Use of<i>Frankia</i>and Actinorhizal Plants for Degraded Lands Reclamation

Diagne, Nathalie; Karthikeyan, A.; Ngom, Mariama; Nambiar-Veetil, Mathish; Franche, Claudine; Narayanan, Krishna Kumar; Laplaze, Laurent

doi:10.1155/2013/948258

Cited by 78 publications

(50 citation statements)

References 56 publications

(75 reference statements)

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“…Like rhizobia–legume symbioses, bacteria are hosted in root nodules and fix atmospheric nitrogen (Perrine-Walker et al, 2011). Some actinorhizal plants such as Casuarinaceae trees are largely used in land reclamation pros including salinized land (reviewed in Diagne et al, 2013). Several studies have therefore reported strategies to improve the tolerance of these plants to salt stress.…”

Section: Strategies To Improve Salt Tolerance In Cropsmentioning

confidence: 99%

New Insights on Plant Salt Tolerance Mechanisms and Their Potential Use for Breeding

et al. 2016

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Soil salinization is a major threat to agriculture in arid and semi-arid regions, where water scarcity and inadequate drainage of irrigated lands severely reduce crop yield. Salt accumulation inhibits plant growth and reduces the ability to uptake water and nutrients, leading to osmotic or water-deficit stress. Salt is also causing injury of the young photosynthetic leaves and acceleration of their senescence, as the Na+ cation is toxic when accumulating in cell cytosol resulting in ionic imbalance and toxicity of transpiring leaves. To cope with salt stress, plants have evolved mainly two types of tolerance mechanisms based on either limiting the entry of salt by the roots, or controlling its concentration and distribution. Understanding the overall control of Na+ accumulation and functional studies of genes involved in transport processes, will provide a new opportunity to improve the salinity tolerance of plants relevant to food security in arid regions. A better understanding of these tolerance mechanisms can be used to breed crops with improved yield performance under salinity stress. Moreover, associations of cultures with nitrogen-fixing bacteria and arbuscular mycorrhizal fungi could serve as an alternative and sustainable strategy to increase crop yields in salt-affected fields.

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Section: Strategies To Improve Salt Tolerance In Cropsmentioning

confidence: 99%

New Insights on Plant Salt Tolerance Mechanisms and Their Potential Use for Breeding

et al. 2016

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“…Under saline environments, Casuarina has proven a greatest potential in N 2 -fixation when inoculated with compatible Frankia strains leading to effective nodule formation and in turn improving Casuarina growth (Reddell et al 1986;Diagne et al 2013). Enhancing Casuarina growth will help improve management practices of soil salinity and improves the sustainable use of irrigated lands.…”

Section: Introductionmentioning

confidence: 99%

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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“…Frankia forms a perennial root organ called nodule where bacteria are hosted. Two type of nodules formation occur in actinorhizal symbiosis, the intercellular and extracellular infections (Benson and Silvester, 1993;Diagne et al, 2013).…”

Section: Discussionmentioning

confidence: 99%