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. 2017 Oct 31;8:1874. doi: 10.3389/fpls.2017.01874

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Copyright © 2017 Kebrom.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

PMC Copyright notice

Old and current theories of apical dominance. (A) Three theories, direct (1), diversion (2) and indirect (3), were proposed in the 1930s to explain how auxin from the shoot apex might inhibit axillary bud outgrowth. The direct and diversion theories were investigated in detail and are now replaced with the current auxin transport canalization (B) and second messenger (C) theories, respectively. The indirect theory of the 1930s has been generally overlooked.