Abstract: 1.The germination of ryegrass (Lolium perenne).wild barley (Hordeum brevisubulatum).brome grass (Bromus inermis).tall wheatgrass (Elytrigia elongatus) and alkaligrass (Puccinellia tenuiflora) under NaCl concentration: 0, 21, 66, 110, 150, 200, 267,334,445mmol/L NaCl were compared in a growth chamber experiment.As salt increased,germination rate, length of radical and shoot,weight of radical and shoot decreased.Thesalt tolerant order of five species is E.elongatus>B.inermis, P.tenuiflora>L.perenne>H.brevisubulatum.2.Seedlings of E.elongatus,B.inermis,L.perenne and H.brevisubulatum were grown at solution with salt concentration of 0, 200, 334, 445 mmol/L NaCl in aglasshouse experiment.The results showed that the aboveground biomass decreased withsalt increased at five weeks.Mean while sensitive of roots to salt stress decreased comparewith that in germination.E.elongatus has higher salt resistance among species.Decreasedosmotic potential by salt stress caused plants relative water depletion,then plants watercontents decreased.

Key words: Salt tolerance, Germination, Radical, Shoot

摘要： 在实验室对多年生黑麦草、野大麦、无芒雀麦、长穗偃麦草、碱茅种子在0、21、66、110、150、200、267、334、445mmol/LNaCl进行萌发试验。结果表明,除长穗偃麦草以外,种子发芽率随着盐度的增加而降低,胚根、胚芽长及鲜于重则随着盐浓度的增加而减少。种子发芽期耐盐性为长穗偃麦草>无芒雀麦、碱茅>多年生黑麦草>野大麦。在温室条件下,对多年生黑麦草、野大麦、无芒雀麦和长穗偃麦草在0、200、334、445mmol/LNaCl(对应的渗透势分别为0、-0.90、-1.95、-2.603MPa)中的幼苗生长进行研究。结果表明,五周龄时,盐胁迫使地上生物量呈线性降低,而根系生长对盐胁迫没有地上部敏感。以长穗偃麦草最耐盐,野大麦根系耐盐性较强。盐胁迫降低了溶液渗透势造成植物相对水分亏缺,地上部分含水量随着盐胁迫的增加而降低。

关键词: 耐盐性, 发芽, 胚根, 胚芽