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草业学报  2014 

铅胁迫对三种暖季型草坪草生长和生理特性的影响

DOI: 10.11686/cyxb20140421, PP. 171-180

Keywords: 铅胁迫,暖季型草坪草,抗性

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Abstract:

采用盆栽试验,研究了铅胁迫对假俭草、狗牙根与结缕草3种暖季型草坪草生长和生理特性的影响。通过向土壤中添加不同浓度的铅,研究铅积累对草坪外观质量、生物量、相对含水量、叶片电导率、叶绿素含量及抗氧化酶系统的影响。实验结果表明,随着铅胁迫浓度的增加,3种草坪草外观质量、根系生物量、相对含水量及叶绿素含量同对照相比均显著下降,地上部生物量下降幅度相对较小,而叶片中的电导率显著增加。不同浓度铅胁迫下,3种草内3种保护酶的反应程度不同。在各个铅胁迫水平下,假俭草叶片SOD活性逐渐升高,在20d时达到最大值;CAT活性自处理后5d时相比对照显著升高,此后基本维持在同一水平;而只有在2000和4000mg/kg铅胁迫水平下,POD活性显著升高,处理后25d时达到最大值。狗牙根在各胁迫水平下,SOD活性自处理后5d时均升高,25d时骤升至最大值;在15d时CAT活性达到最大值;POD活性均呈现上升趋势。结缕草叶片SOD活性在最高胁迫水平下处理5d后急剧升高,15d时达到最大值;POD活性均呈现先上升后降低的趋势,25d时达到最大值;CAT活性先升高后降低,在15d时达到最大值。对照3种草坪草对铅胁迫的响应变化具有差异,通过分析得出3种草坪草对铅抗性能力依次排序为:狗牙根>结缕草>假俭草。

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