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. 2023 Jan 11;74(6):1926–1939. doi: 10.1093/jxb/erad017

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© The Author(s) 2023. Published by Oxford University Press on behalf of the Society for Experimental Biology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 7. — Mechanism for leaf blade development. (A) Expression of AN3::GUS in Col-0 and mutants. Top: expression of AN3::GUS in Col-0 at day (d) 8, d10, and d12 and the expression of AN3::GUS in leaf 5 (inset in image of d12) when it is at similar length to leaf 1 at d12. Middle: expression of AN3::GUS in bop1/2 at similar developmental stages to Col-0. Bottom: expression of AN3::GUS in rSPL13 plants at similar developmental stages to Col-0. Scale bars: 2 mm. Arrows indicate the expression of AN3::GUS in Col-0, bop1/2 double mutant, and rSPL13 plants at the proximal region of the blade. (B) Model for juvenile leaf and adult leaf development. In juvenile leaves where miR156 levels are high, miR156-targeted SPL levels are low, and BOP1/2 are activated, resulting in early establishment of the blade–petiole boundary and shorter blades. In adult leaves where miR156 levels are down-regulated, miR156-targeted SPLs are up-regulated and BOP1/2 are down-regulated, resulting in delayed establishment of the blade–petiole boundary and longer blades.