Plant and Cell Physiology, 1999, Vol. 40, No. 4 378-387
© 1999
Sequence analysis of Expressed Sequence Tags from an ABA-Treated cDNA Library Identifies Stress Response Genes in the Moss Physcomitrella patens
Centre for Plant Sciences, Leeds Institute for Plant Biotechnology and Agriculture (LIBA), School of Biology, University of Leeds Leeds, LS2 9JT, U.K.
Partial cDNA sequencing was used to obtain 169 expressed sequence tags (ESTs) in the moss, Physcomitrella patens. The source of ESTs was a random cDNA library constructed from 7 day-old protonemata following treatment with 104 M abscisic acid (ABA). Analysis of the ESTs identified 69% with homology to known sequences, 61% of which had significant homology to sequences of plant origin. More importantly, at least 11 ESTs had significant similarities to genes which are implicated in plant stress-responses, including responses which may involve ABA. These included a cDNA associated with desiccation tolerance, two heat shock protein genes, one cold acclimation protein cDNA and five others that may be involved in either oxidative or chemical stress or both, i.e., Zn/Cu-superoxide dismutase, NADPH protochlorophyllide oxidoreductase (PorB), selenium binding protein, glutathione peroxidase and glutathione S transferase. Analysis of codon usage between P. patens and seed plants indicated that although mosses and higher plants are to a large extent similar, minor variations also exist that may represent the distinctiveness of each group.
1 Present address: International Institute of Tropical Agriculture, c/o LW Lambourn & Co. LTD, Carolyn House, 26 Dingwall Road, Croydon CR9 3EE, U.K.
(Received September 10, 1998; Accepted January 30, 1999)
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