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科学通报  2011 

渗透胁迫诱导的玉米叶片电信号功率谱的变化

, PP. 2827-2834

Keywords: 植物电信号,功率谱分析,渗透胁迫,玉米

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Abstract:

为了定量描述植物电信号功率谱特征及其变化,定义了植物电信号边缘频率(SEF)、重心频率(SCF)、功率指数(PI)和功率谱熵(PSE)并给出了计算方法,研究了渗透胁迫下玉米叶片电信号功率谱的变化.结果表明,正常生长的玉米叶片电信号的SEF约为0.2Hz,SCF约为0.1Hz,叶片电信号主要为0~0.1Hz的慢波;在渗透胁迫2h时,玉米叶片电信号的SEF和SCF向高频段移动,0.1~0.2Hz的快波比重升高,细胞活动受到激发,与此同时,PSE急剧增加,讨论了渗透胁迫诱导的叶片电信号SCF和PSE升高的原因.研究还发现,在渗透胁迫过程中,PSE与SCF的变化之间有很强的关联性,认为植物电信号功率谱PSE或SCF的变化可以作为渗透胁迫下叶片细胞开始对水分亏缺实施调控的灵敏信号,通过对PSE或SCF的测量可以实现对植物需水状况的早期预警和诊断.

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