OALib Journal期刊
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二年生三七中黄酮含量对砷胁迫的响应及其酶学机理
DOI: 10.3724/SP.J.1145.2014.04034, PP. 1005-1010
Keywords: 三七,黄酮,砷,苯丙氨酸解氨酶,查尔酮合酶
Abstract:
为了向三七[panaxnotoginseng(burk.)f.h.chen]生产及品质保障提供理论和实践依据,采用大田试验和室内分析相结合的方法,研究不同的砷(as)浓度[as(v):0、20、80、140、200和260mgkg-1,na3aso4配制]处理对二年生三七不同部位(主根、须根、剪口)as含量和黄酮含量的影响,探讨三七黄酮代谢关键酶苯丙氨酸解氨酶和查尔酮合酶活性对as胁迫的响应.结果表明:(1)三七黄酮含量与as含量的分布规律一致:须根>剪口>主根.各部位as含量与as处理浓度之间呈显著的正相关(p<0.01).各部位中黄酮含量与as含量、as处理浓度之间显著的负相关性与生长时期有关.(2)除在as处理浓度80-260mgkg-1时,须根中as含量超过1mgkg-1外,各部位as含量均符合优质三七as的限量标准(≤2.0mgkg-1).在开花期和成熟期三七黄酮含量大于生长期,as处理浓度为260mgkg-1时,三七剪口、主根和须根中黄酮含量比对照分别降低5.30%-11.51%、6.42%-12.93%和4.33%-12.36%.(3)as处理浓度≤200mgkg-1时,剪口和主根中苯丙氨酸解氨酶和查尔酮合酶的活性没有显著的变化,须根中查尔酮合酶活性提高,苯丙氨酸解氨酶活性降低.在as处理浓度为260mgkg-1时,三七剪口、主根和须根中苯丙氨酸解氨酶和查尔酮合酶活性显著下降.总之,三七剪口、主根和须根中黄酮的含量对as胁迫的响应与as胁迫浓度、生长时期和部位有关,其中,须根最敏感,三七黄酮含量及其关键酶活性能够在as处理浓度为200mgkg-1范围内维持一定的抗性.
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