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Evaluation of the roles of sugars and the phytohormones "auxin and cytokinin" on apical dominance in potato stolons
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Ashkan Abbasian *   , Ali Ahmadi |
| seed and plant certification & registration institute |
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Abstract: (17 Views) |
Apical dominance is a process by which the apical bud (aerial or subterranean) inhibits the growth and development of lateral buds. This phenomenon is one of the key -processes in the growth of potato stolons and plays an important role in determining the timing and pattern of tuber initiation. It is mainly influenced by a complex network of plant signaling molecules, particularly hormones and sugars. Initially, auxin was considered the primary regulator of apical dominance, acting indirectly through secondary messengers (such as cytokines and abscisic acid) to suppress lateral bud outgrowth. However, advanced physiological studies have highlighted the central role of sugars in the regulation of apical dominance. In response to the loss of the shoot apex, plants develop long-distance signaling mechanisms, which lead to the release of lateral buds and the establishment of new growth potentials. The experiment was carried out as a factorial experiment based on a randomized complete block design (RCBD) with four replications in the research greenhouse of the college of agriculture and natural resources of Tehran university, to investigate the effect of apical dominance removal on the behavior of lateral buds in potato stolons, the first stolon was decapitated, and the effects of manipulating carbohydrate (100 ppm sucrose, 100 ppm glucose, and defoliation) and hormonal factors (10 ppm auxin and 10 ppm cytokine) on the growth and development of lateral buds were evaluated. Although extensive studies in recent years have examined carbohydrates as primary regulators of bud growth and development following the removal of apical dominance, the results of this study indicate that the threshold concentration of carbohydrates (sugars), along with the levels of hormones such as cytokine and auxin in potato, play a critical role in determining the activation or inhibition of lateral buds.
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| Keywords: Potato, Auxin, Cytokinine, Sugars and Apical dominance. |
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Full-Text [PDF 795 kb]
(9 Downloads)
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Type of Study: Research |
Subject:
Crop Physiology
Received: 2026/02/10 | Accepted: 2026/03/4 | Published: 2026/03/4
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