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Proc Natl Acad Sci U S A. 2013 Jan 15;110(3):1107-12. doi: 10.1073/pnas.1213497110. Epub 2012 Dec 31.

Local auxin biosynthesis regulation by PLETHORA transcription factors controls phyllotaxis in Arabidopsis.

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  • 1Molecular Genetics, Department of Biology, Faculty of Science, Utrecht University, 3584 CH Utrecht, The Netherlands.


Lateral organ distribution at the shoot apical meristem defines specific and robust phyllotaxis patterns that have intrigued biologists and mathematicians for centuries. In silico studies have revealed that this self-organizing process can be recapitulated by modeling the polar transport of the phytohormone auxin. Phyllotactic patterns change between species and developmental stages, but the processes behind these variations have remained unknown. Here we use regional complementation experiments to reveal that phyllotactic switches in Arabidopsis shoots can be mediated by PLETHORA-dependent control of local auxin biosynthesis.

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