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Development, Vol 125, Issue 14 2555-2563, Copyright © 1998 by Company of Biologists
JOURNAL ARTICLES |
K Schneitz, SC Baker, CS Gasser and A Redweik
Institute of Plant Biology, University of Zurich, Zollikerstrasse 107, CH-8008 Zurich, Switzerland. schneitz@botinst.unizh.ch
Our understanding of the molecular mechanisms that regulate and integrate the temporal and spatial control of cell proliferation during organ ontogenesis, particularly of floral organs, continues to be primitive. The ovule, the progenitor of the seed, of Arabidopsis thaliana has been used to develop an effective model system for the analysis of plant organogenesis. A typical feature of a generalized ovule is the linear arrangement of at least three distinct elements, the funiculus, chalaza and nucellus, along a proximal-distal axis. This pattern is supposed to be established during the early proliferative phase of ovule development. We provide genetic evidence that the young ovule primordium indeed is a composite structure. Two genes, HUELLENLOS and AINTEGUMENTA have overlapping functions in the ovule and differentially control the formation of the central and proximal elements of the primordium. The results indicate that proximal-distal pattern formation in the Arabidopsis ovule takes place in a sequential fashion, starting from the distal end. Furthermore, we show that HUELLENLOS also regulates the initiation and/or maintenance of integument and embryo sac ontogenesis and interestingly prevents inappropriate cell death in the young ovule.
This article has been cited by other articles:
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 D. J. Skinner, T. A. Hill, and C. S. Gasser Regulation of Ovule Development PLANT CELL, June 1, 2004; 16(suppl_1): S32 - S45. [Full Text] [PDF]
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M. L. Gifford, S. Dean, and G. C. Ingram The Arabidopsis ACR4 gene plays a role in cell layer organisation during ovule integument and sepal margin development Development, September 15, 2003; 130(18): 4249 - 4258. [Abstract] [Full Text] [PDF]
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S. Balasubramanian and K. Schneitz NOZZLE links proximal-distal and adaxial-abaxial pattern formation during ovule development in Arabidopsis thaliana Development, March 11, 2003; 129(18): 4291 - 4300. [Abstract] [Full Text] [PDF]
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D. J. Skinner, S. C. Baker, R. J. Meister, J. Broadhvest, K. Schneitz, and C. S. Gasser The Arabidopsis HUELLENLOS Gene, Which Is Essential for Normal Ovule Development, Encodes a Mitochondrial Ribosomal Protein PLANT CELL, December 1, 2001; 13(12): 2719 - 2730. [Abstract] [Full Text] [PDF]
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B. A. Krizek, V. Prost, and A. Macias AINTEGUMENTA Promotes Petal Identity and Acts as a Negative Regulator of AGAMOUS PLANT CELL, August 1, 2000; 12(8): 1357 - 1366. [Abstract] [Full Text]
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J. Broadhvest, S. C. Baker, and C. S. Gasser SHORT INTEGUMENTS 2 Promotes Growth During Arabidopsis Reproductive Development Genetics, June 1, 2000; 155(2): 899 - 907. [Abstract] [Full Text]
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S Balasubramanian and K Schneitz NOZZLE regulates proximal-distal pattern formation, cell proliferation and early sporogenesis during ovule development in Arabidopsis thaliana Development, January 10, 2000; 127(19): 4227 - 4238. [Abstract] [PDF]
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U. Schiefthaler, S. Balasubramanian, P. Sieber, D. Chevalier, E. Wisman, and K. Schneitz Molecular analysis of NOZZLE, a gene involved in pattern formation and early sporogenesis during sex organ development in Arabidopsis thaliana PNAS, September 28, 1999; 96(20): 11664 - 11669. [Abstract] [Full Text] [PDF]
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