Abstract
Six partial PCR fragments that encode aquaporin homologues in the halophyte sea asterAster tripolium were cloned using genomic DNA and cDNA as templates. The deduced amino acid sequences were highly similar to those of other major intrinsic proteins (MIPs) in plants. The expression patterns of sea astermip genes in leaves and suspension-cultured cells during a 24-hr NaCL stress period were studied with PCR samip (sea aster major intrinsic protein) fragments. Three samip (A-C) fragments were obtained by PCR with genomic DNA as templates, and 3 samip (D-F) fragments were obtained by RT-PCR. Among the 6 genes, expression ofSamip A, B, andC was significantly inducible by salt stress. The level ofSamip A, B andC mRNAs was dependent on NaCL concentration in both whole plants and cultured cells. However, no significant accumulation ofSamip transcripts was observed in salt-adapted cells. These observations suggest thatSamip A, B andC genes play an important role in the early salt-adaptable stage in sea asters.
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Abbreviations
- MIP:
-
major intrinsic protein
- P-5-C:
-
Δ1-pyrroline-5-carboxylase
- RT-PCR:
-
reverse transcription PCR
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The nucleotide sequences of samip A, B, C, D, E and F cDNAs reported in this paper have been submitted to EMBL, Gen-Bank and DDBJ with accession numbers AB012267, AB012268, AB012269, AB012270, AB012271 and AB012272, respectively.
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Uno, Y., Urao, T., Yamaguchi-Shinozaki, K. et al. Early salt-stress effects on expression of genes for aquaporin homologues in the halophyte sea aster (Aster tripolium L.). J. Plant Res. 111, 411–419 (1998). https://doi.org/10.1007/BF02507806
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DOI: https://doi.org/10.1007/BF02507806