McAbee, Jessica Messmer and Hill, Theresa A. and Skinner, Debra J. and Izhaki, Anat and Hauser, Bernard A. and Meister, Robert J. and Reddy, G. Venugopala and Meyerowitz, Elliot M. and Bowman, John L. and Gasser, Charles S. (2006) ABERRANT TESTA SHAPE encodes a KANADI family member, linking polarity determination to separation and growth of Arabidopsis ovule integuments. Plant Journal, 46 (3). pp. 522-531. ISSN 0960-7412 http://resolver.caltech.edu/CaltechAUTHORS:MCApj06
See Usage Policy.
Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:MCApj06
The Arabidopsis aberrant testa shape (ats) mutant produces a single integument instead of the two integuments seen in wild-type ovules. Cellular anatomy and patterns of marker gene expression indicate that the single integument results from congenital fusion of the two integuments of the wild type. Isolation of the ATS locus showed it to encode a member of the KANADI (KAN) family of putative transcription factors, previously referred to as KAN4. ATS was expressed at the border between the two integuments at the time of their initiation, with expression later confined to the abaxial layer of the inner integument. In an inner no outer (ino) mutant background, where an outer integument does not form, the ats mutation led to amorphous inner integument growth. The kan1 kan2 double mutant exhibits a similar amorphous growth of the outer integument without affecting inner integument growth. We hypothesize that ATS and KAN1/KAN2 play similar roles in the specification of polarity in the inner and outer integuments, respectively, that parallel the known roles of KAN proteins in promoting abaxial identity during leaf development. INO and other members of the YABBY gene family have been hypothesized to have similar parallel roles in outer integument and leaf development. Together, these two hypotheses lead us to propose a model for normal integument growth that also explains the described mutant phenotypes.
|Additional Information:||© 2006 The Authors. Journal compilation © 2006 Blackwell Publishing Ltd. Received 15 December 2005; revised 16 January 2006; accepted 19 January 2006. We thank Colin Leasure and James Evans for assistance with ATS mapping, Lynne Reuber for the ats-3 allele, the Arabidopsis Information Resource and the NSF Arabidopsis Biological Resource Center at Ohio State for mapping resources and plant lines, and members of the Gasser and Bowman laboratories for insightful discussions. This work was supported by grants from the US National Science Foundation (IBN-9983354 and IBN-0419531 to CSG, IOB-0332556 to JLB, and IOB-0211670 to EMM), BARD (IS-3328-02 to JLB) and a National Science Foundation Graduate Research Fellowship to JMM.|
|Subject Keywords:||reproductive development, seed, polarity, dormancy, organ fusion|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Lindsay Cleary|
|Deposited On:||13 Jun 2007|
|Last Modified:||26 Dec 2012 09:34|
Repository Staff Only: item control page