不同多花黑麦草品种萌发期耐盐性评价

采用0、23.4、35.1、46.8和58.5 mol/L NaCl溶液对24个多花黑麦草(Lolium multiflourum)品种种子进行处理，测定了发芽率、生长状况和叶片含水量。结果表明，随着盐浓度的增加，相对发芽率、相对幼苗和相对根长、相对生物量和相对叶片含水量呈下降趋势，且23.4 mol/L NaCl 溶液处理下的各指标值显著高于46.8和58.5 mol/L处理（P<0.05）。盐胁迫对参试材料相对根长的影响最大，其次是相对苗长，对相对叶片含水量影响最小。盐胁迫下各材料间的相对根长和相对生物量差异较明显。综合评价24个种质材料耐盐性，耐盐材料为LM05、LM07、LM10、LM20和LM23，盐敏感材料为LM03、LM08、LM09和LM16。

Evaluation of salt tolerance of Italian ryegrass at the germinating period

24 varieties seeds of Italian ryegrass(Lolium multiflourum) were soaked in 0,23.4,35.1,46.8,58.5 mol/L NaCl solution to evaluate their salt tolerance by measuring germination,growth,water content of leaf.The results of this study showed the relative germination percentage,relative seedling length,relative root length,relative biomass and relative water content of leaf decreased as the NaCl concentration of solution increased and indexes of the accessions in 23.4 mol/L NaCl solution were significantly higher those in 46.8 and 58.5 mol/L NaCl solution(P<0.05).Effect of salt stress on parameters of L.multiflourum was in order,the relative root length>the relative seedling length>the relative water content of leaf.The remarkable differences in the relative root length and relative biomass under salt stress were found among 24 varieties.Comprehensive evaluation results showed that LM05,LM07,LM10,LM20 and LM23 was strong salt tolerance group and LM03,LM08,LM09 and LM16 was sensitive group to salt.