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Scientia Silvae Sinicae ›› 2013, Vol. 49 ›› Issue (7): 62-68.doi: 10.11707/j.1001-7488.20130709

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Construction of a Suppression Subtractive Hybridization Library of Caragana korshinskii Under Drought Stress and Cloning of CkWRKY 1 Gene

Yang Qi1, Zhang Tao1, Wang Ying1, Li Gao1,2, Yin Jiajia1, Han Xiaomin1, Qi Liwang3, Li Guojing1, Wang Ruigang1   

  1. 1. College of Life Sciences, Inner Mongolia Agricultural University Hohhot 010018;
    2. Beijing Summer Palace Management Office Beijing 100091;
    3. Research Institute of Forestry, CAF Beijing 100091
  • Received:2012-10-09 Revised:2013-02-21 Online:2013-07-25 Published:2013-07-23

Abstract:

Caragana korshinskii is an important cultivated shrub with high ecological and forage value, and widely distributes in Northwest China. C. korshinskii has a strong tolerance to drought, cold, heat, saline and poor soil. In order to study its resistance mechanisms to drought and explore for drought response related genes, a suppression subtractive hybridization (SSH) library of C. korshinskii under drought stress was constructed. Totally 1 286 ESTs from the SSH library were obtained and the average length was 475 bp. As many as 645 Unigenes were identified through the EST sequence assembly. Many drought-related genes were annotated by Blasting, such as the genes encoding dehydration related LEA and DHN proteins as well as transcription factors including MYB, bZIP, WRKY, NAC, and bHLH families. A candidate gene encoding a member of WRKY transcription factor family was cloned by rapid amplification of cDNA ends technique, and was named as CkWRKY 1 (GenBank accession No. JX987095). The protein deduced from the cDNA was composed from 330 amino acids with a conserved region "WRKYGQK". Real-time-quantitative PCR analysis showed that drought stress enhanced CkWRKY 1 expression at the transcriptional level, indicating that CkWRKY 1 might be involved in the drought resistance mechanisms of C. korshinskii at molecular level.

Key words: Caragana korshinskii, drought stress, suppression subtractive hybridization (SSH) library, WRKY, gene cloning

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