Abstract
The resurrection plant Craterostigma plantagineum Hochst. is used as an experimental system to investigate desiccation tolerance in higher plants. A search for genes activated during early stages of dehydration identified the gene CpEdi-9, which is expressed in mature seeds and in response to dehydration in the phloem cells of vascular tissues of leaves. Elements for the tissue-specific expression pattern reside in the isolated promoter of the CpEdi-9 gene, as shown through the analysis of transgenic plants. The CpEdi-9 promoter could be a suitable tool for expressing genes in the vascular system of dehydrated plants. CpEdi-9 encodes a small (10 kDa) hydrophilic protein, which does not have significant sequence homologies to known genes. The predicted protein CpEDI-9 shares some physicochemical features with LEA proteins from plants and a nematode. Based on the unique expression pattern and on the nucleotide sequence we propose that CpEdi-9 defines a new class of hydrophilic proteins that are supposed to contribute to cellular protection during dehydration. This group of proteins may have evolved because desiccation tolerance requires the abundant expression of protective proteins during early stages of dehydration in all tissues.
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Abbreviations
- ABA :
-
Abscisic acid
- ABRE :
-
ABA-responsive element
- Edi :
-
Early dehydration induced
- GUS :
-
Glucuronidase
- LEA :
-
Late embryogenesis abundant
- MU :
-
Methylumbelliferone
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Acknowledgments
We thank F. Salamini for advice during the work and critically reading the manuscript, B. Eilts for technical assistance, S. Berger for help with preparing the manuscript and C.J. Smith-Espinoza for performing the C. plantagineum salt treatments. M.-J.R. was supported by a postdoctoral fellowship from the Spanish Ministry of Science and Technology and a research contract from the EU Biotech Programme (BIO-CT98-5006).
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This article is dedicated to Prof. Dr. Francesco Salamini on the occasion of his 65th birthday and his departure from the Max Planck Institute in Köln
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Rodrigo, M.J., Bockel, C., Blervacq, AS. et al. The novel gene CpEdi-9 from the resurrection plant C. plantagineum encodes a hydrophilic protein and is expressed in mature seeds as well as in response to dehydration in leaf phloem tissues. Planta 219, 579–589 (2004). https://doi.org/10.1007/s00425-004-1264-z
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DOI: https://doi.org/10.1007/s00425-004-1264-z