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作物学报 ›› 2011, Vol. 37 ›› Issue (10): 1801-1808.doi: 10.3724/SP.J.1006.2011.01801

• 作物遗传育种·种质资源·分子遗传学 • 上一篇    下一篇

籽粒苋C4型磷酸烯醇式丙酮酸羧化酶基因的克隆和表达分析

冯瑞云1,2，白云凤2,**，李平3，张维锋2,*，王媛媛1，杨武德1,*   

  1. 1 山西农业大学农学院，山西太谷 030801；2 山西省农业科学院作物科学研究所，太原 030031；3 山西大学生物工程学院，山西太原 030006
  • 收稿日期:2011-03-23 修回日期:2011-06-25 出版日期:2011-10-12 网络出版日期:2011-07-28
  • 通讯作者: 张维锋, E-mail: zhwfen@sina.com; 杨武德, E-mail: sxauywd@126.com
  • 基金资助:

    本研究由国家自然科学基金项目(30971838), 山西省回国留学人员基金项目(200986)和山西省国际科技合作项目(2011081005)资助。

Molecular Cloning and Expression Analysis of C4 Phosphoenolpyruvate Carboxylase Gene from A. hypochondriacus L.

FENG Rui-Yun1,2,BAI Yun-Feng2,**,LI Ping3,ZHANG Wei-Feng2,*,WANG Yuan-Yuan1,YANG Wu-De1,*   

  1. 1 College of Agronomy, Shanxi Agricultural University, Taigu 030801, China; 2 Institute of Crop Sciences, Shanxi Academy of Agricultural Sciences, Taiyuan 030032, China; 3 Bio-engineering School of Shanxi University, Taiyuan 030006, China
  • Received:2011-03-23 Revised:2011-06-25 Published:2011-10-12 Published online:2011-07-28
  • Contact: 张维锋, E-mail: zhwfen@sina.com; 杨武德, E-mail: sxauywd@126.com

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被引次数

10

摘要： 磷酸烯醇式丙酮酸羧化酶(phosphoenolpyruvate carboxylase, PEPC)是C4途径的关键酶之一。本研究克隆了双子叶植物籽粒苋(A. hypochondriacus L) C4型PEPC基因的cDNA和gDNA全长序列。该基因编码区cDNA全长2 895 bp (GenBank Accession: HQ186302)，编码964个氨基酸残基。对应的gDNA全长为6 785 bp，含10个外显子和9个内含子，内含子总长3 890 bp，其中第一内含子最长，为1 662 bp，具GATA-motif、G-box等15个光应答元件，9个激素应答元件，29个CAAT box，72个TATA box。该特征在本研究范围内的植物中，为籽粒苋所独有。比较多种植物表明，不同植物之间的C3/C4型PEPC基因的外显子长度具有较高的一致性，而内含子的长度变化较大。不同植物PEPC基因对核苷酸具有一定的选择性，并且外显子和内含子的GC含量呈正相关。总的趋势是单子叶植物外显子和内含子的GC含量均高于双子叶植物。利用半定量RT-PCR分析表达模式，发现籽粒苋PEPC基因主要在叶片中表达，表达量随光照时间延长而增加。

关键词: 籽粒苋(A. hypochondriacus L), C4光合途径, 磷酸烯醇式丙酮酸羧化酶, 基因组序列, 叶片特异性, 光诱导表达

Abstract: Phosphoenolpyruvate carboxylase (PEPC) plays a crucial role in primarily fixing atmospheric CO2 in C4 and CAM plants. This paper aimed at cloning both cDNA and genomic DNA of PEPC gene from Amarnthus hypochondriacus in order to provide candidate genes for C4 genetic engineering. The cDNA was cloned by RT-PCR, and the corresponding gDNA was cloned by LA-PCR. The sequence characteristics were analyzed using bioinformatics softwares including Blast, ClustalX (1.8), DNAMAN, PlantCARE. The gene expression pattern was analyzed by using semi-quantitative RT-PCR. The results indicated that the cDNA with the complete coding region was 2 895 bp in length which encoded 964 putative amino acids. The amino acid at site 774 was the serine that is an invariant residue in all C4 phosphoenolpyruvate carboxylases regardless of their taxonomic. The corresponding gDNA was 6 785 bp in length which harbored ten exoned and nine introns. The longest intron was the first intron with 1 662 bp in length. A computer scan disclosed that the first intron harbored 15 light-induced elements, nine hormone-induced elements, 29 TAAT motifs and 72 TATA motifs.In comparisons of PEPC genes between different species the exons are usually conserved but the introns have often diverged in both nucleotide sequences and lengths. The GC ratios of exons are positively correlated with those of introns in PEPC genes from different species. And the GC ratios of PEPC gene in dicotyledon A. hypochondriacus, potato, A. thaliana and ice plant are lower than those in monocotyledon maize, rice and wheat. The semi-quantitative RT-PCR analysis revealed that the cloned PEPC gene was light-inducible leaf-specifically expressed and classified as C4-type sub-family groups.

Key words: Amarnthus hypochondriacus, C4 photosynthetic type, PEPC, gDNA, Leaf-specific, Light-inducible expression

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