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JXB Advance Access originally published online on September 25, 2003
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Journal of Experimental Botany, Vol. 54, No. 392, pp. 2553-2562, November 1, 2003
© 2003 Oxford University Press

Proline induces the expression of salt-stress-responsive proteins and may improve the adaptation of Pancratium maritimum L. to salt-stress

Received 27 March 2003; Accepted 16 July 2003

Abdel Hamid A. Khedr1, Mohammad A. Abbas2, Amal A. Abdel Wahid2, W. Paul Quick3 and Gaber M. Abogadallah*,1

1 Department of Botany, Faculty of Science at New Damietta, New Damietta 3417, Egypt
2 Botany Department, Faculty of Science, Mansoura University, Egypt
3 Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK

* To whom correspondence should be addressed. Fax: +20 57 403868. E-mail: gabogadallah{at}mans.edu.eg

Proline is an important component of salt-stress responses of plants. In this study the role of proline as part of salt-stress signalling in the desert plant Pancratium maritimum L. was examined. The data showed that salt-stress brought about a reduction of the growth and protein content, particularly at 300 mM NaCl, that was significantly increased by exogenous proline. In the leaves, salt-stress up-regulated ubiquitin, a small protein targeting damaged proteins for degradation via the proteasome, up to 5-fold as detected by western blotting. This change was also affected by proline even in non-stressed leaves. However, salt-stress resulted in a decrease in the amount of ubiquitin-conjugates, particularly in the roots, and this effect was reversed by exogenous proline. Severe salt-stress resulted in an inhibition of the antioxidative enzymes catalase and peroxidase as revealed by spectrophotometric assays and activity gels, but the activity of these enzymes was also maintained significantly higher in the presence of proline. Salt-stress also up-regulated several dehydrin proteins, analysed by western blotting, even in non-stressed plants. It is concluded that proline improves the salt-tolerance of Pancratium maritimum L. by protecting the protein turnover machinery against stress-damage and up-regulating stress protective proteins.

Key words: Growth, Pancratium maritimum L., proline, salt-responsive genes.


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