Effect of acid and alkali treatments on seed germination of two Nitraria with different storage ways

Effect of acid and alkali treatments were studied on seed germination of Nitraria tangutorum Bobr and N.sibirica Pall at different storage temperature and time.The results showed that N.tangutorum seeds which was stored at change-temperature,could promote after-ripening and break dormancy,and the seed vigor and germination percentage were improved obviously.Seed vigor and germination percentage of N.sibirica were 80% and 74.6% at room temperature(24~28 ℃),which was the highest in two years.When seeds were disposed by 70% H2SO4 and 0.5 mol/L NaOH,the initial germination time and the total days of seed germination were shorten obviously;When seeds were disposed by 0.5 mol/L NaOH and 70% H2SO4,seed germination rate was improved obviously and alkali treatment was better than acid treatment.