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This study presents the influence of BA (6-benzyladenine) and BA+GA4+7   (6-benzyladenine + gibberellic acids 4 and 7) on feathering of one-year-old   apple trees of two cultivars Jonagold and Čadel. Different concentrations of   BA (300, 600, 1,200 and 1,800 mg L-1) and BA+GA4+7 (500, 1,000, 1,500 and   2,000 mg L-1) were applied, and two treatments for both chemicals were   performed. The first treatment was applied at 70-cm height of nursery trees   and the second 2 weeks later. Comparison was performed in relation to   untreated control. An application of BA and BA+GA4+7 did not affect both   rootstock and nursery tree diameter at 10 cm above the grafting union.   Nursery trees of cultivar Jonagold were not influenced by treatments applied,   whereas in cultivar Čadel, the treatment with BA+GA4+7 decreased apical   growth of nursery trees. The development of sylleptic shoots in both   cultivars tested was influenced by the type of growth regulator and   concentration applied. Treatment with BA at 300 mg L-1 concentration in both   cultivars tested did not influence total length and number of sylleptic   shoots, as well as the number of sylleptic shoots longer than 20 cm. The most   positive influence on all studied parameters was observed on nursery trees   treated with the concentration of 1,200 mg L-1 BA. The lowest concentration   of BA+GA4+7 (500 mg L-1) caused the low feathering of both studied cultivars.   The higher concentrations (1,000, 1,500 and 2,000 mg L-1) similarly increased   the number and total length of sylleptic shoots of nursery trees. [Projekat   Ministarstva nauke Republike Srbije, br. TR31063 i br. III46008

The influence of BA and BA+GA4+7 on formation of sylleptic shoots on one-year-old apple nursery trees