Scientia Agricultura Sinica ›› 2017, Vol. 50 ›› Issue (10): 1817-1826.doi: 10.3864/j.issn.0578-1752.2017.10.007

• PLANT PROTECTION • Previous Articles     Next Articles

Expression and Functional Analysis of Endocuticle Structural Glycoprotein Gene LmAbd-5 in Locusta migratoria

ZHAO XiaoMing1, JIA Pan1,2, GOU Xin1,2, LIU WeiMin1, MA EnBo1, ZHANG JianZhen1   

  1. 1Research Institute of Applied Biology, Shanxi University, Taiyuan 030006; 2College of Life Science, Shanxi University, Taiyuan 030006
  • Received:2016-11-28 Online:2017-05-16 Published:2017-05-16

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Abstract: 【Objective】The objective of this study is to obtain a cDNA sequence of endocuticle structural glycoprotein LmAbd-5based on Locusta migratoria transcriptome, clarify its molecular characteristics and biological function, reveal its role in the formation of cuticle in L. migratoria, and provide a new molecular target for pest control. 【Method】The full length cDNAof LmAbd-5 was searched from transcriptome database of L. migratoria using bioinformatics method. The cDNA was cloned and sequenced. The signal peptide and function domain of deduced amino acid were analyzed by SignalP and SMART, respectively. Phylogenetic tree was constructed using the sequences of amino acid from different insect species by the MEGA 7.0 software with the neighbor-joining (NJ) method. Reverse transcription quantitative PCR (RT-qPCR) was applied to reveal the expression patterns of LmAbd-5 in different tissues on day 2 of 5th instar nymph and different developmental stages of integument. The effects of LmAbd-5 on locust growth development and the structure of cuticle were investigated by using RNA interference (RNAi) and transmission electron microscopy (TEM). 【Result】The full length cDNA of LmAbd-5 was got from transcriptome database, which had 520 bp including ORF 303 bp. The gene structure analysis showed that LmAbd-5 has three exons. The deduced protein contains a signal peptide and one chitin binding domain 4 (ChtBD4) through the BLAST analysis, Abd-5 was highly conserved among insect species, and the sequence identity is as high as 81% between LmAbd-5 and SgAbd-5. Abd-5 belongs to the RR-1 class of CPR family by WebLogo analysis. The result of phylogenetic tree showed that LmAbd-5 has a close genetic relationship with SgAbd-5. RT-qPCR results showed that LmAbd-5 was predominately expressed in the tissues originated from ectoderm, such as the foregut, hindgut, trachea and integument, and lower expressed or not detected in the gastric caecum, midgut, Malpighian tube, fat body and wing pads. The expression at different stages showed that LmAbd-5 mainly expressed at early of 5th instar (0-72 h after ecdysis from 4th instar nymph), and up to the peak at 72 h after molting, then markedly decreased at 96-168 h. The expression pattern is related with the formation of endocuticle. Compared with dsGFP injected control, the nymphs with the injection of dsLmAbd-5 could normally molt, and no visible abnormal phenotypes was found although the expression of LmAbd-5 was decreased significantly after dsLmAbd-5 injection. However, compared to the control group, the lamellar structure from adult cuticle with injection of dsLmAbd-5 was loose, and lamellar became thicker, finally led to the endocuticle thickening. 【Conclusion】LmAbd-5 was obtained from locust transcriptome database, which contains a signal peptide and ChtBD4, belonging to the RR-1 class of CPR family. LmAbd-5 mainly expressed in the tissues derived from ectoderm and in integument at early of 5th instar. Although there was no visible phenotypes after silencing LmAbd-5, but it was found that the lamellar structure of endocuticle is loose and endocuticle becomes thicken from ultrastructure by TEM, suggesting it may be participated in the formation of endocuticle in L. migratoria.

Key words: Locusta migratoria, cuticular proteins, LmAbd-5, RNAi, transmission electron microscopy

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