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Acta Agron Sin ›› 2014, Vol. 40 ›› Issue (06): 1002-1010.doi: 10.3724/SP.J.1006.2014.01002

• CROP GENETICS & BREEDING · GERMPLASM RESOURCES · MOLECULAR GENETICS • Previous Articles     Next Articles

Cloning and Expression of Sugarcane S-Adenosylmethionine Synthetase Gene ScSAM

SONG Xiu-Peng1,ZHANG Bao-Qing2,HUANG Xing2,YANG Li-Tao1,2,*,LI Yang-Rui1,2,*   

  1. 1 Agricultural College / State Key Laboratory of Conservation and Utilization of Subtropical Agro-bioresources, Guangxi University, Nanning 530004, China; 2 Guangxi Academy of Agricultural Sciences / Sugarcane Research Center, Chinese Academy of Agricultural Sciences / Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Ministry of Agriculture / Guangxi Key Laboratory of Sugarcane Genetic Improvement, Nanning 530007, China
  • Received:2013-11-17 Revised:2014-03-04 Online:2014-06-12 Published:2014-04-09
  • Contact: 杨丽涛, E-mail: liyr@gxu.edu.cn, Tel: 0771-3236407; 李杨瑞, E-mail: liyr@gxaas.net, Tel: 0771-3247689

Abstract:

The full-length sequencecDNA of ScSAM (GenBank accession number: KC172558) was cloned from sugarcane variety ROC 22 using RT-PCR combined with RACE techniques. This sequence consists of 1466 bp with an intact open reading frame of 1191 bp, encoding a polypeptide of 396 amino acids. Homology analysis showed that the deduced ScSAM protein was highly homologous to SAM proteins from different species. Phylogenetic analysis indicated that ScSAM was closely related to the SAM of sorghum. Real-time PCR results showed that the ScSAM gene constitutively expressed in plant, with different expression levels in root, stalk and leaf. The transcript of ScSAM in root was the highest among the three organs, which was 3.6 times higher than that in leaf. Furthermore, ScSAM transcription was induced by biotic (smut infection) and abiotic (low temperature, PEG and NaCl) stresses, but the expression patterns were different. Under oxidative stress (H2O2), the expression of ScSAM was inhibited. We suggested that ScSAM might participate in smut-resistant activities in sugarcane, and also play a role in sugarcane resistances to chill, drought, salt and oxidation stresses.

Key words: Sugarcane, S-Adenosylmethionine synthetase (SAM), Clone, Expression analysis

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