Effects of salinity, light, and temperature on seed germination in a Turkish endangered halophyte, Kalidiopsis wagenitzii (Chenopodiaceae)


SEKMEN A. H. , OZDEMIR F., Turkan I.

ISRAEL JOURNAL OF PLANT SCIENCES, cilt.52, ss.21-30, 2004 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 52 Konu: 1
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1560/nxar-71fb-cnd5-e8fj
  • Dergi Adı: ISRAEL JOURNAL OF PLANT SCIENCES
  • Sayfa Sayıları: ss.21-30

Özet

Effects of salinity, light, and temperature oil the seed germination of an endangered, endemic halophyte, Kalidiopsis wagenitzii Aellen (Chenopodiaceae), were examined. Germination tests were carried Out at four salinity levels (0-400 mM) under various alternating temperature regimes and photoperiods. At 5-30 degreesC, percentage of germination was 99%, but at the highest temperature regime, 25-35 degreesC, percentage of germination was significantly inhibited. At 400 mM NaCl, few seeds germinated. While percentage of germination of K. wagenitzii seeds was greater in 24-h dark than in 12-h light/12-h dark treatment on salinities less than 200 mM NaCl, there were no differences between percentage germination in light- and dark-germinated seeds above 200 mM NaCl. Recovery of germination of K. wagenitzii seeds from NaCl salinity was studied under various temperature regimes and photoperiods. The percentage of ungerminated seeds that recovered when they were transferred to distilled water varied significantly with change in temperature regimes, but change in photoperiod did not significantly affect the rate of recovery germination of K. wagenitzii seeds. Although the highest temperature regime, 25-35 degreesC, inhibited germination of K. wagenitzii seeds, some recovery was also recorded at all salinity levels at this temperature regime. Rate of recovery germination and percentage recovery of germination increased with an increase in salinity levels. Final recovery germination percentages in high salt treatments were significantly higher than in other salt levels, indicating that exposure to high concentrations of NaCl did not permanently inhibit germination of K. wagenitzii seeds.