Arbuscular mycorrhizal inoculation improves growth and antioxidative response of Jatropha curcas (L.) under Na sub(2)SO sub(4) salt stress

• Published in: Plant biosystems Vol. 149; no. 2; pp. 260 - 269
• Main Authors: Kumar, A, Sharma, S, Mishra, S, Dames, J F
• Format: Journal Article
• Language: English
• Published: 04-03-2015
• Subjects: Jatropha curcas
• DOI: 10.1080/11263504.2013.845268
• EISSN: 1724-5575
• ISSN: 1126-3504

This study investigated the effect of arbuscular mycorrhizal (AM) fungal consortia on growth, photosynthetic pigments, solutes concentration (e.g., sugars and proline), and antioxidant responses at different levels of Na sub(2)SO sub(4) stress (0-0.5%, w:w) in potted culture of Jatropha. Results showed that increasing salt levels caused a significant reduction in survival (%), growth parameters, leaf relative water content (LRWC) (%), and chlorophyll content with an increase in electrolyte leakage (%) and lipid peroxidation of membranes of Jatropha. AM inoculation improved biomass yields as well as other physiological parameters (LRWC (%), chlorophyll, proline, and soluble sugar) of salt-stressed Jatropha over noninoculated plants. Tolerance index of Jatropha was higher with AM fungi than without at all salt levels; however, a decline in its value was recorded with increased salinity levels. AM inoculation also enhanced the activities of antioxidant enzymes (e.g., superoxide dismutase, peroxidase, ascorbate peroxidase, and glutathione reductase) and decreased oxidative damage to lipids. In conclusion, results indicate that AM inoculation was capable of alleviating the damage caused by salinity stress on Jatropha plants by reducing lipid peroxidation of membrane and membrane permeability and increasing the accumulation of solutes and antioxidant enzyme activity.