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Published on November 10, 2006; 10.1104/pp.106.087494

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Received July 28, 2006
Accepted October 31, 2006

Association of Specific Expansins with Longitudinal and Lateral Expansion in Maize Leaves Is Maintained under Environmental, Genetic and Developmental Sources of Variation

Bertrand Muller *, Gildas Bourdais , Beat Reidy , Christelle Bencivenni , Agnès Massonneau , Pascal Condamine , Gaëlle Rolland , Geneviève Conéjéro , Peter Rogowsky , and François Tardieu

LEPSE, UMR 759 INRA-ENSAM, Montpellier, France
RDP, UMR 5667 CNRS-INRA-ENSL-UCBL, Lyon, France
Plateau d'Histocytologie et Imagerie Cellulaire Végétale, CIRAD, Montpellier, France

* Corresponding author; email: bertrand.muller{at}montpellier.inra.fr.

We aimed to evaluate whether changes in maize leaf expansion rate, in response to environmental stimuli or developmental gradients are mediated by common or specific expansins, a class of proteins known to enhance cell wall extensibility. Among the 33 maize expansin or putative expansin genes analyzed, 19 were preferentially expressed at some point of the leaf elongation zone and these expansins could be organized into three clusters related to cell division, maximum leaf expansion and cell wall differentiation. A further analysis of the spatial distribution of expression was carried out for 3 expansins in leaves displaying a large range of expansion rates due to a range of water deficits, genotypes, leaf developmental stages. With most sources of variation, the three genes showed similar changes in expression and consistent association with changes in leaf expansion. Moreover, our analysis also suggested preferential association of each expansin with elongation, widening or both of these processes. Finaly, using in situ hybridization, the expression of two of these genes was increased in load bearing tissues such as the epidermis and differentiating xylem cells. Together, these results suggest that some expansins may be preferentially related to elongation and widening after integrating several spatial, environmental, genetic and developmental cues.




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