Effect of salt stress on the physiology of Frankia sp strain CcI6

Abstract

Actinorhizal plants are able to overcome saline soils and reclaim land. Frankia sp strain CcI6 was isolated from nodules of Casuarina cunninghamiana found in Egypt. Phylogenetic analysis of Frankia sp. strain CcI6 revealed that the strain is closely related to Frankia sp. strain CcI3. The strain displays an elevated level of NaCl tolerance. Vesicle production and nitrogenase activity were also influenced by NaCl.

Symbiotic Performance of Diverse Frankia Strains on Salt-Stressed Casuarina glauca and Casuarina equisetifolia Plants

“…Casuarina isolates show contrasting responses in their salt tolerance (Ngom et al, 2016). Indeed, some strains are more tolerant in vitro to salt stress than others even though they were isolated from the same host plant (Dawson and Gibson, 1987; Fauzia, 1999; Tani and Sasakawa, 2003; Oshone et al, 2013). Nevertheless, the symbiotic performance under salt stress of diverse Frankia strains toward Casuarinaceae species remains poorly understood.…”

Plant Microbes Symbiosis: Applied Facets

“…The osmotic stress is currently one of the most serious environmental factors in agriculture (Manchanda and Garg 2008 ). Salinity also affects nitrogenase activity in legumes (Cordovilla et al 1999 ) and actinorhizal plants Oshone et al 2013 ) and consequently reduces N 2 fi xation. Many reports stressed that toxicity is mainly due to plant uptake of salts.…”

“…Consequently, inoculation with more tolerant symbiotic bacterial strains with effi cient nodulation and N 2 fi xation under saline conditions may contribute to the compensation of the salinity-induced plant growth loss (Girgis et al 1992 ;Hafeez et al 1999 ;Zahran 2001 ;Tani and Sasakawa 2003 ). Several salt-tolerant Rhizobium and Frankia species have been reportedly isolated that could tolerate saline environments (Rai 1983 ;Hafeez et al 1999 ;Tani and Sasakawa 2003 ;Srivastava et al 2012 ;Oshone et al 2013 ). Several salt-tolerant Rhizobium and Frankia species have been reportedly isolated that could tolerate saline environments (Rai 1983 ;Hafeez et al 1999 ;Tani and Sasakawa 2003 ;Srivastava et al 2012 ;Oshone et al 2013 ).…”

Draft Genome Sequence of Frankia sp. Strain CcI6, a Salt-Tolerant Nitrogen-Fixing Actinobacterium Isolated from the Root Nodule of Casuarina cunninghamiana

“…strain CcI6 was isolated from root nodules of Casuarina cunninghamiana grown in Egypt and shown to reinfect C. cunninghamiana, Casuarina glauca , and Casuarina equisetifolia (11). This strain showed an increased level of NaCl tolerance (12). Based on 16S phylogenetic analysis, this strain is close to Frankia sp.…”