萝卜硝酸还原酶基因的克隆与表达分析

[目的]为揭示萝卜(Raphanus sativus L.)硝酸还原酶基因(RsNR)的分子特征,降低硝酸盐含量,对萝卜RsNR基因进行分离与表达特性研究。[方法]基于本实验室转录组测序所得unigene序列分离RsNR基因cDNA,利用生物信息学方法进行序列分析,采用RT-qPCR方法对不同浓度KNO3(0、5、20、30和50mmol·L^-1)和不同时间(0、4、8、12和24h)处理的萝卜中RsNR基因表达进行检测,并测定硝酸盐含量和硝酸还原酶活性(NRA)。[结果]获得萝卜RsNR基因cDNA序列(GenBank登录号:KM272859),开放阅读框为2742bp,编码913个氨基酸...

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Published in南京农业大学学报 Vol. 38; no. 2; pp. 205 - 211
Main Author 武悦 徐良 王娟娟 龚义勤 谢洋 柳李旺
Format Journal Article
LanguageChinese
Published 2015
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Summary:[目的]为揭示萝卜(Raphanus sativus L.)硝酸还原酶基因(RsNR)的分子特征,降低硝酸盐含量,对萝卜RsNR基因进行分离与表达特性研究。[方法]基于本实验室转录组测序所得unigene序列分离RsNR基因cDNA,利用生物信息学方法进行序列分析,采用RT-qPCR方法对不同浓度KNO3(0、5、20、30和50mmol·L^-1)和不同时间(0、4、8、12和24h)处理的萝卜中RsNR基因表达进行检测,并测定硝酸盐含量和硝酸还原酶活性(NRA)。[结果]获得萝卜RsNR基因cDNA序列(GenBank登录号:KM272859),开放阅读框为2742bp,编码913个氨基酸,RsNR与油菜NR基因(D38219)氨基酸序列相似性为95%。在30mmol·L^-1NO3^--N诱导下,萝卜叶片和根中RsNR基因表达量最高。在30mmol·L^-1NO3^--N诱导初期,叶片和根中RsNR表达量4h达到最大值,随后呈下降趋势;随着硝酸盐处理浓度升高,NRA、硝酸盐含量和RsNR基因表达量均呈先升后降趋势,0~4h内叶片和根中三者均上升,4~24h内NRA和RsNR基因表达下降,而硝酸盐含量呈上升趋势。[结论]NO3^--N可能在转录水平上调控萝卜RsNR基因表达,进而影响其硝酸盐含量和NRA。
Bibliography:[Objectives]To characterize the nitrate reductase gene and reduce the nitrate content,the isolation and expression profiling of nitrate reductase gene(Rs NR) in radish(Raphanus sativus L.) was conducted.[Methods]Based on the unigene sequence from transcriptome database,the c DNA of Rs NR was isolated.Bioinformatics methods were used for sequence analysis.The expression of Rs NR in radish plants treated with different KNO3 concentrations(0,5,20,30 and 50mmol·L^-1) and time periods(0,4,8,12 and 24h) were detected using RT-q PCR,and the nitrate content and nitrate reductase activity of radish plants were determined.[Results]The c DNA sequence of Rs NR gene was isolated containing an open reading frame(ORF) of 2 742 bp(Gen Bank accession No.: KM272859).The deduced 913 amino acids sequence showed a 95% identity with NR gene(D38219) in Brassica napus.The maximum Rs NR expression level in leaf and root was induced by 30mmol·L^-1NO3^--N.In a short-term induction of 30 mmol·L^-1NO3^--N,the expression level of Rs NR re
ISSN:1000-2030