An inland and a coastal population of the Mediterranean xero-halophyte species Atriplex halimus L. differ in their ability to accumulate proline and glycinebetaine in response to salinity and water stress
Identifieur interne : 001351 ( Main/Exploration ); précédent : 001350; suivant : 001352An inland and a coastal population of the Mediterranean xero-halophyte species Atriplex halimus L. differ in their ability to accumulate proline and glycinebetaine in response to salinity and water stress
Auteurs : Abir Ben Hassine [Tunisie] ; Michel Edmond Ghanem [Belgique] ; Sadok Bouzid [Tunisie] ; Stanley Lutts [Belgique]Source :
- Journal of Experimental Botany [ 0022-0957 ] ; 2008-04-02.
Abstract
Soil salinity and drought compromise water uptake and lead to osmotic adjustment in xero-halophyte plant species. These important environmental constraints may also have specific effects on plant physiology. Stress-induced accumulation of osmocompatible solutes was analysed in two Tunisian populations of the Mediteranean shrub Atriplex halimus L.plants originating from a salt-affected coastal site (Monastir) or from a non-saline semi-arid area (Sbikha)were exposed to nutrient solution containing either low (40 mM) or high (160 mM) doses of NaCl or 15% polyethylene glycol. The low NaCl dose stimulated plant growth in both populations. Plants from Monastir were more resistant to high salinity and exhibited a greater ability to produce glycinebetaine in response to salt stress. Conversely, plants from Sbikha were more resistant to water stress and displayed a higher rate of proline accumulation. Proline accumulated as early as 24 h after stress imposition and such accumulation was reversible. By contrast, glycinebetaine concentration culminated after 10 d of stress and did not decrease after the stress relief. The highest salt resistance of Monastir plants was not due to a lower rate of Na absorption; plants from this population exhibited a higher stomatal conductance and a prodigal water-use strategy leading to lower water-use efficiency than plants from Sbikha. Exogenous application of proline (1 mM) improved the level of drought resistance in Monastir plants through a decrease in oxidative stress quantified by the malondialdehyde concentration, while the exogenous application of glycinebetaine improved the salinity resistance of Sbikha plants through a positive effect on photosystem II efficiency.
Url:
DOI: 10.1093/jxb/ern040
Affiliations:
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These important environmental constraints may also have specific effects on plant physiology. Stress-induced accumulation of osmocompatible solutes was analysed in two Tunisian populations of the Mediteranean shrub Atriplex halimus L.plants originating from a salt-affected coastal site (Monastir) or from a non-saline semi-arid area (Sbikha)were exposed to nutrient solution containing either low (40 mM) or high (160 mM) doses of NaCl or 15% polyethylene glycol. The low NaCl dose stimulated plant growth in both populations. Plants from Monastir were more resistant to high salinity and exhibited a greater ability to produce glycinebetaine in response to salt stress. Conversely, plants from Sbikha were more resistant to water stress and displayed a higher rate of proline accumulation. Proline accumulated as early as 24 h after stress imposition and such accumulation was reversible. By contrast, glycinebetaine concentration culminated after 10 d of stress and did not decrease after the stress relief. The highest salt resistance of Monastir plants was not due to a lower rate of Na absorption; plants from this population exhibited a higher stomatal conductance and a prodigal water-use strategy leading to lower water-use efficiency than plants from Sbikha. Exogenous application of proline (1 mM) improved the level of drought resistance in Monastir plants through a decrease in oxidative stress quantified by the malondialdehyde concentration, while the exogenous application of glycinebetaine improved the salinity resistance of Sbikha plants through a positive effect on photosystem II efficiency.</div></front></TEI><affiliations><list><country><li>Belgique</li><li>Tunisie</li></country><region><li>Vienne (Autriche)</li></region><settlement><li>Vienne (Autriche)</li></settlement></list><tree><country name="Tunisie"><noRegion><name sortKey="Hassine, Abir Ben" sort="Hassine, Abir Ben" uniqKey="Hassine A" first="Abir Ben" last="Hassine">Abir Ben Hassine</name></noRegion><name sortKey="Bouzid, Sadok" sort="Bouzid, Sadok" uniqKey="Bouzid S" first="Sadok" last="Bouzid">Sadok Bouzid</name></country><country name="Belgique"><region name="Vienne (Autriche)"><name sortKey="Ghanem, Michel Edmond" sort="Ghanem, Michel Edmond" uniqKey="Ghanem M" first="Michel Edmond" last="Ghanem">Michel Edmond Ghanem</name></region><name sortKey="Lutts, Stanley" sort="Lutts, Stanley" uniqKey="Lutts S" first="Stanley" last="Lutts">Stanley Lutts</name><name sortKey="Lutts, Stanley" sort="Lutts, Stanley" uniqKey="Lutts S" first="Stanley" last="Lutts">Stanley Lutts</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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