Canadian Forest Service Publications
Detection and seasonal expression pattern of a pathogenesis-related protein (PR-10) in Douglas-fir (Pseudotsuga menziesii) tissues. 2000. Ekramoddoullah, A.K.M.; Yu, X; Sturrock, R.N.; Taylor, D.; Zamani, A. Physiologia Plantarum 110: 240-247.
Issued by: Pacific Forestry Centre
Catalog ID: 5500
Availability: Order paper copy (free)
Previously, a PR-10 protein Pin m III was described in western white pine. In this study, primers based on cDNA of Pin m III were utilized to obtain the genomic sequence of a Pin m III homologue - Pse m I - in Douglas-fir. A comparative analysis of a deduced amino acid sequence of Pin m III and Pse m I genes indicated about 80% similarity between the two protein sequences, and a consensus 20 amino-acid sequence located around the p-loop sequence was used to synthesize a peptide of 20 amino acids. An antibody to this synthetic peptide was able to detect the Pse m I protein in Douglas-fir. The anti-Pse m I antibody was used in a western immunoblot to monitor seasonal variation of the Pse m I in Douglas-fir needles and its level was shown to increase with overwintering of Douglas-fir seedlings. However, unlike the Pin m III, there is no indication that the Pse m I is associated with frost hardiness. Analysis of infected Douglas-fir roots showed a possible trend to up-regulation of Pse m I by pathogens such as the laminated root rot fungus, Phellinus weirii. The expression of Pse m I protein in Douglas-fir seedlings is very low compared to the expression of Pin m III protein in western white pine seedlings. In addition, a light-harvesting complex I protein, PSI-F was identified in Douglas-fir by N-terminal amino acid sequencing.