Dissecting the response to dehydration and salt (NaCl) in the resurrection plant Craterostigma plantagineum

Plant, Cell and Environment - Tập 26 Số 8 - Trang 1307-1315 - 2003
Claudia Smith‐Espinoza1, Andreas Richter2, F. Salamini3, Dorothea Bartels3
1Max‐Planck‐Institut für Züchtungsforschung, Carl‐von‐Linné Weg 10, D‐50829, Köln, Germany and
2Institute of Ecology, University of Vienna, Althanstrasse 14, A‐1090 Vienna, Austria
3Dept. of Plant Breeding and Yield Physiology (Francesco Salamini), MPI for Plant Breeding Research, Max Planck Society

Tóm tắt

ABSTRACTAlthough desiccation tolerant, the resurrection plant Craterostigma plantagineum is sensitive to relatively low levels of sodium chloride. Exposure to sodium chloride, but not dehydration, led to accumulation of sodium ions in leaves and roots and caused irreversible wilting. The effects of salt and dehydration on transcript accumulation patterns were studied by using selected cDNA clones that were related to water stress. Most of the clones represented genes that were up‐regulated in response to both treatments. Among the transcripts specifically up‐regulated by dehydration were RNAs encoding transcripts with homology to aquaporins. Expression analysis revealed dehydration‐specific profiles of late embryogenesis abundant (LEA) genes, which differed from the patterns observed for the same genes under sodium chloride stress. The interconversion of octulose and sucrose, which is characteristic for the desiccation/rehydration cycle in C. plantagineum leaves, was not activated by sodium chloride. The present results suggest that dehydration‐specific responses involve the synchronized expression of specific genes and the presence of a determined concentration of sucrose. These dehydration responses were not detected in response to sodium chloride treatment.

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Plant, Cell and Environment

Tập 26 Số 8

1307-1315

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