Irrigation with 5 mS cm-1 sea-like water compared to 1 mS cm-1 one (control) did not affect Na+ and Cl- accumulation in leaves of less vigorous watermelon cv. Sugar Baby (SB), whereas it enhanced these ion levels in very vigorous cv. Crimson Sweet (CS). In both cvs. salinity stimulated thiobarbituric acid reactive substance production in leaves. Following stress, H2O2 concentration remained constant in SB leaves, and a concomitant doubling in superoxide dismutase (SOD) activity and total ascorbate content was recorded. On the contrary, a remarkable increase in H2O2 was observed in CS, accompanied by a reduction of SOD and ascorbate peroxidase activities as well as ascorbate level. Generally, salinity did not cause significant changes in leaf phenols and total antioxidant activity. More concentrated sea-like water caused 22 and 43% yield reduction in SB and in CS, respectively. Lower Na+ accumulation and higher antioxidant activity made SB more suitable for cultivation under saline conditions.
Watermelon leaf antioxidant defence under sea-like water irrigation differs with growth vigour
Sgherri C.Ultimo
Methodology
2018-01-01
Abstract
Irrigation with 5 mS cm-1 sea-like water compared to 1 mS cm-1 one (control) did not affect Na+ and Cl- accumulation in leaves of less vigorous watermelon cv. Sugar Baby (SB), whereas it enhanced these ion levels in very vigorous cv. Crimson Sweet (CS). In both cvs. salinity stimulated thiobarbituric acid reactive substance production in leaves. Following stress, H2O2 concentration remained constant in SB leaves, and a concomitant doubling in superoxide dismutase (SOD) activity and total ascorbate content was recorded. On the contrary, a remarkable increase in H2O2 was observed in CS, accompanied by a reduction of SOD and ascorbate peroxidase activities as well as ascorbate level. Generally, salinity did not cause significant changes in leaf phenols and total antioxidant activity. More concentrated sea-like water caused 22 and 43% yield reduction in SB and in CS, respectively. Lower Na+ accumulation and higher antioxidant activity made SB more suitable for cultivation under saline conditions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
