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JXB Advance Access originally published online on June 18, 2004
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Journal of Experimental Botany, Vol. 55, No. 402, pp. 1529-1539, July 2004
Journal of Experimental Botany, Vol. 55, No. 402, © Society for Experimental Biology 2004; all rights reserved

RESEARCH PAPER

The rotunda2 mutants identify a role for the LEUNIG gene in vegetative leaf morphogenesis

Gerda Cnops1, Sara Jover-Gil2, Janny L. Peters1 *, Pia Neyt1, Sabine De Block1, Pedro Robles2, María R. Ponce2, Tom Gerats1 *, José L. Micol2 and Mieke Van Lijsebettens1,{dagger}

1Department of Plant Systems Biology, Flanders Interuniversity Institute for Biotechnology, Ghent University, Technologiepark 927, B-9052 Ghent, Belgium
2División de Genética and Instituto de Bioingeniería, Universidad Miguel Hernández, Campus de Elche, E-03202 Elche (Alicante), Spain

{dagger} To whom correspondence should be addressed. Fax: +32 9 33 13809. E-mail: mieke.vanlijsebettens{at}psb.ugent.be

Leaf development in Arabidopsis thaliana is considered to be a two-step process. In the first step, a leaf primordium is formed that involves a switch from indeterminate to leaf developmental fate in the shoot apical meristem cells. The second step, known as leaf morphogenesis, consists of post-initiation developmental events such as patterned cell proliferation, cell expansion, and cell differentiation. The results are presented of the molecular and genetic analyses of the rotunda2 (ron2) mutants of Arabidopsis, which were isolated based on their wide and serrated vegetative leaf lamina. The RON2 gene was positionally cloned and was identical to LEUNIG (LUG); it encodes a transcriptional co-repressor that has been described to affect flower development. Morphological and histological analyses of expanded leaves indicated that RON2 (LUG) acts at later stages of leaf development by restricting cell expansion during leaf growth. Real-time reverse-transcription polymerase chain reaction was used to quantify the expression of KNOX, WUSCHEL, YABBY3, LEAFY, ASYMMETRIC LEAVES, and GIBBERELLIN OXIDASE genes in expanding and fully expanded rosette leaf laminas of the wild type and ron2 and lug mutants. SHOOTMERISTEMLESS was expressed in wild-type leaves and down-regulated in the mutants. The results indicate that RON2 (LUG) has a function in later stages of leaf development.

Key words: Cell division, cell expansion, leaf development, real time reverse-transcriptase PCR


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