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First published online August 25, 2005

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Reversed auxin transport jams development

During Arabidopsis embryonic development, the cotyledons form from precursors that do not derive from the shoot apical meristem, from which the other leaves form. The role of auxin and the genes involved in this process are unknown. Now, on p. 4063, Treml et al. report a novel Arabidopsis mutant, laterne, in which, unusually, cotyledons are specifically and precisely lost. This mutant carries mutations in PINOID, which helps localise the PIN1 auxin transport facilitator to the apical membrane of meristem epidermal cells, and in ENHANCER OF PINOID (ENP), a novel gene of unknown function. In laterne plants, the authors report, the normal apical localisation of PIN1 is reversed to basal, which is likely to cause apical cells in the embryo to repulse auxin coming from basal cells. Consequently, auxin, which is essential for organ formation, fails to accumulate in the mutant cotyledon primordia. Future studies should elucidate the exact role of ENP in auxin transport.

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Related articles in Development:

The gene ENHANCER OF PINOID controls cotyledon development in the Arabidopsis embryo

Birgit S. Treml, Sabine Winderl, Roman Radykewicz, Markus Herz, Günther Schweizer, Peter Hutzler, Erich Glawischnig, and Ramón A. Torres Ruiz
Development 2005 132: 4063-4074. [Abstract] [Full Text]  

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Related articles in Development Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Search for Related Content Social Bookmarking                         What's this?