Nodulation et croissance nodulaire chez le haricot 
(<i>Phaseolus vulgaris</i>) sous contrainte saline

Saadallah, Kaouthar; Drevon, Jean‐Jacques; Abdelly, Chédly

doi:10.1051/agro:2001154

Cited by 36 publications

(23 citation statements)

References 29 publications

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“…It was expressed in percent according to the expression: SI Cu = [100 x (DW Cu -DW control )]/DW control . This parameter was more negative when the plant was sensitive to copper (Saadallah et al, 2001). …”

Section: Sensitivity Indexmentioning

confidence: 98%

Short-term physiological responses to copper stress in Salvinia auriculata Aubl.

et al. 2014

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Aim: To evaluate, in a short-time exposure, the physiological responses of Salvinia auriculata Aubl. under different concentrations of Cu. Methods: The plants were exposed to treatments with 0.01, 0.1, 1 and 10 mM of Cu in a period of 2 days. Then development variables of S. auriculata (weight, photosynthetic pigments, and soluble carbohydrate), lipid peroxidation (malondialdehyde, aldehydes, and electrolyte leakage) and production of antioxidants (anthocyanins, carotenoids, flavonoids, and proline) were evaluated. Results: It was observed fresh weight reductions in concentrations above 1 mM of Cu. Chlorophyll a decreased with the increase of Cu concentrations unlike chlorophyll b. The ratio chlorophyll a / chlorophyll b was changed due to the degradation of photosynthetic pigments. The reductions of carotenoids were more pronounced than that of total chlorophyll. The values of electrolyte leakage ranged from 14 to 82 % and lipid peroxidation from 7 to 46 nmol.g -1. Flavonoids and soluble carbohydrates showed reductions with the increase of Cu concentration. Anthocyanins, phenolic compounds, and proline when subjected to 0.1 mM of Cu had increased, suggesting adaptability of plant stress caused directly by metal and reactive oxygen species. In higher concentrations, degradation and/or direct modifications of these molecules possibly occurred. Conclusions: The data suggest that S. auriculata is provided with an efficient mechanism against stress caused by Cu in the concentration of 0.1 mM. As for higher concentrations (1 and 10 mM), despite its role as micronutrients, Cu was toxic to the plant due to the redox behavior of this metal, which leads to the exacerbated formation of reactive oxygen species, inducing to severe damage such as biological membrane degradation and protein denaturation.Keywords: lipid peroxidation, antioxidant, proline, metal stress.Resumo: Objetivo: avaliar em curto tempo de exposição às respostas fisiológicas de Salvinia auriculata Aubl. sob diferentes concentrações de Cu. Métodos: as plantas foram expostas a tratamentos com 0,0; 0,01; 0,1; 1 e 10 mM de Cu em um período de 2 dias. Em seguida foram avaliadas variáveis de desenvolvimento de S. auriculata (peso, pigmentos fotossintéticos e carboidratos solúveis), peroxidação lipídica (malonaldeído, aldeídos e extravasamento de eletrólitos) e produção de antioxidantes (antocianinas, carotenóides, flavonóides e prolina). Resultados: Foram verificadas reduções das massas frescas nas concentrações acima de 1 mM de Cu. A clorofila a reduziu com o aumento da concentração de Cu, diferentemente da clorofila b. A razão clorofila a/clorofila b foi alterada, devido à degradação dos pigmentos fotossintéticos. As reduções dos carotenóides foram mais acentuada do que a de clorofila total. Os valores de extravasamento de eletrólitos variaram de 14 a 82 % e peroxidação lipídica de 7 a 46 nmol.g -1. Flavonóides e carboidratos solúveis mostraram reduções com o aumento da concentração de Cu. Antocianinas, compostos fenólicos e prolina quando submetida...

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Section: Sensitivity Indexmentioning

confidence: 98%

Short-term physiological responses to copper stress in Salvinia auriculata Aubl.

et al. 2014

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“…In addition to its effect on the growth of host plant, salinity affects nodule establishment (Ikeda 1994;Aydi et al 2004), growth (Velagaleti and Marsh 1989;Saadallah et al 2001) and symbiotic activity (Cordovilla et al 1996). However, a stimulation of nodule growth has been observed in some legume species subjected to salt stress like faba bean (Yousef and Sprent 1983), tolerant cultivars of chickpea (Soussi et al 1999) and some lines of Medicago truncatula (Aydi et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Growth, nitrogen fixation and ion distribution in Medicago truncatula subjected to salt stress

2008

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This study compared the growth, nodulation, N 2 fixation, and ion distribution in three Medicago truncatula lines, in response to salt in nutrient solution. Two local lines (TN8.20 and TN6.18) and a reference line (Jemalong 6) were inoculated with a reference strain Sinorhizobium meliloti 2011, a very tolerant strain to salinity (700 mM NaCl) and grown in a controlled glasshouse with or without 75 mM NaCl. A genotypic variation in tolerance to salt was found: TN6.18 was the most sensitive line whereas TN8.20 was the most tolerant. The relative tolerance of TN8.20 was concomitant with the lowest leaf Na + concentration and the highest nodule biomass production. However, nodule efficiency (amount of nitrogen fixed per g dry weight nodule) decreased in all lines. Results suggest that the tolerance to salt seems to depend on the host plant ability to protect its leaves against an excessive Na + (and Cl − ) accumulation, and its ability to maintain the development of an abundant nodular system, which in turn determines an important rate of nitrogen fixation and allows the plants to conserve their growth potentialities. The loss of the nodular efficiency under salt stress seems to be compensated by a large nodule biomass.

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“…This finding was also observed in Phaseolus vulgaris (Saadallah et al, 2001), chick pea (Tejera et al, 2005) and Leucaena leucocephala (Anthraper et al, 2003). According to Gordon et al (1997), the decrease of nodule DW in the presence of salt could be related to a limitation of both root growth and the feeding of these organs with photosynthates, likely owing to (i) the decrease of photosynthetic activity under salt stress (Lopez et al, 2008) and (ii) the inhibition of enzymes associated with sucrose degradation (Gonzalez et al, 1998;Lopez et al, 2008).…”

Section: Discussionmentioning

confidence: 60%

“…In addition, salinity impacts the nodule development (Gage, 2004) and decreases N 2 fixing capacity (Anthraer and Dubois, 2003). Different mechanisms of the symbiotic interaction as well as nodule development and metabolism are affected by salt stress, leading to the reduction in nodule number and limited nitrogen fixation (Saadallah et al, 2001). The limitation of symbiotic nitrogen fixation by salt stress has been attributed to a reduction in nodules respiration, through a decrease in oxygen diffusion to the infected zone , the enhancement of reactive oxygen species accumulation in the nodules (Jebara et al, 2005), and also a limitation of bacteroid supply with the energetic substrates following reduced photosynthetic activity and nodule sucrose reduction (Gàlvez et al, 2005;Lopez et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Eco-physiological responses and symbiotic nitrogen fixation capacity of salt-exposed Hedysarum carnosum plants

Kouas¹,

Slatni²,

Salah³

et al. 2010

Afr. J. Biotechnol.

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Nitrogen nutrition of Hedysarum carnosum, a pastoral legume common in Tunisian central and southern rangelands, largely depends on atmospheric nitrogen fixation. Yet, this process is greatly affected by environmental factors such as salinity. This study aimed to characterize the tolerance limits and the physiological responses of H. carnosum to salinity under symbiotic nitrogen fixation. Salt treatment was imposed by adding NaCl at different concentrations (0, 50, 100 and 200 mM) to the nutrient solution. Na + content generally increased in the plant organs with increasing salinity in the culture medium. Especially, an excess accumulation of this cation was observed in leaves. Despite the fact that Na + accumulation decreased plant growth, both nodulation and symbiotic nitrogen fixation capacity of H. carnosum appeared to be relatively salt-tolerant, owing to the plant capacity to maintain tissue hydration, control Na + accumulation in shoots, and to conserve nodule efficiency to fix N 2 . Taken together, our findings indicate that H. carnosum is a glycophyte that can tolerate moderate salinity (100 mM), suggesting its possible utilization (i) in the improvement of soil fertility and (ii) in saline pastures, where the survival of other fodder species is critical.

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Nodulation et croissance nodulaire chez le haricot (Phaseolus vulgaris) sous contrainte saline

Cited by 36 publications

References 29 publications

Short-term physiological responses to copper stress in Salvinia auriculata Aubl.

Short-term physiological responses to copper stress in Salvinia auriculata Aubl.

Growth, nitrogen fixation and ion distribution in Medicago truncatula subjected to salt stress

Eco-physiological responses and symbiotic nitrogen fixation capacity of salt-exposed Hedysarum carnosum plants

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