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. 2010 Aug 10;154(2):757–771. doi: 10.1104/pp.110.160630

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© 2010 American Society of Plant Biologists

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Figure 10. — Proposed model of the miR159-GAMYB regulatory pathway in Arabidopsis. GAMYB-like proteins are present in the aleurone, indicating low activity of miR159. In this tissue, we hypothesize that they transduce the GA signal for the activation of GA-induced genes, which leads to nutrient secretion and the progression of PCD. Conversely, strong miR159 activity fully represses MYB33 and MYB65 in vegetative tissues, ensuring that aleurone-related genes remain inactive to allow the progression of growth. GA appears not associated with the miR159-GAMYB regulatory module in these tissues.