Effects of Saline-alkaloid Stress on the Seed Germination and Seedling Growth of Three Smooth Brome Varieties

In order to discuss the saline-alkaloid-resistant ability of smooth brome,different concentration of saline-alkaloid liquor(0,20,40,60,80,100,120 mmol·L-1)mixed with NaCl,Na2SO4,NaHCO3 and Na2CO3 were used in smooth brome seed germination process.The effects of different concentration saline-alkaloid stress on the seed germination and seedling growth of three smooth brome varieties were studied.The results showed that low concentration of saline-alkaloid stress improved seed germination ability of mancher,and the other two varieties performing for the inhibition.When the saline-alkaloid concentration was under 60 mmol·L-1,the germination rate,germination index,vigor index and seedling growth were not significant(P0.05);While the saline-alkaloid concentration was exceed 60 mmol·L-1,all indexes fell sharply,and very significant difference compared to that of the control(P0.01).When the saline-alkaloid concentration was more than 20 mmol·L-1,the growth of seedling of three smooth brome varieties were inhibited,inhibition of root was higher than seedling inhibitory.