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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.

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A model for the inhibition of bud outgrowth by a growing stem. (A) The growth of stem intemodes in auxin or strigolactone deficient mutant plants or plants grown at high light intensity or low planting density is suppressed. A short intemode is not strong sink for sucrose. Therefore, excess sucrose exported from photosynthetic leaves to the stem overflow into axillary buds and induces bud outgrowth. (B) Intrinsic factors such as auxin and strigolactones and environmental factors such as shade promote stem intemode elongation in the main shoot. Elongated intemode, which is a strong sink, inhibits bud outgrowth indirectly by limiting sugar supply to axillary bud.