Effect of polyamines on seedlings of two mango (Mangifera indica L.) Rootstocks under salt stress
2011
Lata, Kanchan | Srivastav, Manish | Dubey, A.K. | Singh, A.K. | Sairam, R.K.
A study was conducted to investigate the effects of polyamines (putrescine and spermidine) on photosynthetic pigments, relative water content (RWC), membrane injury (MI), proline content and activities of antioxidant enzymes like superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) in 1-year-old seedlings of mango rootstock Kurukkan and non-descript mango under NaCl stress. Results indicated that polyamines mitigated the salinity stress and reduced membrane injury of mango seedlings by 57% (Spd) and 27% (Put) 60 days after salt treatment over non-treated salinised plants. Polyamines increased the endogenous proline content, and salinised plants treated with polyamines had 35% (Spd) and 21% (Put) higher proline content than salinised plants without polyamines treatment. Higher antioxidant enzyme activity was also observed in salinised plants treated by polyamines than salinised plants without polyamine treatments. The effect of spermidine was greater than putrescine in terms of activity of antioxidant enzymes in mango rootstocks. In comparison to salinised plants without polyamines treatment, salinised plants treated with spermidine had higher SOD (12.0%) and CAT (11.3%) activities 60 days after salt treatment. Our results suggest that modulating effect of polyamines on mango rootstock plants under salt stress may be attributed to increased photosynthetic pigments, relative water content, proline and antioxidant enzymes activity and by reducing membrane injury in mango rootstocks.
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