Data/hora: 24/06/2024 17:51:00

Biblioteca(s): | Embrapa Instrumentação.
Data corrente: | 22/02/2005
Data da última atualização: | 03/08/2009
Autoria: | CALBO, A. G.; NERY, A. A.; HERRMANN, P. S. P.
Título: | Intracellular deformation in compressed organs.
Ano de publicação: | 1995
Fonte/Imprenta: | Annals of Botany, London, v. 76, p. 365-370. Anais... London, 1995.
Idioma: | Inglês
Conteúdo: | lntercellular deforrnations, caused by increasing levels of compression applied by apressure chamber to an organ covered with a plastic sealant and evaluated according to the internal atmosphere removal rate, were observed in carrots (Daucus caro ta L. sativa), potatoes (Solanum tuberosum L.) and sweet-potatoes (Ipomoea batatas L. Lam). The maximum internal gas volume removed in these kinetic assays was close to the intercellular air volume (vg) measured by the pycnometric method. Presumably a compression larger than the average organ turgor was required to remove alI vg, and above this point the cells should become completely flattened against each other. The intercellular deforrnation caused by a compressing load, observed by constant pressure volumetry, induced a reduction in the endogenous O2 concentration at the stressed area, according to polarographic measurements. Cellular deforrnations and eventual vg flooding caused by water movement from ,the symplasm to the apoplasm of externally compressed organs were distinct from the usual pressure chamber assays, where alI cells are exposed to homogeneous gas pressurization, without the development offorces to cause large cellular deforrnation and intercellular flooding. These gas transport restrictions were suggested as potential causes for post harvest deterioration in fragile commodities subjected to compression.
Palavras-Chave: | Câmara de pressão; Compressão; Sucção; Sweet potato; Volumetria de gás.
Thesagro: | Batata; Cenoura; Daucus Carota; Ipomoea Batatas; Oxigênio; Porosidade; Solanum Tuberosum; Stress.
Thesaurus Nal: | turgor.
Categoria do assunto: | --
Registro original: | Embrapa Instrumentação (CNPDIA)
Exemplares: | CNPDIA - (8660-1) - UMT - SP - -- - PROCI-95.00007 -  - 1995.00007 - DIS