Response of Halocnermum strobilaceum to light, temperature,salt and drought stresses during seed germination
The effects of light,temperature,NaCl and PEG-6000 on seeds germination of Halocnermum strobilaceum were estimated.The optimal conditions of temperature and light for seeds germination of H.strobilaceum was 30 ℃,dark for 12 h/35 ℃,light for 12 h which had germination rate of 99％.Low concentrations of NaCl (0～300 mmol · L-1) did not inhibit seed germination,while medium or high concentrations of NaCl (400 ～ 700 mmol · L-1) significantly inhibited (P ＜ 0.05) seed germination whose effects increased with the increase of NaCl concentrations.The threshold and limit values of NaCl tolerance in H.strobilaceum seed were 470.47 and 829.30 mmol · L-1,respectively.High osmotic potentials of PEG (-0.4～0.0 MPa) did not inhibit seed germination,while medium or low osmotic potentials of PEG (-1.4～0.6 MPa) significantly inhibited (P＜0.05) seed germination whose effects increased with the decrease of osmotic potentials.The threshold and limit values of PEG tolerance in H.strobilaceum seed were-0.75 and-1.46 MPa,respectively.All of these results suggested that H.strobilaceum seed had higher salt and tolerance at germination stage.
Halocnermum strobilaceumtemperaturelightNaCl stressPEG stressgermination characteristics of seed
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万方数据
维普
