Salt Tolerance in Aquatic Macrophytes: Ionic Relation and Interaction

Rout, N.P.; Shaw, Birendra Prasad

doi:10.1023/a:1017978506585

Cited by 48 publications

(24 citation statements)

References 21 publications

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“…According to Esteves & Suzuki (2008), excess salinity also reduces Mg 2+ absorption by plants, corroborated herein. Decreases in Mg 2+ content have also been described in other species, such as E. crassipes and P. stratiotes (Niaz & Rasul, 1998), Hydrilla verticillata (Rout & Shaw, 2001), Typha domingensis (Esteves & Suzuki, 2008) and S. natans (Jampeetong & Brix, 2009) subjected to different salinity concentrations.…”

Section: Discussionmentioning

confidence: 66%

Salinity effects on photosynthetic pigments, proline, biomass and nitric oxide in Salvinia auriculata Aubl.

et al. 2017

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Cite as: Gomes, M.A.C. et al. Salinity effects on photosynthetic pigments, proline, biomass and nitric oxide in Salvinia auriculata Aubl. Acta Limnologica Brasiliensia, 2017, vol. 29, e9. Abstract: Aims: Effects of salt stress on the physiology of Salvinia auriculata were investigated. Method: Plants were supplemented with 0, 50, 100 and 150 mmol L -1 NaCl and incubated for 5 days. NO content was evaluated after 2 hours and 5 days. Photosynthetic pigments, proline and nutrients were analyzed after 5 days. Major Results: Higher chlorophyll a content was observed in plants treated with 50 mmol L -1 , decreasing in higher NaCl concentrations, while chorophyll b content decreased with increasing NaCl concentrations. Exposure to 50 mmol L -1 NaCl increased biomass, while higher concentrations caused loss of biomass. Ca, K and Mg decreased with increasing NaCl concentrations, and the Na/K ratio was significantly increased at 150 mmol L -1 NaCl. Proline increased significantly at 150 mmol L -1 . Extracellular NO content increased after 2 hours, with significantly higher NO concentrations in roots observed at 50 mmol L -1 . Decreases in NO content were observed after 5 days. Conclusions: The results indicate that moderate salinity induces NO production earlier during incubation, probably associated to signaling for the production of compounds that assist in stress tolerance. At higher concentrations, this tolerance is reduced. This allows for further understanding of the physiological and biochemical mechanisms associated with the adaptation of this macrophyte to saline conditions, which, in turn, affect this species ecology and distribution in coastal areas.Keywords: Salvinia auriculata; salinity stress; nitric oxide; clorophyll; NaCl; macrophyte.Resumo: Objetivos: Efeitos do estresse salino sobre a fisiologia de Salvinia auriculata foram investigados. Metodologia: As plantas foram expostas a 0, 50, 100 e 150 mmol de NaCl L -1 e incubadas durante 5 dias. O conteúdo de NO foi avaliado após 2 horas e 5 dias. Pigmentos fotossintéticos, prolina e nutrientes foram analisados após 5 dias. Resultados Principais: Observou-se maior teor de clorofila a em plantas tratadas com 50 mmol L -1

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Section: Discussionmentioning

confidence: 66%

Salinity effects on photosynthetic pigments, proline, biomass and nitric oxide in Salvinia auriculata Aubl.

et al. 2017

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“…However, symbiotic nitrogen fixation by legumes is sensitive to environmental stresses particularly salinity (Serraj, 2002). In legumes, salinity can limit plant growth, cause both hyper-ionic and hyper-osmotic stress effects, depress symbiotic performance, etc (Rout and Shaw, 2001;Rao et al, 2002). Salt stress limits plant productivity in legumes through diminished photosynthetic efficiency, nitrogen fixation and carbon metabolism (Delgado et al, 1994;Soussi et al, 1998Soussi et al, , 1999Ferri et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Growth, photosynthesis, nodule nitrogen and carbon fixation in the chickpea cultivars under salt stress

Garg

Singla

2004

Braz. J. Plant Physiol.

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Four cultivars of chickpea, two of them of Mediterranean origin (kabuli), CSG 9651, BG 267 and two Indian (desi) types, CSG 8962, DCP 92-3, differing in their salt sensitivities were identified after screening ten genotypes in saline soils. The cultivars CSG 9651 and CSG 8962 were salt tolerant while BG 267 and DCP 92-3 were salt sensitive, respectively. The seeds of different cultivars were inoculated with Mesorhizobium ciceri, strain F: 75 and the plants were grown in the greenhouse. After the establishment of symbiosis, 15-day-old seedlings were administered doses of saline at varying concentrations (0, 4, 6, 8 dSm-1 NaCl, Na2SO4, CaCl2). Plants were harvested at 40, 70 and 100 days after sowing, for analyses. The main aim was to compare the relative salt tolerance of both desi and kabuli cultivars in terms of nitrogen fixation and carbon metabolism, as well as to ascertain whether the negative effects of saline stress on nitrogen fixation were due to a limitation of photosynthate supply to the nodule or to a limitation on the nodular metabolism that sustains nitrogenase activity. Plant growth, nodulation and nitrogenase activity was more severely affected in BG 267 and DCP 92-3 under salinity treatments (6 and 8 dSm-1) compared with CSG 9651 and CSG 8962. Nodule number as well as nodule mass increased under salt stress in CSG 9651 and CSG 8962 which might be responsible for their higher nitrogen fixation. Salinity reduced leaf chlorophyll and Rubisco activities in all cultivars. However, tolerant cultivars CSG 9651 and CSG 8962 showed smaller declines than the sensitive ones. Phosphoenolpyruvate carboxylase (PEPCase) activity increased significantly in the nodules of tolerant cultivars under salt stress at all harvests, and this was clearly related to salt concentrations. Our results suggest that in salt-affected soils tolerant cultivars have more efficient nodulation and support higher rates of symbiotic nitrogen fixation than the sensitive cultivars.

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“…The stem tissues also had a smaller but significant increase in Ca 2+ in plants exposed to NaCl while no change occurred in the roots. These increases were unexpected as NaCl has been shown to reduce the endogenous Ca 2+ concentration in plant tissues as a result of the competition between Ca 2+ and Na + (Rout and Shaw 2001). However, an increase in leaf Ca 2+ concentration has been previously found in woody species Prosopis cineraria (Ramoliya et al 2006) and Asparagus officinalis grown in sandy soil exposed to salinity (Warncke et al 2002).…”

Section: Discussionmentioning

confidence: 97%

Improving NaCl resistance of red-osier dogwood: role of CaCl2 and CaSO4

Renault

Affifi

2008

Plant Soil

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The influence of Ca 2+ salts on the resistance of red-osier dogwood (Cornus sericea) seedlings to salinity was investigated. Red-osier dogwood seedlings were exposed to 5 and 10 mM of CaCl 2 or CaSO 4 in the presence or absence of 50 mM NaCl for 40 days in a controlled environment. Seedlings exposed to CaCl 2 and CaSO 4 recovered from NaClinduced transpiration reduction after 20 days at a concentration of 10 mM and after 30 days at a concentration of 5 mM; while in absence of additional Ca 2+ , the seedlings recovered only after 40 days. Addition of 10 mM Ca 2+ to NaCl treatment also limited the accumulation of proline in leaf tissues and caused an increase in leaf and lateral shoot K + content. These results suggest that 10 mM Ca 2+ could alleviate, at least in part, the osmotic effect of NaCl on red-osier dogwood via control of stomatal closure. On the other hand, ion analysis showed that Ca 2+ addition was able to reduce the NaCl-induced Na + concentration only in stem tissues suggesting that Ca 2+ had only a limited effect on the ionic stress. The present study also showed an unexpected NaCl-induced increase in Ca 2+ content of leaves, lateral shoots and stems that was not observed in our previous hydroponics experiments and seems to be more characteristic of plants growing on sandy soils.

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Salt Tolerance in Aquatic Macrophytes: Ionic Relation and Interaction

Cited by 48 publications

References 21 publications

Salinity effects on photosynthetic pigments, proline, biomass and nitric oxide in Salvinia auriculata Aubl.

Salinity effects on photosynthetic pigments, proline, biomass and nitric oxide in Salvinia auriculata Aubl.

Growth, photosynthesis, nodule nitrogen and carbon fixation in the chickpea cultivars under salt stress

Improving NaCl resistance of red-osier dogwood: role of CaCl2 and CaSO4

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