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Xylem sap protein composition is conserved among different plant species

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Abstract

Xylem sap from broccoli (Brassica oleracea L. cv. Calabrais), rape (Brassica napus L. cv. Drakkar), pumpkin (Cucurbita maxima Duch. cv. gelber Zentner) and cucumber (Cucumis sativus L. cv. Hoffmanns Giganta) was collected by root pressure exudation from the surface of cut stems of healthy, adult plants. Total protein concentrations were in the range of 100 μg ml−1. One-dimensional gel electrophoresis (SDS–PAGE) resulted in 10–20 visible protein bands in a molecular mass range from 10 to 100 kDa. The main bands were cut out, digested with trypsin, and analysed using tandem mass spectrometry. Fifty bands resulted in amino acid sequence information that was used to perform database similarity searches. Sequences from 30 bands showed high homology to proteins present in databases. Among them, we found mostly peroxidases, but could also identify the lectin-like xylem protein XSP30, a glycine-rich protein, serine proteases, an aspartyl protease family protein, chitinases, and a lipid transfer protein-like polypeptide. Sequence analysis predicted apoplastic secretion signals for all database entries similar to the partial xylem protein sequences. This and the lack of cross-reactivity with phloem protein-specific antibodies suggest that the proteins really originate from the xylem and do not result from phloem contamination. Most of the highly similar proteins probably function in repair and defence reactions. Some of the most abundant proteins (peroxidases, chitinases, serine proteases) were present in xylem exudate of all species analysed, often in more than one band. This indicates an important basic role of these proteins in maintaining xylem function.

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Abbreviations

CHT:

Chitinase

1D:

One-dimensional

GRP:

Glycine-rich protein

SP:

Serine protease

SSP:

Subtilisin-like serine protease

POX:

Peroxidase

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Acknowledgement

This work was supported by the Deutsche Forschungsgemeinschaft (SFB 429, project C7).

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Authors and Affiliations

  1. Max-Planck-Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476, Golm, Germany

    Anja Buhtz, Anna Kolasa, Kathleen Arlt, Christina Walz & Julia Kehr

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  1. Anja Buhtz
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  2. Anna Kolasa
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  3. Kathleen Arlt
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  4. Christina Walz
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  5. Julia Kehr
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Correspondence to Julia Kehr.

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Buhtz, A., Kolasa, A., Arlt, K. et al. Xylem sap protein composition is conserved among different plant species. Planta 219, 610–618 (2004). https://doi.org/10.1007/s00425-004-1259-9

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