Berry growth changes
Daily berry growth rate has typically two peaks in the
course of the development for both seeded and seedless
berry, those of the first one being eight times and twice
higher, respectively, than those of the second one (Fig. 1).
For ‘Emperatriz’ seedless cultivar, the application of
160 mg L–1 GA3 at the onset of cell enlargement stage
(20 DAA) increased value of the first peak by more
than 300% and anticipated the second one 15 days,
approximately (Fig. 1). As a result of that, berry fresh
weight at harvest increased by 40%, reaching a
commercial size similar to that of ‘Aledo’ seeded grape
(Fig. 1). Differences became significant 20 days after
treatment (40 DAA) and reached maximum 67 DAA.