The effect of pulsed versus gradual salinity reduction on the physiology and survival of Halophila johnsonii Eiseman

摘要: Plants of Halophila johnsonii Eiseman were exposed, in mesocosms, to either pulsed hyposalinity treatments 30, 15, 10, and 8 or gradual salinity reductions two every 2 days. When was pulsed, survivorship (>80 %) maximum quantum yields (>0.7) high the 30 15 treatments, but both declined 10 treatments. Leaf osmolality with respect treatment, difference between leaf media remained relatively constant (675 ± 177 mmol kg−1). In contrast, when gradually reduced, from salinities 4, 6. linearly and, similar (638 161 Trolox equivalent antioxidant capacity over time reduction. The results indicate that H. is more tolerant than has previously been reported reducing extended its low-salinity tolerance threshold by approximately a 10.