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草地学报  2015 

干旱胁迫下偏关苜蓿显微结构响应特征研究

DOI: 10.11733/j.issn.1007-0435.2015.04.016, PP. 771-779

Keywords: 偏关苜蓿,干旱胁迫,显微结构,响应率,响应度

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Abstract:

以山西地方优良种质——偏关苜蓿(Medicagosativa‘Pianguan’)为材料,采用20%PEG模拟干旱胁迫0,24,48,72h后,观测根、茎、叶各器官显微结构特征参数。利用单位干旱时间内各显微结构参数相对响应关系及干旱时间与干旱指标实测值关系,获取能够在显微结构尺度上定量评价植物体各组织对干旱胁迫响应关系的干旱指数干旱响应率(RR)和干旱响应度(RD),旨在为干旱胁迫与细胞响应的其他相关研究提供方法学参考。结果表明叶片海绵组织厚度和栅栏组织厚度、茎韧皮部厚度和筛管直径及髓腔直径、根直径和表皮厚度分别对干旱胁迫有相对较高的响应特征,其中叶片海绵组织厚度、栅栏组织厚度和茎髓腔直径的响应特征最高。综合响应率和响应度分析得出各器官对PEG的耐受性依次为根>茎>叶。

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