Abstract:
Halimodendron halodendron(Pall.) Voss seed introduced in Hohhot was used as the research material.Different concentrations of NaCl solution(4 g·L
-1,8 g·L
-1,12 g·L
-1,16 g·L
-1,20 g·L
-1) and PEG-6000 solution(5%,10%,15%,20%,25%) were set to simulate the salt and drought stress to explore the germination characteristics of the Halimodendron halodendron(Pall.) Voss seed under salt and drought stress,in order to provide a reference for Halimodendron halodendron(Pall.) Voss to improve saline-alkali soil and ecological restoration in arid and semi-arid areas.The results showed that,with the increase of salt stress degree,the seed germination rate and germination potential of Halimodendron halodendron(Pall.) Voss showed a trend of first increased and then decreased;the germination index,vigor index,length of radicle and plumule decreased with the increase of NaCl concentration.Under drought stress,all indexes decreased with the increase of PEG-6000 solution concentration,and low concentration(5%) of PEG-6000 solution had no significant inhibitory effect on seed germination.When the concentration of NaCl and PEG-6000 solutions were 20 g·L
-1 and 25%,the seed germination rate of Halimodendron halodendron(Pall.) Voss was 54.67% and 25.33% which did not reach the threshold of salt and drought for germination.