赤霉素对盐害下碱茅的萌发和幼苗生长的影响  

Effect of Gibberellinon the Seed Germination and Seedling Growth of Puccinellia distans Under Salt-stress

作　　者：孙彬[1] 陈为峰 

机构地区：[1]山东农业大学资源与环境学院,山东泰安271000

出　　处：《水土保持研究》2014年第6期30-34,共5页Research of Soil and Water Conservation

基　　金：国家环保公益性行业科研专项任务(200809047);山东省中青年科学家科研奖励基金(2007BSB08007)

摘　　要：以碱茅为试材，在100mmol／L的NaCI盐胁迫下，通过种子培养、室内盆栽试验，研究盐胁迫下不同浓度赤霉素（8，15，20，25，50mg／L）对碱茅种子萌发、幼苗生长的影响。结果表明：（1）100mmol／L的NaCl严重抑制碱茅的种子萌发和幼苗生长，碱茅种子的发芽率、发芽势和发芽指数、根茎长显著降低，根系活力、过氧化物酶活力受到严重抑制；（2）在外源赤霉素溶液为8～20mg／L的范围内，随着浓度的升高，碱茅种子的发芽率、发芽势和发芽指数、根茎长逐渐升高，根系活力、过氧化物酶活力、耐盐指数明显提高；（3）高浓度（〉20mg／L）的外源赤霉素浸种处理，对种子的促进作用逐渐下降，当赤霉素浓度为50mg／L时，碱茅的发芽率和根茎比低于对照，产生了抑制效应。结论：不同浓度赤霉素对提高碱茅种子耐盐性有不同程度的促进作用，以赤霉素浓度为20mg／L时作用效果最佳。The Puccinellia distans seeds were treated with different gibberellin concentrations （8,15,20,25, 50 mg/L） under the NaCl salt stress （100 mmol/L）in analogue experiments so as to study the influence on their seed germination and seedling growth. The results showed that： （1） 100 mmol/L NaCl significantly in- hibited the seed germination and seedling growth, germination percentage, germination energy, germination index, root length and grass height significantly reduced, root activity, peroxidase activity and index of salin- ity tolerance were significantly inhibited, too; （2） during the range of 8～20 mg/L all the index data were improved; （3） but the promoting effect had fallen obviously when the the concentration of gibberellin is more than 20 mg/L. When the concentration of gibberellin is 50 mg/L, the seed germination and the ratio of Puc- cinellia distans roots and stems were lower than control sample, depression effect of gibberellin was obvious. Therefore, different concentrations of gibberellin have different promoting effects. The best promoting effect of gibberellin was found at the concentration of 20 mg/L.

关 键 词：草业科学 盐胁迫 碱茅 赤霉素 抗盐性 

分 类 号：S143.8[农业科学—肥料学]