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草地学报  2014 

不同种子处理方法对柳枝稷萌发成苗需水阈值的影响

DOI: 10.11733/j.issn.1007-0435.2014.03.027, PP. 617-622

Keywords: 柳枝稷,种子处理,水分胁迫,耐旱性,需水阈值

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Abstract:

研究柳枝稷(Panicumvirgatum)成苗期间的抗旱性及需水特性,可为其在干旱条件下播种保苗提供依据。采用不同浓度的聚乙二醇(-0.1~-0.5MPa)模拟外界环境水分条件,用4℃低温冷冻化和8M硫酸处理3个柳枝稷品种(Pathfinder,Traiblazer和Alamo)的种子,研究其成苗过程中种子萌动、萌发和出苗3个阶段的需水阈值。结果表明随着环境水势的降低,种子群体萌动、萌发和出苗达50%概率的时间逐渐延迟;且各阶段的需水阈值不同,出苗阶段的最低。4℃低温冷冻化处理和8M硫酸处理均使种子群体萌动、萌发和出苗达50%的时间缩短,各阶段需水阈值增大。在相同处理下,Pathfinder品种各阶段对环境水势的需求较Trailblazer和Alamo宽松。可见,柳枝稷种子出苗阶段对环境水分胁迫最为敏感,忍受胁迫能力最弱,抗旱性最弱;其中Pathfinder品种忍受胁迫能力最强,抗旱性最强。

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