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Only recently it was noticed that in addition to mineral salts, xylem sap contains organic nutrients and even proteins. Although these proteins might have important impact on the performance of above-ground organs, only a few of them have been identified so far and their physiological functions are still unclear.<\/jats:p>\n                     <\/jats:sec><jats:sec>\n                        <jats:title>Results<\/jats:title>\n                        <jats:p>We used root-pressure xylem exudate, collected from cut <jats:italic>Brassica napus<\/jats:italic> stems, to extract total proteins. These protein preparations were then separated by high-resolution two-dimensional gel electrophoresis (2-DE). After individual tryptic digests of the most abundant coomassie-stained protein spots, partial peptide sequence information was deduced from tandem mass spectrometric (MS\/MS) fragmentation spectra and subsequently used for protein identifications by database searches. This approach resulted in the identification of 69 proteins. These identifications include different proteins potentially involved in defence-related reactions and cell wall metabolism.<\/jats:p>\n                     <\/jats:sec><jats:sec>\n                        <jats:title>Conclusion<\/jats:title>\n                        <jats:p>This study provides a comprehensive overview of the most abundant proteins present in xylem sap of <jats:italic>Brassica napus<\/jats:italic>. A number of 69 proteins could be identified from which many previously were not known to be localized to this compartment in any other plant species. Since <jats:italic>Brassica napus<\/jats:italic>, a close relative of the fully sequenced model plant <jats:italic>Arabidopsis thaliana<\/jats:italic>, was used as the experimental system, our results provide a large number of candidate proteins for directed molecular and biochemical analyses of the physiological functions of the xylem under different environmental and developmental conditions. This approach will allow exploiting many of the already established functional genomic resources, like i.e. the large mutant collections, that are available for Arabidopsis.<\/jats:p>\n                     <\/jats:sec>","DOI":"10.1186\/1471-2229-5-11","type":"journal-article","created":{"date-parts":[[2005,6,21]],"date-time":"2005-06-21T18:13:54Z","timestamp":1119377634000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":89,"title":["Analysis of xylem sap proteins from Brassica napus"],"prefix":"10.1186","volume":"5","author":[{"given":"Julia","family":"Kehr","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anja","family":"Buhtz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patrick","family":"Giavalisco","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2005,6,21]]},"reference":[{"key":"56_CR1","doi-asserted-by":"publisher","first-page":"1779","DOI":"10.1104\/pp.103.030742","volume":"133","author":"A Oda","year":"2003","unstructured":"Oda A, Sakuta C, Masuda S, Mizoguchi T, Kamada H, Satoh S: Possible involvement of leaf gibberellins in the clock-controlled expression of XSP30, a gene encoding a xylem sap lectin, in cucumber roots. 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