Effet de la salinité sur la fluorescence chlorophyllienne, la teneur en proline et la production florale de trois espèces ornementales

Tropicultura 01/2005;
Source: DOAJ


Effect of Chloride Sodium on Chlorophyll Fluorescence, Plant Proline Content and Flowers Production of Three Ornamental Species. Three ornamental species (Zinnia elegans, Tagetes patula and Petunia hybrida) were used to test sodium chloride effect on chlorophyll fluorescence, plant proline content and flowers production. Three treatments were used in this trial: 0, 2 and 4 g of Nacl.l-1 of irrigation water. The results showed that chlorophyll fluorescence was not affected by sodium chloride treatment but plant proline content increased and flowers production decreased as NaCl doses increase.

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Available from: Mounir Denden, Jan 27, 2014
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    • "Soil and water salinity have been considered a limiting factor to crop production in arid and semiarid regions of the world (Denden et al., 2005). Coping with salt stress is a global matter to ensure agricultural survival and sustainable food production. "
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    ABSTRACT: The comparative effects of salt stress on osmotic adjustment and solutes accumulation in relation to root–leaf tissue senescence of two silage maize varieties were examined. Studies were carried out with seedlings of two forage maize varieties (Aristo and Arper) subjected to 0, 34, 68 and 102 mM NaCl for 6 weeks under glasshouse conditions. Osmotic potential (OP), osmotic adjustment (OA) and solutes accumulation were quantified in primary roots and in three leaf stages (young, mature and senescent leaves). Moreover, in order to assess the distribution of proline and glycine betaine during root development, the two components were analyzed at different position from the primary root apex of both varieties.The total dry matter was significantly dropped with increasing salinity and reduction was greater in Aristo than in Arper. Salt stress impact in terms of ionic status was more pronounced in roots than in leaves and in older leaves than younger ones. In this setting, Aristo displayed a more sensitivity than Arper. A close relationship between the age of root–leaf tissue and proline and glycine betaine allocation, as salinity response, was shown. During the stress treatment, the accumulation of the two components was higher in growing regions of roots and in young leaves. While total free amino acids (FAA) and sugars were accumulated in roots as well as leaves but preferentially in the mature leaves. The capacity of OA was greater in young than in mature and/or senescent leaves and the contribution efficiency of organic solutes to this occurrence tended to be higher in Arper than in Aristo. Moreover, glycine betaine and proline appeared to be the main solutes that contributed ably to OA mainly in growing regions followed by sugars and other FAA. Inorganic solutes (K+ and Ca2+), however, did not seem to play an important role in OA since their amounts were often reduced in response to salt tolerance.
    Industrial Crops and Products 01/2010; 31(1-31):122-130. DOI:10.1016/j.indcrop.2009.09.007 · 2.84 Impact Factor
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    ABSTRACT: Reaumuria vermiculata is a gypso—halophytic plant belonging to the Tamaricaceae family. The physiological response of this species, expressed by the weight growth, nutritional response and osmotic adjustment, has been studied. Different NaCl concentrations varying from 0 to 700 mM were tested. We demonstrated that Reaumuria vermiculata is a halophyte with growth none significantly affected by 100 and 300 mM salinity concentration. In fact, the total biomass of cultivated plants at 100 and 300 mM represents 78.5 and 70.5% of the control, respectively. Mineral analysis showed a Na+ accumulation gradient from the roots toward the aerial organs. Indicative of an osmotic strategy for transporting salt compartmentalizing it in vacuoles. Furthermore the proline content regularly increased at medium salinity. Varying from 60 μM.g−1 dry weight in the control aerial organs up to 220 μM.g−1 dry weight at 700 mM NaCl.
    Acta botanica Gallica: bulletin de la Société botanique de France 04/2013; 158(3):291-301. DOI:10.1080/12538078.2011.10516274 · 0.48 Impact Factor
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    ABSTRACT: Rhizobacterial populations isolated from saline soils aid in plant survival through several mechanisms. Nevertheless, plant growth-promoting bacteria found in association with plants grown under chronically stressful conditions, including high salinity, may have adapted to the stress conditions, and could provide a significant benefit to the plants. In the present study, the main objective was to evaluate the effect of three bacterial strains, selected as PGPR from wild barley (Hordeum maritimum L) rhizosphère, on growth and salt tolerance of this plant. Different growth parameters, chlorophyll content, electrolyte leakage, water content and biochemical properties were analysed in the inoculated plants submitted to 200mM NaCl. The inoculation increased plant dry weight, root and shoot length, soluble sugars concentrations in all plant tissues and enhanced leaf chlorophyll under salt stress. Moreover, proline content and MDA were significantly higher in un-inoculated plants subject to salt. Therefore, it could be predicted that all these parameters cumulatively improve plant growth under saline conditions in the presence of rhizobacteria. Based on the results of their experiment, the authors conclude that rhizobacteria inoculation may facilitate plant growth under salt stress.