ISSN:
1399-3054
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1034/j.1399-3054.2000.110214.x
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