摘要
【目的】克隆甘蔗的苯丙氨酸解氨酶基因(PAL),分析其序列特征及其在不同组织和5种胁迫条件下的表达情况,为此基因在甘蔗抗逆育种中的应用提供理论支撑。【方法】利用串联飞行时间质谱仪对差异表达蛋白质进行质谱鉴定分析,通过RT-PCR和RACE技术从甘蔗品种新台糖22号(ROC22)中克隆PAL,以生物信息学方法对其序列进行预测分析,利用real-time PCR分析PAL在不同组织和不同胁迫条件下的表达特性。【结果】克隆获得甘蔗PAL,命名为ScPAL,GenBank登录号为KC172559。该cDNA全长2 590 bp,含有1个2 115 bp的完整开放阅读框(ORF),编码704个氨基酸。序列分析表明,其包含典型的PAL酶活性中心序列(GTITASGDLVPLSYIA),与其它植物的PAL蛋白有很高的相似性。系统进化树分析显示,甘蔗ScPAL与高粱的PAL蛋白亲缘关系较近。real-time PCR分析表明PAL为组成型表达,在根中的表达量最高,是叶中表达量的66倍。其在低温(4℃)、聚乙二醇(PEG)、NaCl和H2O2四种外源胁迫下均诱导表达,但表达模式不同。【结论】从甘蔗品种ROC22中克隆获得苯丙氨酸解氨酶基因(ScPAL),是典型的PAL家族成员,推测其参与了甘蔗抗黑穗病过程,且在甘蔗抗寒、抗旱和抗盐胁迫过程也起到某种作用。
[ Objective ] The aim of this study was to clone full-length cDNA of sugarcane phenylalanin ammonia-lyase （PAL） gene （ScPAL）, a key enzyme gene related to phenylpropanoid metabolism in sugarcane, investigate its sequence characteristics, analyze its expressions in different organs and under five different stress conditions, thus providing a theoretical support for using this gene in sugarcane stress tolerance breedi.g. [Method] The differentially expressed protein was identified by MALDI TOF/TOF and analyzed using Applied Biosystems GPS Explorer software with Mascot analysis against the NCBI and Uniprot database using a combined peptide mass fingerprint and MS/MS search, then the full sequence of ScPAL was cloned from sugarcane variety ROC22 using RT-PCR and RACE techniques. The bioinformatics method was used to analyze the putative amino acidsequence, and real-time PCR method was used to analyze the expression of ScPAL in different tissues and under different stresses. [Result] The full-length cDNA of SEPAL （GenBank accession number： KC172559） in sugarcane was cloned. The sequence consists of 2590 bp with an intact open reading frame of 2115 bp, encoding a polypeptide of 704 amino acids. Sequence analysis showed that it contains the typical PAL enzyme active site sequence （GTITASGDLVPLSYIA）. Homology analysis showed that the deduced ScPAL protein was highly homologous to other PAL proteins from different species. Phylogenetic tree analysis indicated that ScPAL was very closely related to PAL of sorghum. Real-time PCR results showed that the ScPAL expressed in root, stalk and leaf, respectively, and its expression was different among three organs. The mRNA of SEPAL in root was the highest among three organs and was about sixty-six times higher than that in leaf. Furthermore, SEPAL transcription level was induced under the treatment of low temperature, PEG, NaC1 and H202 stresses, but the expression patterns were different. [ Conclusion ] The gene SEPAL which was firstly cloned and characterized
出处
《中国农业科学》
CAS
CSCD
北大核心
2013年第14期2856-2868,共13页
Scientia Agricultura Sinica
基金
国家“863”计划课题(2013AA102604)
国家国际合作项目(2013DFA31600)
广西科学研究与技术开发计划项目(桂科产1123008-1,桂科攻1222009)
自治区主席科技资金项目(11166-02)
