文献类型：期刊文献

英文题名：Overexpression of phosphoenolpyruvate carboxylase from Jatropha curcas increases fatty acid accumulation in Nicotiana tabacum

作者：Fan, Zhengqi[1] Li, Jiyuan[1] Lu, Mengzhu[2] Li, Xinlei[2] Yin, Hengfu[1]

第一作者：范正琪

通信作者：Yin, HF[1]

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, Hangzhou 311400, Zhejiang, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, Beijing 100091, Peoples R China

年份：2013

卷号：35

期号：7

起止页码：2269-2279

外文期刊名：ACTA PHYSIOLOGIAE PLANTARUM

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000320561500023)】；

基金：This work was supported by the funds from Key Projects in the National Science and Technology Pillar Program during the Twelfth Five-year Plan Period (No. 2012BAD01B0703). We also acknowledge the Nonprofit Research Projects (RISF6153, RISF6141) and Country's international cooperation projects (2011DFA30490). We thank Dr. Renying Zhuo (Chinese Academy of Forestry) for providing seeds of wild type tobacco. We are grateful to Dr. Peng Gao (National Research Council Canada) for the help of fatty acid analysis. We greatly appreciate two anonymous reviewers and the editor for critical reading and helpful comments.

语种：英文

外文关键词：Carbon partitioning; JcPEPC1; Biofuel tree; Fatty acid biosynthesis; Jatropha curcas

摘要：Jatropha curcas L. is an excellent biofuel crop, which displays a high efficiency of carbon absorption, and seed oil of Jatropha can be efficiently processed to produce high-quality biodiesel. Plant phosphoenolpyruvate carboxylases (PEPCs) play important roles not only in initial fixation of atmospheric CO2 in C-4 and Crassulacean acid metabolism (CAM) plants, but also in fatty acid biosynthesis in seeds of oil plants by regulating carbon partitioning. Here, we identified JcPEPC1 from J. curcas L. by homology cloning, and alignment analysis of protein sequence revealed JcPEPC1 was a plant C-3-type PEPC, and shared high similarity to PEPC of castor oil plant Ricinus communis. We implemented detailed functional characterization of JcPEPC1 by expression analysis and transgenic tobacco. JcPEPC1 gene expressed in the leaves and seeds of J. curcas L., and remarkable increase of expression level was also detected at seed oil-accumulating stages. We overexpressed JcPEPC1 in tobacco, and showed the enzymatic activity of PEPC in transgenic plants was notably higher than wild type. Gas chromatography (GC) analysis elucidated the composition and total content of fatty acids were also altered. This study indicated JcPEPC1 played a fundamental role in fatty acid biosynthesis in Jatropha seeds. Our results proposed enhanced PEPC activity of Jatropha could improve biosynthesis of fatty acid, which implied critical functions in primary metabolism of non-photosynthetic PEPC.