WANG Ying,XU Dong-mei.Study on Drought Resistance of Five Kinds of Forage Grasses During Seed Germination Period Under PEG Stress[J].Northern Horticulture,2015,39(12):54-58.[doi:10.11937/bfyy.201512016]
PEG胁迫下五种禾本科牧草种子萌发期抗旱性研究
- Title:
- Study on Drought Resistance of Five Kinds of Forage Grasses During Seed Germination Period Under PEG Stress
- 文章编号:
- 1001-0009（2015）12-0054-05
- Keywords:
- PEG; seed germination; drought resistance
- 分类号:
- S 543
- 文献标志码:
- A
- 摘要:
- 以沙生冰草、蒙古冰草、蒙农杂种冰草、新麦草和无芒雀麦5种禾本科牧草的种子为试材，采用-0.3、-0.6、-0.9、-1.2 MPa不同浓度的PEG6 ?000溶液模拟干旱胁迫，研究种子萌发期的相对发芽率、相对发芽势、胚根胚芽比、简化活力指数和萌发指数，并采用隶属函数法对干旱胁迫下5种禾本科牧草种子萌发期抗旱性行了综合评价。结果表明：低浓度的PEG（-0.3 MPa）对蒙古冰草、蒙农杂种冰草的萌发有明显的促进作用；根据胚根胚芽比、简化活力指数和萌发指数均值的分析，-0.6 MPa水势可能是禾本科牧草种子萌发的抗旱临界水势；抗旱性排序为无芒雀麦>蒙农杂种冰草>蒙古冰草>沙生冰草>新麦草。
- Abstract:
- The seeds of five kinds of forage grasses which included Agropyron desertorum，Agropyron mongolicum，A.gropyon cristatum×A.desertorum?cv.Hycrest Mengnong，Psathyrostachys juncea (Fisch.) Nevski and Bromus inermis Leyss were selected and germinated under different drought stress conditions by simulating with different concentrations of PEG6000(-0.3 MPa,-0.6 MPa,-0.9 MPa,-1.2 MPa).The relative germination percentage，relative germination rate，radicle germ ratio，simplified vigor index and germination index were determined.The results showed that,the low concentration of PEG (-0.3 MPa) significantly promoted seed germination of Agropyron mongolicum and A.gropyon cristatum×A.desertorum cv.Hycrest Mengnong.According to average values of radicle germ ratio，simplified vigor index and germination index,-0.6 MPa water potential may be the critical value for drought resistance of the forage grasses.The drought resistances of the five forage grasses were comprehensively evaluated by using membership function.The evaluation value of the five kinds of forage grasses from high to low were Bromus inermis Leyss, Agropyron mongolicum，Agropyon cristatum×A.desertorum cv.Hycrest Mengnong, Agropyron desertorum and Psathyrostachys?juncea (Fisch.) Nevski.
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备注/Memo
第一作者简介： 王莹（1991-），女，河南新蔡人，硕士研究生，研究方向为牧草种质资源。E-mail：1252650816@qq.com.责任作者： 许冬梅（1970-），女，宁夏中卫人，博士，教授，硕士生导师，现主要从事草地生态与管理等研究工作。E-mail：nxxudongmei@163.com.基金项目： 国家林业公益性行业科研专项资助项目（201304311）。