Stimulation of Lateral Bud Growth of Apple Trees by 6-Benzylamino Purine1

Abstract

Orchard and greenhouse experiments were conducted to determine the influence of foliar applications of 6-benzylamino purine (BA) on branching of young apple trees. BA at 100 and 500 ppm, applied to actively growing shoots stimulated lateral bud growth on these shoots during the current season. The presence of fruit, termination of shoot growth, and the localization and non-persistence of BA reduced its effectiveness in breaking apical dominance. For optimum response to BA, multiple spray applications to actively growing shoots in a non-fruiting condition were required. Spray applications of BA failed to induce lateral bud growth on previous season’s wood.

Effect of BA + GA4+7, BA, and Daminozide on Growth and Lateral Shoot Development in Peach

“…BA was ineffective for inducing lateral shoot formation in all treatments. These results are contrary to reports that BA applications on apple have been very effective for shoot induction (8,16). Furthermore, BA had either no effect on growth or was detrimental.…”

“…Carpenter with apple (8). There were no differences in final node number between BA-treated and control trees.…”

Promoting Bud Development and Branching of Scotch Pine with 6-BA

“…Cytokinin applications have been shown to promote lateral bud growth and branching in woody species such as apple (2,6,10,12), Macadamia (1), Citrus (8), and rose (9). The authors hypothesized that some of the time and expense involved in shearing coniferous trees might be reduced with applications of cytokinins to the plants.…”

Branching Responses of Young Apple Trees to Applications of 6-Benzylamino purine and Gibberellin A4 + 71

“…The superiority of well-feathered apple trees from the nursery is well-established (13,18,19). The discovery that certain growth regulators could stimulate lateral shoot development (7,9,11,17,20) prompted numerous studies of chemical induction of feathering in nursery stock (4,14,16,17). In addition to feath ering of nursery stock, the rapid development of secondary branching after planting in the field is an importannt factor in early productivity (3,8,10,17).…”