud; ii) the
transduction process that is initiated in a given nodal buds group does not reach any
other bud. Different aspects of the results are discussed and prospects for further
experiments on the topic are given.

Palavras-Chave: | Bud; Chilling receptor; Endodormancy release; Peach tree.
Categoria do assunto: | --
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_1095.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (78298-1) - UPC - AP - -- -  -  -  - DIS