Exempel på pericarp

• The pericarp appears to form the main natural barrier to desiccation under both natural and artificial conditions of seed storage.

• The seeds are surrounded by the pericarp and sepals and do not become dormant.

• That is obvious, considering the high overlap index of their diet in fruit sizes and vegetable forms eaten (flowers, seeds, pericarps, entire fruits).

• There is no doubt that the presence of a fleshy pericarp is inhibitory to seed germination in some plants.

• One possible factor is the integrity of the pericarp, which acts as a screen against pathogenic infection and also plays an important role in osmoregulation.

• However, if the autumn-winter temperature is low and the soil is damp, the pericarp should afford efficient protection against water loss.

• After removal of the pericarp and testa, 20 seeds from each of the pretreatments, dried as well as undried, were ground in liquid nitrogen.

• Subsequently, the part of the pericarp covering the embryo was removed and the embryo was gently detached from the adjacent tissue using a dissecting needle.

• The tightly woven cell layers of the pericarp are also barriers to gases.

• Increases in embryo osmotic potential and in the turgor yield thresholds of both the radicle and the endosperm/pericarp envelope contributed to this change.

• This procedure was necessary in order to moisten the pericarp and endosperm before excision.

• The endosperm and pericarp consist of non-living tissue and leakage from these tissues is not likely to be influenced by ageing.

• The pericarp surface corresponding to the cupule is rough textured, grey and increasingly thickened from the edges to the centre.

• A marked reduction in the mean rate of water loss was recorded for intact acorns compared with those from which the pericarp had been removed.

• This may be at least partly explained by differences in leakage from the pericarps.