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棉花学报  2014 

NaCl胁迫对棉花叶片衰老特征的影响及其生理学机制

DOI: 1002-7807（2014）01-0066-07, PP. 66-72

Keywords: 棉花,NaCl胁迫,衰老,激素

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Abstract:

以叶片衰老快慢不同的两个棉花品系L21和L22为材料，研究了NaCl胁迫对棉花叶片衰老的影响及其相应的生理学机制。温室内水培棉苗，待第5片真叶展开20d后用含125mmol·L-1NaCl的营养液处理棉苗，以不含NaCl的营养液处理为对照。结果显示，NaCl胁迫下L21和L22叶片中叶绿素含量和光合作用速率下降，叶片和根中的Na+含量上升、K+含量降低；NaCl胁迫还增加了棉株体内脱落酸（ABA）含量、降低了玉米素核苷（ZR）含量。表明K+含量降低以及ABA含量升高、ZR含量下降是NaCl胁迫促进棉花叶片衰老的重要原因。

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