KNAT1 and ERECTA regulate inflorescence architecture in Arabidopsis

The Plant Cell
Scott J DouglasC Daniel Riggs

Abstract

Plant architecture is dictated by morphogenetic factors that specify the number and symmetry of lateral organs as well as their positions relative to the primary axis. Mutants defective in the patterning of leaves and floral organs have provided new insights on the signaling pathways involved, but there is comparatively little information regarding aspects of the patterning of stems, which play a dominant role in architecture. To this end, we have characterized five alleles of the brevipedicellus mutant of Arabidopsis, which exhibits reduced internode and pedicel lengths, bends at nodes, and downward-oriented flowers and siliques. Bends in stems correlate with a loss of chlorenchyma tissue at the node adjacent to lateral organs and in the abaxial regions of pedicels. A stripe of achlorophyllous tissue extends basipetally from each node and is positioned over the vasculature that services the corresponding lateral organ. Map-based cloning and complementation studies revealed that a null mutation in the KNAT1 homeobox gene is responsible for these pleiotropic phenotypes. Our observation that wild-type Arabidopsis plants also downregulate chlorenchyma development adjacent to lateral organs leads us to propose that KNAT1 and ERECTA...Continue Reading

References

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Citations

May 3, 2013·Development Genes and Evolution·Angelika StammlerStefan Gleissberg
Dec 31, 2008·Plant Molecular Biology·Farzad HaerizadehPrem L Bhalla
Jan 21, 2004·Current Opinion in Plant Biology·Bruce Veit
Dec 24, 2002·Current Opinion in Plant Biology·Hannes Vogler, Cris Kuhlemeier
Jul 12, 2005·Nature·Josette MasleGraham D Farquhar
Oct 14, 2008·Proceedings of the National Academy of Sciences of the United States of America·Gang WuRandall A Kerstetter
Jul 16, 2010·Journal of Experimental Botany·María Jazmín Abraham-JuárezJune Simpson
Dec 6, 2011·Journal of Experimental Botany·Yang LiLin Xu
Jul 27, 2007·Plant & Cell Physiology·Nobutoshi YamaguchiYoshibumi Komeda
Oct 12, 2002·Plant Physiology·Olivier HamantVéronique Pautot
Nov 13, 2013·Plant Physiology·Nathalie BolducSarah Hake
Jun 27, 2006·The Plant Cell·Enric Belles-BoixVéronique Pautot
Oct 12, 2004·Annual Review of Cell and Developmental Biology·Sarah HakeJulio Ramirez
Nov 15, 2012·BMC Plant Biology·J Peter EtchellsHugh G Dickinson
Sep 29, 2011·PloS One·Mithu ChatterjeeKevin M Folta

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