genomic-transformation-of-the-picoeukaryote-ostreococcus-tauri

Genomic Transformation of the Picoeukaryote <em>Ostreococcus tauri</em>

Common problems hindering rapid progress in Plant Sciences include cellular, tissue and whole organism complexity, and notably the high level of genomic ...

University of Edinburgh 

Re-orientation of Arabidopsis seedlings induces a rapid, asymmetric release of the growth regulator auxin from gravity-sensing columella cells at the root apex. The resulting lateral auxin gradient is hypothesized to drive differential cell expansion in elongation-zone tissues. We mapped those root tissues that function to transport or respond to auxin during a gravitropic response. Targeted expression of the auxin influx facilitator AUX1 demonstrated that root gravitropism requires auxin to be transported via the lateral root cap to all elongating epidermal cells. A three-dimensional model of the root elongation zone predicted that AUX1 causes the majority of auxin to accumulate in the epidermis. Selectively disrupting the auxin responsiveness of expanding epidermal cells by expressing a mutant form of the AUX/IAA17 protein, axr3-1, abolished root gravitropism. We conclude that gravitropic curvature in Arabidopsis roots is primarily driven by the differential expansion of epidermal cells in response to an influx-carrier-dependent auxin gradient.

Article	Year
Development (Cambridge, England)\| PubMed ID: 14534134	2003
Root gravitropism requires lateral root cap and epidermal cells for transport and response to a mobile auxin signal. Nature cell biology\| PubMed ID: 16244669	2005
Proceedings of the National Academy of Sciences of the United States of America\| PubMed ID: 18003921	2007
Nature cell biology\| PubMed ID: 19079245	2009
Molecular systems biology\| PubMed ID: 20865009	2010
Molecular systems biology\| PubMed ID: 21045818	2010
Current biology : CB\| PubMed ID: 21236675	2011

Kirsten Knox

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