阅读框全长657 bp,编码219个氨基酸,没有信号肽,没有跨膜结构,理论等电点pI为4.81,其分子量为25.07 kD,系统发育树分析表明GST7基因属于Delta亚家族。本研究发现GST7基因在烟粉虱适应不适寄主植物中起到一定作用,为将来RNAi研究GST7基因的功能奠定了基础。
关键词烟粉虱;基因克隆;序列分析
中图分类号:S 433.3
文献标识码:A DOI:10.3969/j.issn.05291542.2017.06.011
Comparison of the responses of glutathione Stransferase genes in
Bemisia tabaci B to different host plant transfers
He Chao1,2,Xie Wen2,Zhang Youjun2
(1.College of Plant Protection of Hunan Agricultural University, Changsha410128, China;
2. Department of Plant Protection, Institute of Vegetables and Flowers, Chinese
Academy of Agricultural Sciences, Beijing100081, China)
Abstract
The sweet potato whitefly Bemisia tabaci with wide host range is an important worldwide agricultural pest, causing serious damage to the crops. In order to study the response of glutathione Stransferases (GSTs) of B.tabaci B to host transfer, the expression of 23 GST genes were analyzed and then the transcriptome data, PCR and sequencing were used to get the ORF of GST7 gene. The bioinformation of GST7 was also elucidated. The results indicated that the expression levels GST7 and GST13 had significant difference in pepper compared with that in cotton (up to 2.31fold for GST7). In addition, bioinformatics analysis showed that the open reading frame of GST7 gene was 657 bp, encoding 219 amino acids, and it contained no signal peptide and transmembrane structure. The theoretical isoelectric point (pI) was 4.81 and its molecular weight was 25.07 kD. The phylogenetic tree analysis showed that GST7 belonged to the Delta subfamily. These results suggest that GST7 gene may play an important role in host plant adaptation of B.tabaci B and provide a fundamental study for GST7 gene.
Key words
Bemisia tabaci;gene cloning;sequence analysis
煙粉虱Bemisa tabaci (Gennadius)属于半翅目,粉虱科,小粉虱属,是一种世界性的农业害虫,对农业生产造成了巨大的损失[1]。烟粉虱主要是通过刺吸寄主植物韧皮部、分泌蜜露、传播植物型病毒对农作物造成危害[23]。烟粉虱是一个复合种,现在已经报道的至少有36个隐种,而且其寄主范围非常广泛,可以取食900多种植物[47]。Middle EastAsia Minor1(B型)和Mediterranean(Q型)是入侵性最强和危害农作物最严重的2个烟粉虱隐种。20世纪90年代末,B型烟粉虱在我国被发现,并成为危害我国很多经济作物的主要害虫[810]。烟粉虱在不同寄主植物上适合度差异很大,很可能与烟粉虱对不同植物的次生代谢产物的耐受性有关,很多研究是从昆虫三大解毒酶(P450、GST、CCE)的生化和分子响应为切入点而开展工作[1113]。如2008年,安志兰测定了B型烟粉虱(羧酸酯酶、乙酰胆碱酯酶和谷胱甘肽 S转移酶)在棉花、一品红、茄子和番茄4种寄主植物上的酶活力,结果表明B型烟粉虱茄子种群谷胱甘肽S转移酶活性最高[14];2009年,宋月芹通过离体酶活性测定表明甜菜夜蛾取食寄主植物后,体内磷酸酯酶、谷胱甘肽S转移酶和乙酰胆碱酯酶活性均发生变化[15];2014年,Mohammed Shabab报道GST16参与了植物生长素的解毒[16]。然而,目前还没有通过荧光定量PCR的方法分析烟粉虱在寄主转换中GST基因mRNA表达量的变化报道。
推荐访问: 寄主 基因 差异 转移 转换