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Plant and Cell Physiology Advance Access originally published online on March 7, 2008
Plant and Cell Physiology 2008 49(4):653-663; doi:10.1093/pcp/pcn040
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© The Author 2008. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Constitutive Components and Induced Gene Expression are Involved in the Desiccation Tolerance of Selaginella tamariscina

Mao-Sen Liu1, Ching-Te Chien2 and Tsan-Piao Lin1,*

1Institute of Plant Biology, National Taiwan University, 1 Roosevelt Road, Section 4, Taipei 106, Taiwan
2Division of Silviculture, Taiwan Forestry Research Institute, 53 Nan-Hai Road, Taipei 100, Taiwan

*Corresponding author: E-mail, tpl{at}ntu.edu.tw; Fax, +886-2-23689564.


  Abstract

Selaginella tamariscina, one of the most primitive vascular plants, can remain alive in a desiccated state and resurrect when water becomes available. To evaluate the nature of desiccation tolerance in this plant, we compared the composition of soluble sugars and saturation ratios of phospholipids (PLs) between hydrated and desiccated tissues of S. tamariscina using gas chromatography. In this study, differences in gene expression and ABA contents were also analyzed during dehydration. The results revealed that trehalose (at >130 mg g–1 DW) was the major soluble sugar, and low saturated fatty acid content in PLs (0.31) was maintained in both hydrated and desiccated tissues. In addition, the ABA content of S. tamariscina increased 3-fold, and genes involved in ABA signaling and cellular protection were up-regulated while photosystem-related genes were down-regulated during dehydration. The biochemical and molecular findings suggest that both constitutive and inducible protective molecules contribute to desiccation tolerance of S. tamariscina.

Keywords: ABA - Desiccation tolerance - Phospholipids - Selaginella - Trehalose

Abbreviations: ATS1, ARABIDOPSIS THALIANA SEED GENE 1; ChlBP, chlorophyll a/b-binding protein; ELIP, early light-inducible protein; EST, expressed sequence tag; FAD-OR, FAD-dependent oxidoreductase; GC, gas chromatography; LEA, late embryonic abundant; LRR, leucine-rich repeat; OST1, OPEN STOMATA 1; PL, phospholipid; PSIID1, PSII protein D1; Tg, glass transition temperature; Tm, phase transition temperature; ZF, zinc-finger.

(Received January 8, 2008; Accepted March 1, 2008)
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