Flame Seedless and Red globe considered as most popular grape
cultivars in Egypt, successfully grown under different soil and climate
conditions. Under Al-Minia conditions, these two cvs., faces some problems
such as poor chemical characteristics of berries especially poor coloration.
In order to improving the physical and chemical characteristics of these two
cultivars, field experiment was achieved, included nine treatments: Control,
spraying abscisic acid or ethylene four concentrations (100 ppm, 200 ppm,
300 ppm and 400 ppm). Each treatment was replicated three times, one vine
per each. All treatments were frequently applied three times.
The positive effect of ABA treatments were more clear on berry
physical properties “represented by berry weight and berry dimensions" than
those of ethylene treatments for the two cvs. Furthermore, the response of
“Red globe" cluster and berry physical properties to spraying ABA was
clearer than those of “Flame seedless". The berry chemical properties of the
two cultivars significantly enhanced as a result of spraying the two
examined materials (Ethylene or ABA). However, this positive effect was
clearer for ethylene treatments than those of ABA. The obtained data
confirmed that, non-significant differences were observed between the two
higher concentrations neither for physical properties nor for chemical
properties