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Acacia ampliceps  (salt wattle), a leguminous shrub, has been introduced in salt-affected areas in the northeast of Thailand for the remediation of saline soils. However, the defense mechanisms underlying salt tolerance  A. ampliceps  are unknown. We investigated various physio-biochemical and morphological attributes of  A. ampliceps  in response to varying levels of salt treatment (200–600 mM NaCl). Seedlings of  A. ampliceps  (25 ± 2 cm in plant height) raised from seeds were treated with 200 mM (mild stress), 400 and 600 mM (extreme stress) of salt treatment (NaCl) under greenhouse conditions. Na +  and Ca 2+  contents in the leaf tissues increased significantly under salt treatment, whereas K +  content declined in salt-stressed plants. Free proline and soluble sugar contents in plants grown under extreme salt stress (600 mM NaCl) for 9 days significantly increased by 28.7 (53.33 μmol g –1  FW) and 3.2 (42.11 mg g –1  DW) folds, respectively over the control, thereby playing a major role as osmotic adjustment. Na +  enrichment in the phyllode tissues of salt-stressed seedlings positively related to total chlorophyll (TC) degradation ( R  2  = 0.72). Photosynthetic pigments and chlorophyll fluorescence in salt-stressed plants increased under mild salt stress (200 mM NaCl). However, these declined under high levels of salinity (400–600 mM NaCl), consequently resulting in a reduced net photosynthetic rate ( R  2  = 0.81) and plant dry weight ( R  2  = 0.91). The study concludes that  A. ampliceps  has an osmotic adjustment and Na +  compartmentation as effective salt defense mechanisms, and thus it could be an excellent species to grow in salt-affected soils.

Physio-biochemical and morphological characters of halophyte legume shrub, Acacia ampliceps seedlings in response to salt stress under greenhouse