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JXB Advance Access originally published online on November 28, 2003
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Journal of Experimental Botany, Vol. 55, No. 394, pp. 99-109, January 1, 2004
© 2004 Oxford University Press

Regulation of Growth, Development and Whole Organism Physiology

The histone-like protein H1-S and the response of tomato leaves to water deficit

Received 11 April 2003; Accepted 6 August 2003

Gabriella S. Scippa1,*, Michela Di Michele1, Elisabetta Onelli2, Giuseppe Patrignani2, Donato Chiatante3 and Elizabeth A. Bray4

1 Dipartimento di Scienze e Tecnologie per l’Ambiente ed il Territorio, Università degli Studi del Molise, via Mazzini 8, 86170 Isernia, Italia
2 Dipartimento di Biologia, Università degli Studi di Milano, via Celoria 26, 20133 Milano, Italia
3 Dipartimento di Scienze Chimiche, Fisiche e Matematiche ,Dipartimento di Biologia Strutturale e Funzionale, Università degli Studi dell’Insubria, via Valleggio 11, 22100 Como, Italia
4 Department of Botany and Plant Sciences, University of California, Riverside, CA 92521, USA

* To whom correspondence should be addressed. Fax: +39 0865 411283. E-mail: scippa{at}unimol.it

Linker histone protein variants are expressed in different tissues, at various developmental stages or induced by specific environmental conditions in many plant species. In most cases, the function of these proteins remains unknown. In the work presented here an antisense strategy has been used to study the function of the drought-induced linker histone, H1-S of tomato. Three independent H1-S antisense tomato mutants, selected for their inability to accumulate H1-S in response to water stress, were studied. These mutants have been characterized at the physiological and morphological levels. Histone H1-S antisense transgenic plants developed normally indicating that H1-S does not play an important role in the basal functions of tomato development. No differences were detected in chromatin organization, excluding a structural role for H1-S in chromatin organization. However, differences between the wild-type and antisense plants were observed in leaf anatomy and physiological activities. This analysis indicates that H1-S has more than one function, at different times, in controlling plant water status, highlighting the complexity of the water stress response.

Key words: Antisense, chromatin, H1 histone, relative water content, stomatal conductance, tomato, water-deficit stress.


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