Eur. J. Entomol. 104 (3): 369-376, 2007 | DOI: 10.14411/eje.2007.055

bmpkci is highly expressed in a resistant strain of silkworm (Lepidoptera: Bombycidae): Implication of its role in resistance to BmDNV-Z

Ke-Ping CHEN1, Hui-Qing CHEN1, Xu-Dong TANG2, Qin YAO1, Lin-Ling WANG1, Xu HAN1
1 Institute of Life Sciences, Jiangsu University, 301# Xuefu Road, Zhenjiang 212013, P.R. China; e-mail: kpchen@ujs.edu.cn
2 Institute of Life Sciences, Zhejiang University, Hangzhou, P.R. China

Using the fluorescent differential display technique, a special band named Bm541 was identified by screening for differentially expressed genes in the resistant silkworm strain Qiufeng, the susceptible strain Huaba35, and the near isogenic line BC6, which carries the resistant gene to Bombyx mori densonucleosis virus (BmDNV). After applying the 5'RACE technique with specially designed primers, a 1148 bp cDNA clone containing a 387 bp open reading frame (ORF) was obtained. This gene was registered in GenBank under the accession number AY860950. The deduced amino acid sequence showed a 73.1% identity to the protein kinase C inhibitor (PKCI) of Drosophila pseudoobscura. In the deduced sequence of BmPKCI, the histidine triad (HIT) motif, which is essential for PKCI function, and the α-helix region, which is conserved among the PKCI family, were present. The data from quantitative real-time PCR (QRT-PCR) suggest that the expression levels of bmpkci in BC6 and Qiufeng both with BmDNV-Z are significantly higher than those in Huaba35, which indicate that BmPKCI plays a role in resistance to BmDNV-Z.

Keywords: PKCI, Bombyx mori, virus-resistance, densonucleosis virus, fluorescent differential display, quantitative real-time PCR

Received: January 18, 2007; Revised: March 13, 2007; Accepted: March 13, 2007; Published: July 25, 2007  Show citation

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CHEN, K., CHEN, H., TANG, X., YAO, Q., WANG, L., & HAN, X. (2007). bmpkci is highly expressed in a resistant strain of silkworm (Lepidoptera: Bombycidae): Implication of its role in resistance to BmDNV-Z. EJE, 104(3), 369-376. doi: 10.14411/eje.2007.055
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