Molecular cloning and characterization of SoNCED, a novel gene encoding 9-cis-epoxycarotenoid dioxygenase from sugarcane (Saccharum officinarum L.)
文献类型: 外文期刊
第一作者: Nong, Qian
作者: Nong, Qian;Yang, Li-Tao;Li, Yang-Rui;Li, Chang-Ning;Srivastava, Manoj-Kumar;Yang, Li-Tao;Li, Yang-Rui;Li, Chang-Ning;Srivastava, Manoj-Kumar;Yang, Li-Tao;Li, Yang-Rui
作者机构:
关键词: Cloning;Gene expression;NCED;ROS;Sugarcane
期刊名称:GENES & GENOMICS ( 影响因子:1.839; 五年影响因子:1.329 )
ISSN:
年卷期:
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收录情况: SCI
摘要: Abscisic acid (ABA) plays important roles in adaptive responses to various environmental stresses. The rate-limiting step in ABA biosynthesis is the oxidative cleavage of cis-epoxycarotenoids, which is catalyzed by 9-cis-epoxycarotenoid dioxygenase (NCED). In this experiment, a full-length cDNA encoding NCED gene was cloned by RT-PCR and RACE from sugarcane (Saccharum officinarum L.). The full-length of SoNCED is 2,521 bp with 1,827 bp open reading frame, encoding a peptide of 608 amino acids. The calculated molecular weight of protein was 65.9 kDa with isoelectric point of 6.04. Conserved domains prediction indicated a chloroplast-targeting peptide located at N-terminus of SoNCED. Phylogenetic tree, constructed by Neighbor-Ioining method indicatedthat SoNCED shared high identity with the NCEDs reported from other plant species. Sequence alignment revealed that the basic secondary structure including alpha, beta-strands, beta-propeller and His residues coordinating catalytic sites of SoNCED were highly conserved as in the NCEDs from other plants. Tissue specific expression analysis using quantitative real-time PCR showed a significant increase in SoNCED mRNA level and its correlation with O_2- production rate and ABA accumulation in leaves and roots of sugarcane variety GT21 when exposed to water stress. Further, the stimulation of SoNCED mRNA level, O_2 production rate and ABA content after exogenous application of ABA (100 muMol l~(-1)) proved its involvement in pathways providing tolerance todrought stress.
分类号: Q
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