Sorefan, Karim ; Girin, Thomas ; Liljegren, Sarah J ; Ljung, Karin ; Robles, Pedro ; Galván-Ampudia, Carlos S ; Offringa, Remko ; Friml, JiríIST Austria ; Yanofsky, Martin F ; Østergaard, Lars
Local hormone maxima are essential for the development of multicellular structures and organs. For example, steroid hormones accumulate in specific cell types of the animal fetus to induce sexual differentiation and concentration peaks of the plant hormone auxin direct organ initiation and mediate tissue patterning. Here we provide an example of a regulated local hormone minimum required during organogenesis. Our results demonstrate that formation of a local auxin minimum is necessary for specification of the valve margin separation layer where Arabidopsis fruit opening takes place. Consequently, ectopic production of auxin, specifically in valve margin cells, leads to a complete loss of proper cell fate determination. The valve margin identity factor INDEHISCENT (IND) is responsible for forming the auxin minimum by coordinating auxin efflux in separation-layer cells. We propose that the simplicity of formation and maintenance make local hormone minima particularly well suited to specify a small number of cells such as the stripes at the valve margins.
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Sorefan K, Girin T, Liljegren S, et al. A regulated auxin minimum is required for seed dispersal in Arabidopsis. Nature. 2009;459(7246):583-586. doi:10.1038/nature07875
Sorefan, K., Girin, T., Liljegren, S., Ljung, K., Robles, P., Galván Ampudia, C., … Østergaard, L. (2009). A regulated auxin minimum is required for seed dispersal in Arabidopsis. Nature, 459(7246), 583–586. https://doi.org/10.1038/nature07875
Sorefan, Karim, Thomas Girin, Sarah Liljegren, Karin Ljung, Pedro Robles, Carlos Galván Ampudia, Remko Offringa, Jirí Friml, Martin Yanofsky, and Lars Østergaard. “A Regulated Auxin Minimum Is Required for Seed Dispersal in Arabidopsis.” Nature 459, no. 7246 (2009): 583–86. https://doi.org/10.1038/nature07875.
K. Sorefan et al., “A regulated auxin minimum is required for seed dispersal in Arabidopsis,” Nature, vol. 459, no. 7246, pp. 583–586, 2009.
Sorefan K, Girin T, Liljegren S, Ljung K, Robles P, Galván Ampudia C, Offringa R, Friml J, Yanofsky M, Østergaard L. 2009. A regulated auxin minimum is required for seed dispersal in Arabidopsis. Nature. 459(7246), 583–586.
Sorefan, Karim, et al. “A Regulated Auxin Minimum Is Required for Seed Dispersal in Arabidopsis.” Nature, vol. 459, no. 7246, Nature Publishing Group, 2009, pp. 583–86, doi:10.1038/nature07875.