Effects of NaCl Stress on Seeds Germination and Seedling Growth of Celery Varieties

Taking ‘Jingqinyihao',‘Boke',‘Jiazhouwang',‘Ribenxiaoxiangqin',‘Xiaqin' five celery varieties as materials,the effects of NaCl stress(0,30,60,90,120mmol/L NaCl)on germination and seedling growth stage were studied.The results showed that the seed germination and seedling growth were inhabited,promoted/inhabited as the salt concentration increased.Moreover,NaCl stress(30mmol/L)had beneficial effect on germination and seedling growth.The response of index exhibited significant differences on relative salt damage rate.The most sensitive index were vigor index(VI),radical length(RL),hypocotyl length(HL),fresh weight(FW)and dry weight(DW)and the least sensitive index were seed germination percentage(GP),germination energy(GE)and germination index(GI).According to the comprehensive salt damage rate,‘Boke'and‘Xiaqin'were the most resistant,and‘Jingqinyihao'and‘Xiaoxiangqin' were the most sensitive varieties at germination stage and early seedling growth.