Invloed van doppenetrasieweerstand op die oesstadium van druiwe

[摘要] ENGLISH ABSTRACT:The possibility of harvesting grapes at an earlier stage of maturity, based ondifferences in glucose and fructose concentration which influence the sweetness ofgrapes, was investigated. Although differences between cultivars were found theextent was not such that a specific cultivar could be selected in order to harvest at alower sugar concentration, but with the same sweetness. Certain characteristics oftable and wine grape cultivars with respect to anatomical composition and skinpenetration resistance (SPR) were also investigated in order to ascertain the extentto which grapes would resist external damage, and to what extent turgor and skinthickness contributed to SPR. Daily variances in SPR confirm that not only skinstrength, but also the turgor of the grape berry contributed to SPR. Skinpenetration resistance seems to be a good criterion of the extent to which cultivarswould resist external damage, because it is based on the toughness of the skin andthe turgor of the berry.

[发布机构] Stellenbosch University