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Abstract Detail


Genetics Section

Hay, Angela [1], Krieger, Jonathan D. [2], Galinha, Carla [1], MacLeod, Norman [3], Tsiantis, Miltos [4].

KNOX-dependent aspects of asymmetric leaves1 shape space.

Leaf development in higher plants requires the specification of leaf initials at the flanks of a pluripotent structure termed the shoot apical meristem. In Arabidopsis, this process is facilitated by negative interactions between class I KNOTTED1-like homeobox (KNOX) and ASYMMETRIC LEAVES1 (AS1) transcription factors, such that KNOX proteins are confined to the meristem and AS1 to leaf initials. Mutations in AS1 result in ectopic expression of the KNOX genes BREVIPEDICELLUS (BP), KNOTTED1-like in Arabidopsis thalina2 (KNAT2) and KNAT6 in the leaf. This ectopic KNOX expression in the AS1 mutant leaf correlates with an aberrant leaf shape. However, previous work has suggested that the as1 mutant leaf shape is not due to ectopic KNOX expression in the leaf.
Assessment of morphological affinities has been hampered by use of qualitative and simple linear measurements. Here we use coordinate-point eigenshape analysis to investigate whether any aspects of AS1 leaf shape are KNOX-dependent. This approach allows us to quantify subtle differences in leaf form with variance-optimized, orthogonal shape descriptors. By analysing a gradient of mutant combinations we establish the relative contribution of each KNOX gene to AS1 leaf shape.


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1 - Oxford University, Plant Sciences Dept, South Parks Rd, Oxford, OX1 3RB, United Kingdom
2 - the Natural History Museum, Palaeontology, Cromwell Road, London, SW7 5BD, United Kingdom
3 - the Natural History Museum, Dept of Palaeontology, Cromwell Road, London, SW7 5BD, United Kingdom
4 - University of Oxford, Department of Plant Sciences, South Parks Road, Oxford, Oxfordshire, OX1 3RB, United Kingdom

Keywords:
Leaf development
Arabidopsis
Geometric morphometrics
Eigenshape analysis
Asymmetric leaves1
KNOTTED1-like homeobox.

Presentation Type: Oral Paper:Papers for Sections
Session: 5
Location: 182/I K Barber
Date: Monday, July 28th, 2008
Time: 11:45 AM
Number: 5015
Abstract ID:759


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