摘 要:镉不是植物生长所必需的的营养元素,但易被植物吸收,过量的镉会对植物产生毒害,并通过食物链进入人体,引发多种疾病。研究表明,水稻和拟南芥Fruit weight 2。2-like (FWL)基因OsPCR1和AtPCR1在植物镉胁迫抗性中发挥重要作用,而水稻中其他FWL基因响应镉胁迫的分子功能还不清楚。本课题通过分析水稻FWL基因不同浓度镉处理下的表达模式,探究其在镉胁迫响应中的分子功能。结果表明,OsFWL1、OsFWL2、OsFWL3和OsFWL6基因不同浓度镉处理下在根和叶中的相对表达量均无显著差异,而OsFWL4在100μM镉处理的根中表达量显著上调,OsFWL7仅在根中有表达并在50μM和100μM镉处理下被显著诱导。这些结果表明,OsFWL4和OsFWL7可能在镉胁迫应答中发挥功能。95034
毕业论文关键词:水稻;FWL基因;镉胁迫;表达分析
Abstract: Cadmium is not the necessary nutrient for plant growth, but is easily absorbed by plants。 Excessive cadmium can poison the plants and enters the human body through the food chain and finally causes a variety of diseases。 Some studies have shown that the rice and Arabidopsis fruit weight 2。2-like (FWL) genes OsPCR1 and AtPCR1 play an important role in plant cadmium stress resistance, but the functions of other rice FWL genes in cadmium stress response remain illusive。 In this study, the molecular function of rice FWL genes in cadmium stress response was investigated by analyzing the expression patterns of these genes under treatments of cadmium in different concentrations。 No significant difference in relative expression levels of OsFWL1, OsFWL2, OsFWL3 and OsFWL6 genes in both roots and leaves under treatments of different concentrations of cadmium was detected, while OsFWL4 was found to be significantly up-regulated by 100 μM cadmium in roots and OsFWL7 was specifically expressed in roots and was significantly induced by 50 and 100 μM cadmium。 These results suggest that OsFWL4 and OsFWL7 may function in cadmium stress response。
Key words: rice; FWL gene; cadmium stress; expression analysis
目 录
1 前言 5
2 材料与方法 6
2。1材料与处理 6
2。2总RNA提取 6
2。2。1实验试剂 6
2。2。2操作步骤 7
2。3反转录 7
2。3。1实验试剂 7
2。3。2操作步骤 7
2。4荧光定量PCR检测 8
2。4。1实验样品 8
2。4。2实时定量PCR试验材料及仪器 8
2。4。3 PCR反应步骤 8
2。5数据分析 8
3 结果与分析 9
3。1总RNA的提取与反转录 9
3。2镉处理样品荧光定量PCR分析 10
讨论 12
参 考 文 献 13
致 谢 14
1 前言源C于H优J尔W论R文M网WwW.youeRw.com 原文+QQ752-018766
水稻是世界三大主要粮食作物之一,也是亚洲最重要的粮食来源。由于现代人类活动的影响,致使水稻中重金属含量增多,尤其是镉(Cd)含量严重超标[1]。镉是一种有毒的重金属,主要通过食物链进入人体,对人类的健康产生危害[2]。镉污染具有一定的隐蔽性且会导致一些慢性中毒和癌症[3]。当前,中国重工业的发展以及农民的耕作习惯使重金属污染有可能会取代农药,成为危及粮食安全的第二潜在杀手[4]。相对其他植物而言,水稻吸收并积累镉的能力相对较强。