Effects of salinity, temperature, and light on seed germination in two Turkish endemic halophytes, Limonium iconicum and L. lilacinum (Plumbaginaceae)
Two perennial halophytic grasses, Limonium lilacinum (Boiss. and Bal.) Wagenitz and Limonium iconicum (Boiss. and Heldr.) O. Kuntze (Plumbaginaceae), are endemic to Turkey. Their seed germination responses were investigated at six salinities (0, 100, 200, 300, 400, and 500 mM NaCl) under three temperature regimes (10/20, 15/25, and 20/30°C), both in a 12 h photoperiod and in complete dark. The highest germination (91-99%) in both species was obtained in the distilled water controls at 15/25 and 20/30°C in the light. An increase in salinity resulted in a rapid decrease in germination. Generally, germination was mostly below 20% at 300 mM NaCl and above. The lower thermoperiod (10/20°C) considerably inhibited the germination of L. iconicum and L. lilacinum seeds in both saline and non-saline treatments. There was a significant difference (P < 0.05) between light and dark conditions for all temperature treatments. That is, light promoted germination in both Limonium species. The rate of germination increased with an increase in temperature and decreased with increasing salinity.
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Document Type: Research Article
Publication date: October 1, 2008
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