PEG6000渗透胁迫对藜幼苗叶片渗透调节物质的影响Effect of Osmotic Stress with PEG6000 on Osmotic Adjustment Solute in Seedling Leaves of Chenopodium album L.
孙存华;李扬;贺鸿雁;杜伟;金会丽;王东升;陈湘玲;徐新娜;
摘要(Abstract):
[目的]为了探讨藜的耐旱机理,为藜的人工栽培及推广提供理论依据和实践指导。[方法]藜幼苗长到六叶期时,浓度分别为0、5%、10%、20%的PEG6000进行渗透胁迫处理,分别处理01、、35、、7和9 d后从植株上部第3~5叶片功能叶片进行各项生理指标的测定。[结果]在5%PEG胁迫下,藜幼苗叶片的渗透调节物质含量缓慢增加,相对含水量(RWC)下降较小,在10%、20%PEG胁迫下,可溶性蛋白质、甜菜碱含量先升后降,RWC下降幅度较大。10%PEG胁迫的第5天藜幼苗叶片RWC降到62%,叶片开始萎焉;20%PEG胁迫的第3天RWC降到61.9%,叶片开始出现萎焉现象,第7天RWC降到48.6%,叶片干黄。5%、10%2、0%PEG胁迫到第7天时藜幼苗叶片脯氨酸含量分别是对照的7.64、10.92、9.4倍。[结论]藜对适度的渗透胁迫具有一定的适应性,但高浓度、长时间的PEG渗透胁迫会对藜造成严重损伤。
关键词(KeyWords): 藜;PEG;渗透胁迫;渗透调节物质
基金项目(Foundation): 江苏省教育厅自然科学基金(02KJD18007);; 江苏省生物资源重点实验室项目(KJS03042);; 徐州师范大学自然科学基金重点项目(06XLA11)
作者(Author): 孙存华;李扬;贺鸿雁;杜伟;金会丽;王东升;陈湘玲;徐新娜;
Email:
DOI: 10.13989/j.cnki.0517-6611.2007.25.053
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