大黄鱼与小黄鱼细胞色素b基因全序列的比较分析

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Abstract

The complete cytochrome b gene sequences of the large yellow croaker and the small yellow croaker were obtained and analyzed for the nucleotide compositions and the nucleotide pair frequencies. The contents of T、C、A、G、A+T were 28.4%/26.7%、33.0%/34.1%、23.2%/23.8%、15.4%/15.4% 、51.6%/50.5% in the cytb gene sequences of the large/small yellow croakers. Both gene sequences of these two species show similar traits in the nucleotide compositions and the nucleotide pair frequencies. The first codon positions showed no bias to any of the four nucleotides as a whole, while the second and third positions were rich in T and C respectively. 126 nucleotide sites were substituted and sequences similarity was merely 88.95% between these two sequences. The ratio of transitional to transversional substitution was 3.1 with the transitional rate between pyrimidines(C and T) being higher than that between purines(A and G). Most of the base substitutions occurred at the third loci of the codons.

Key words： Pseudosciaena crocea(Richardson) Pseudosciaena polyactics Bleeker cytochrome b sequence analysis

Received: 25 April 2005

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	Articles by authors
	CHEN Yi-yan
	QIAN Kai-cheng
	REN Gang
	CHEN Di
	ZHANG Qun

Cite this article:

CHEN Yi-yan,QIAN Kai-cheng,REN Gang, et al. Comparative analysis of the mitochondrial cytochrome b gene for Pseudosciaena crocea(Richardson) and P. polyactics Bleeker[J]. , 2005, 24(2): 143-145.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2005/V24/I2/143

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