Localized Upregulation of a New Expansin Gene Predicts the Site of Leaf Formation in the Tomato Meristem

Reinhardt, Didier; Wittwer, Franz; Mandel, Therese; Kuhlemeier, Cris (1998). Localized Upregulation of a New Expansin Gene Predicts the Site of Leaf Formation in the Tomato Meristem. The Plant Cell, 10(9), pp. 1427-1437. American Society of Plant Biologists 10.1105/tpc.10.9.1427

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Expansins are extracellular proteins that increase plant cell wall extensibility in vitro and are thought to be involved in cell expansion. We showed in a previous study that administration of an exogenous expansin protein can trigger the initiation of leaflike structures on the shoot apical meristem of tomato. Here, we studied the expression patterns of two tomato expansin genes, LeExp2 and LeExp18. LeExp2 is preferentially expressed in expanding tissues, whereas LeExp18 is expressed preferentially in tissues with meristematic activity. In situ hybridization experiments showed that LeExp18 expression is elevated in a group of cells, called I1, which is the site of incipient leaf primordium initiation. Thus, LeExp18 expression is a molecular marker for leaf initiation, predicting the site of primordium formation at a time before histological changes can be detected. We propose a model for the regulation of phyllotaxis that postulates a crucial role for expansin in leaf primordium initiation.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Plant Development

UniBE Contributor:

Reinhardt, Didier; Mandel, Therese and Kuhlemeier, Cris

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

1040-4651

Publisher:

American Society of Plant Biologists

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

02 Jun 2016 09:58

Last Modified:

31 Mar 2017 11:44

Publisher DOI:

10.1105/tpc.10.9.1427

BORIS DOI:

10.7892/boris.82231

URI:

https://boris.unibe.ch/id/eprint/82231

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