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Salt tolerance of a cash crop halophyte Suaeda fruticosa: biochemical responses to salt and exogenous chemical treatments

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Suaeda fruticosa Forssk is a leaf succulent obligate halophyte that produces numerous seeds under saline conditions. Seeds are a good source of high quality edible oil and leaves are capable of removing substantial amount of salt from the saline soil besides many other economic usages. Little is known about the biochemical basis of salt tolerance in this species. We studied some biochemical responses of S. fruticosa to different exogenous treatments under non-saline (0 mM), moderate (300 mM) or high (600 mM) NaCl levels. Eight-weekold seedlings were sprayed twice a week with distilled water, hydrogen peroxide (H₂O₂, 100 µM), glycine betaine (GB, 10 mM), or ascorbic acid (AsA, 20 mM) for 30 days. At moderate (300 mM) NaCl, leaf Na⁺, Ca2⁺ and osmolality increased, along with unchanged ROS and antioxidant enzyme activities, possibly causing a better plant growth. Plants grew slowly at 600 mM NaCl to avoid leaf Na⁺ buildup relative to those at 300 mM NaCl. Exogenous application of distilled water and H₂O₂ improved ROS scavenging mechanisms, although growth was unaffected. ASA and GB alleviated salt-induced growth inhibition at 600 mM NaCl through enhancing the antioxidant defense system and osmotic and ion homeostasis, respectively.
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  • Institute of Sustainable Halophyte Utilization (ISHU), University of Karachi, 75270 Karachi, Pakistan
  • Institute of Sustainable Halophyte Utilization (ISHU), University of Karachi, 75270 Karachi, Pakistan
  • Institute of Sustainable Halophyte Utilization (ISHU), University of Karachi, 75270 Karachi, Pakistan
  • Institute of Sustainable Halophyte Utilization (ISHU), University of Karachi, 75270 Karachi, Pakistan
  • Institute of Sustainable Halophyte Utilization (ISHU), University of Karachi, 75270 Karachi, Pakistan
  • Institute of Sustainable Halophyte Utilization (ISHU), University of Karachi, 75270 Karachi, Pakistan
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