02182naa a2200313 a 450000100080000000500110000800800410001910000170006024500520007726000090012952013920013865000110153065000110154165000120155265000180156465000200158265000140160265000150161665000220163165000110165365300240166465300160168865300130170465300170171765300230173470000160175770000230177377300720179610288012009-08-03       1995    bl ---       0--  u    #d1 aCALBO, A. G.  aIntracellular deformation in compressed organs.  c1995  alntercellular 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.  aturgor  aBatata  aCenoura  aDaucus Carota  aIpomoea Batatas  aOxigênio  aPorosidade  aSolanum Tuberosum  aStress  aCâmara de pressão  aCompressão  aSucção  aSweet potato  aVolumetria de gás1 aNERY, A. A.1 aHERRMANN, P. S. P.  tAnnals of Botany, Londongv. 76, p. 365-370. Anais... London, 1995.