4个匍匐翦股颖品种种子萌发期耐盐性评价

Salt tolerance evaluation of four creeping bentgrassvarieties at seed germination stage

摘要:

以4个匍匐翦股颖品种(羚羊、克罗米、旅星、A-1)为材料,用不同浓度NaCl溶液(0、20、60、120、180、240、300 mmol/L)模拟盐胁迫,测定4个品种的发芽率、发芽势、发芽指数、活力指数等11个生长指标,分析不同盐胁迫程度下种子的萌发过程及生长形态指标的变化,并用隶属函数法对4个品种的耐盐性进行了综合评价。结果表明:低浓度的盐胁迫对匍匐翦股颖种子萌发有一定的促进作用,超过一定盐浓度范围后,随着盐浓度的升高,NaCl胁迫对种子的萌发及生长产生明显的抑制作用,各生长指标随着盐浓度的增大呈下降趋势,当盐浓度为240、300 mmol/L时,种子几乎不萌发;不同品种的匍匐翦股颖种子萌发时对盐胁迫的响应程度不同,其中,羚羊和旅星耐盐性最好,克罗米和A-1耐盐性较差,综合评价耐盐性由强到弱依次为旅星＞羚羊＞克罗米＞A-1。

Abstract:

Four creeping bentgrass cultivars (Impala,Kromi BT,Travel Star,Pen-1) were used to evaluate their salt tolerance at germination stage under NaCl stress (0,20,60,120,180,240 and 300 mmol/L).11 growth indices,including germination rate,germination potential,germination index and vigor index,the germination process and morphological changes of seeds,were measured.The salt tolerance of 4 cultivars was evaluated comprehensively by membership function method.The results showed that the low concentration of NaCl solution promoted the germination.When the NaCl concentration exceeded a certain range,NaCl stress significantly inhibited the germination and growth.With the increase of salt concentration,each growth index showed a decreasing trend.When the salt concentration was 240 to 300 mmol/L,the seeds hardly germinated.The response degree of creeping bentgrass seed germination to salt stress was different among tested cultivars.In which,Impala and Travel Star performed best,while Kromi BT and Pen-1 worst.The order of salt tolerance was Travel Star＞Impala＞Kromi BT＞Pen-1.