Proline accumulates in<i>Casuarina equisetifolia</i>seedlings under salt stress

Tani, Chiharu; Sasakawa, Hideo

doi:10.1111/j.1747-0765.2006.00005.x

Cited by 30 publications

(15 citation statements)

References 16 publications

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“…In our study, an increase in shoot proline content in responses to salt stress was recorded and found highly correlated to NaCl concentrations. This result is in agreement with the data obtained by Tani and Sasakawa (2006). Our results strongly suggest that C. glauca, like other species of the genus Casuarina that are highly tolerant to salt stress, synthesize L-Proline as a major compatible solute to adjust the osmotic pressure when the ionic form of Na accumulates in the cells and sustain the cell against homeostasis.…”

Section: Discussionsupporting

confidence: 95%

“…Enhancing Casuarina growth will help improve management practices of soil salinity and improves the sustainable use of irrigated lands. Accumulation of osmoprotectant molecules may also play important roles in raising the tolerance of inoculated Casuarina tree to salt stress (Tani and Sasakawa 2006). Therefore, our study was carried out to evaluate the survival, growth performance and nodulation ability of Casuarina seedlings grown in hydroponic N-free medium supplemented with different NaCl concentrations (50,100,200,300,400 and 500 mM) after being inoculated with two salt tolerant Frankia strains.…”

Section: Introductionmentioning

confidence: 99%

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Influence of salt stress on inoculated Casuarina glauca seedlings

et al. 2016

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Salinity is a serious threat to agriculture in arid and semi-arid regions including Egypt. There is currently a need to select highly salt-tolerant plants to improve recycling of agricultural drainage waters. Due to the importance of Casuarina in soil reclamation and rehabilitation, our study was carried out to evaluate the survival and growth of inoculated Casuarina glauca in hydroponic N-free medium supplemented with different NaCl concentrations (50, 100, 200, 300, 400 and 500 mM). Salt tolerant Frankia strains CcI156 and CgIM4, isolated from root nodules of Casuarina trees grown in loamy sand soils in Egypt, were used for seedling inoculation. Our results showed that inoculated Casuarina seedlings were able to withstand up to 200 mM NaCl. At higher NaCl concentrations (300 to 500 mM), the seedling died gradually three days after exposure to salt stress. However, at lower NaCl (50 mM) concentration, inoculated C. glauca seedlings showed a higher growth rate and higher percentages of nodulation. Nitrogenase activity and the total nitrogen content of nodulated seedlings were also influenced by elevated NaCl concentrations and recorded a reduction at high concentration (200 mM). Salt stress had a strong effect on biosynthesis of osmoprotectants molecules like L-Proline and carbohydrates, which strongly correlated (r = 0.98 and 0.87, respectively) with increasing salt concentrations.

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Section: Discussionsupporting

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Influence of salt stress on inoculated Casuarina glauca seedlings

et al. 2016

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“…Soluble sugar accumulation has been reported with salt and drought stresses (Munns, 2005); likewise, phenolic compounds help in scavenging free radicals and protecting plants against the damaging effects of increased ROS levels due to salt and drought stresses (Petridis et al, 2012). Proline accumulation counter balances the deleterious effects of water deficit and salinity (Tani and Sasakawa, 2006;Ashraf and Foolad, 2007) and may serve as an organic nitrogen reserve that can be utilized during recovery from stress (Sairam and Tyagi, 2004). Proline accumulation cooccurred with higher activities of antioxidant enzymes (glutathione peroxidase) in younger seedlings, proving proline's role in activating antioxidant defenses in plants (Rejeb et al, 2014).…”

Section: Use Of Plant Growth Regulators and Compatible Solutesmentioning

confidence: 99%

Drought and salinity stresses in barley: Consequences and mitigation strategies

et al. 2019

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Recent trends show reductions in crop productivity worldwide due to severe climatic change. Different abiotic stresses significantly affect the growth and development of plants, leading to decreased crop yields. Salinity and drought stresses are the most common abiotic stresses, especially in arid and semi-arid regions, and are major constraints for barley production. The present review attempts to provide comprehensive information related to barley plant responses and adaptations to drought and salinity stresses, including physiological and agronomic, in order to alleviate the adverse effect of stresses in barley. These stresses reduce assimilation rates, as they decrease stomatal conductance, disrupt photosynthetic pigments, reduce gas exchange, enhance production of reactive oxygen species, and lead to decreased plant growth and productivity. This review focuses on the strategies plants use to respond and adapt to drought and salinity stress. Plants utilize a range of physiological and biochemical mechanisms such as adaptation strategies, through which the adverse effects can be mitigated. These include soil management practices, crop establishment, as well as foliar application of anti-oxidants and growth regulators that maintain an appropriate level of water in the leaves to facilitate adjustment of osmotic and stomatal performance. The present review highlighted the adverse effect of drought and salinity stresses barley and their mitigation strategies for sustainable barley production under changing climate. They review also underscored that exogenous application of different antioxidants could play a significant role in the alleviation of salinity and drought stress in plant systems.

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“…The magnitude of increase in free proline accumulation was higher in the tolerant cultivars than in the sensitive ones (Kumar et al . 2003; Misra and Gupta 2005; Tani and Sasakawa 2006).…”

Section: Introductionmentioning

confidence: 99%

Physiological and growth responses of two different salt-sensitive cucumber cultivars to NaCl stress

Zhu

Bie

2008

Soil Science and Plant Nutrition

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The effect of NaCl stress on the growth, membrane permeability, anti-oxidant enzyme activities and ion content of cucumber seedlings was investigated. Two cultivars (Jinchun No. 2, a relatively salt-sensitive cultivar, and Zaoduojia, a relatively salt-tolerant cultivar) of cucumber were used. Shoot and root dry weights, plant height, stem diameter, leaf area and leaf number of both cultivars decreased when NaCl concentrations increased. The decreases in shoot and root dry weights and leaf area were more significant in Jinchun No. 2 than in Zaoduojia. Meanwhile, the salt injury index, the membrane permeability, malondialdehyde (MDA) contents, superoxide dismutase (SOD) and peroxidase (POD) activities of both cultivars increased significantly with salt stress, and the increases in the salt injury index and MDA were higher in Jinchun No. 2 than in Zaoduojia, whereas the increase in POD activity was lower in Jinchun No. 2 than in Zaoduojia. Free proline content of Zaoduojia increased markedly with increasing concentrations of NaCl, whereas the content of Jinchun No. 2 was unaffected by salt stress. In addition, the contents of Na + in the leaf, stem and root of both cultivars increased significantly, whereas the contents of K + decreased significantly, resulting in an increase in the Na + /K + ratio when NaCl concentrations increased. These results suggest that Zaoduojia exhibits a better protection mechanism against oxidative damage and lipid peroxidation by maintaining higher proline content and POD activity than the salt-sensitive Jinchun No. 2 cultivar.

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Proline accumulates inCasuarina equisetifoliaseedlings under salt stress

Cited by 30 publications

References 16 publications

Influence of salt stress on inoculated Casuarina glauca seedlings

Influence of salt stress on inoculated Casuarina glauca seedlings

Drought and salinity stresses in barley: Consequences and mitigation strategies

Physiological and growth responses of two different salt-sensitive cucumber cultivars to NaCl stress

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