15. The Regulation of Dorsiventral Symmetry in Plants
239
be involved in the establishment of ab-adaxiality and blade formation. Two identified players appear to be PRAN (a MYB-domain transcription factor) and KNOTTED1-like proteins (homeodomain transcription factors). Other key genes have yet
to be identified. Information gained from a survey of diversity in plant form, including such alternate morphologies as unifacialleaves and flattened stems, will be
a great future resource in establishing the links between gene expression and phenotype.
Acknowledgments
The authors thank Prof. Donald R. Kaplan for comments on an earlier draft of this
manuscript, Tom Goliber and Sharon Kessler for many helpful suggestions, and
Dr. R. K. Eberwein, Vienna, for the use of Fig. 3.
References
Baum H (1952) Normale und inverse Unifazialitat an den Laubblattern von Codiaewn
variegatum. Oester Bot Zh 95:421-451
Beck CB (1976) Current status of the Progymnospernl0psida. Rev Palaeobot Palynol 21:523
Beck CB (1981) Archaeopteris and its role in vascular plant evolution. In: Niklas KJ (Ed)
Paleobotany, paleoecology, and evolution. vol. 1. Praeger, New York, pp 193-230
Bohmert K, Camus I, Bellini C, Bouchez D, Caboche M, Benning C (1998) AGOl defines a
novel locus of Arabidopsis controlling leaf development. EMBO J 17: 170-180
Bower FO (1935) Primitive land plants. Macmillan, London
Chen J-J, Janssen B~J, Williams A, Sinha N (1997) A gene fusion at a homeobox locus:
alteration in leaf shape and implications for morphological evolution. Plant Cell 9: 12891304
Coen ES, Nugent JM (1994) Evolution of tlowers and inflorescences. Development (Suppl.
1994):107-116
Cohen B, McGuffin M, Pfeifle C, Segal D, Cohen S (1992) Apterous: a gene required for
imaginal disk development in Drosophila encodes a member of the LIM family of
developmental regulatory proteins. Genes Dev 6:715-729
Cooney-Sovetts C, Sattler R (1986) Phylloc\ade development in the Asparagaceae: an example of homeosis. Bot J Linnean Soc 94:327-372
Cutter EG (1958) Studies on morphogenesis in Nymphaeaceae. Phytomorphology 8:74-95
Eberwein RK (1995) Bau und Ontogenese unkonventioneller Blatter des Typs 'unifaziale
Phyllome' und deren Beitrag zur Theorie des Spermatophytenblattes. Diss. RWTH
Aachen
Fleming A, McQueen-Mason S, Mandel T, Kuhlemeier C (1997) Induction of leaf primordia by the cell wall protein expansin. Science 276:1415-1418
Florin R (1950) Upper Carboniferous and Lower Permian conifers. Bot Rev 16:258-282
Florin R (1951) Evolution in cordaites and conifers. Acta Horti Bergiani 15:285-388
Gifford EM, Foster AS (1989) Morphology and evolution of vascular plants. WH Freeman,
New York
239
be involved in the establishment of ab-adaxiality and blade formation. Two identified players appear to be PRAN (a MYB-domain transcription factor) and KNOTTED1-like proteins (homeodomain transcription factors). Other key genes have yet
to be identified. Information gained from a survey of diversity in plant form, including such alternate morphologies as unifacialleaves and flattened stems, will be
a great future resource in establishing the links between gene expression and phenotype.
Acknowledgments
The authors thank Prof. Donald R. Kaplan for comments on an earlier draft of this
manuscript, Tom Goliber and Sharon Kessler for many helpful suggestions, and
Dr. R. K. Eberwein, Vienna, for the use of Fig. 3.
References
Baum H (1952) Normale und inverse Unifazialitat an den Laubblattern von Codiaewn
variegatum. Oester Bot Zh 95:421-451
Beck CB (1976) Current status of the Progymnospernl0psida. Rev Palaeobot Palynol 21:523
Beck CB (1981) Archaeopteris and its role in vascular plant evolution. In: Niklas KJ (Ed)
Paleobotany, paleoecology, and evolution. vol. 1. Praeger, New York, pp 193-230
Bohmert K, Camus I, Bellini C, Bouchez D, Caboche M, Benning C (1998) AGOl defines a
novel locus of Arabidopsis controlling leaf development. EMBO J 17: 170-180
Bower FO (1935) Primitive land plants. Macmillan, London
Chen J-J, Janssen B~J, Williams A, Sinha N (1997) A gene fusion at a homeobox locus:
alteration in leaf shape and implications for morphological evolution. Plant Cell 9: 12891304
Coen ES, Nugent JM (1994) Evolution of tlowers and inflorescences. Development (Suppl.
1994):107-116
Cohen B, McGuffin M, Pfeifle C, Segal D, Cohen S (1992) Apterous: a gene required for
imaginal disk development in Drosophila encodes a member of the LIM family of
developmental regulatory proteins. Genes Dev 6:715-729
Cooney-Sovetts C, Sattler R (1986) Phylloc\ade development in the Asparagaceae: an example of homeosis. Bot J Linnean Soc 94:327-372
Cutter EG (1958) Studies on morphogenesis in Nymphaeaceae. Phytomorphology 8:74-95
Eberwein RK (1995) Bau und Ontogenese unkonventioneller Blatter des Typs 'unifaziale
Phyllome' und deren Beitrag zur Theorie des Spermatophytenblattes. Diss. RWTH
Aachen
Fleming A, McQueen-Mason S, Mandel T, Kuhlemeier C (1997) Induction of leaf primordia by the cell wall protein expansin. Science 276:1415-1418
Florin R (1950) Upper Carboniferous and Lower Permian conifers. Bot Rev 16:258-282
Florin R (1951) Evolution in cordaites and conifers. Acta Horti Bergiani 15:285-388
Gifford EM, Foster AS (1989) Morphology and evolution of vascular plants. WH Freeman,
New York