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In this experiment, the effects of salinity from 0.0%, 0.5%, 1.0%, and 5.0 % NaCl on  Hibiscus syriacus  L. and  Hibiscus hamabo  Sieb. &amp; Zucc. seed germination with various temperature and Ca treatments was investigated in petri dishes with 10 ml of distilled water or with the appropriate saline solution. At 11 days after treatment, the highest germination rate was obtained at 20C with  H. syriacus  and 25C with  H. hamabo  without NaCl and Ca treatments. At 25C, only  H. hamabo  seeds germinated with 1% NaCl, with dry and fresh weight increasing as Ca concentration increased. With 0.5% NaCl treatment, the germination rate of  H. hamabo  and  H. syriacus  increased as Ca concentrations (0.0, 13.35, and 133.5 mM) increased. Without NaCl treatments, hypocotyl and leaf length and width of  H. syriacus  were longer than those of  H. hamabo ; with NaCl treatments, the inverse was true.

The Effects of Salinity on Hibiscus syriacus and H. hamabo Seed Germination