Scientia Agricultura Sinica ›› 2021, Vol. 54 ›› Issue (19): 4121-4131.doi: 10.3864/j.issn.0578-1752.2021.19.008

• PLANT PROTECTION • Previous Articles     Next Articles

Cloning and Analysis of P-glycoprotein Gene and Its Transcriptional Response to Insecticide in Chilo suppressalis

MENG XiangKun(),WU ZhaoLu,YANG XueMei,GUAN DaoJie,WANG JianJun()   

  1. College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, Jiangsu
  • Received:2021-02-06 Accepted:2021-02-27 Online:2021-10-01 Published:2021-10-12
  • Contact: JianJun WANG E-mail:mxk@yzu.edu.cn;wangjj@yzu.edu.cn

Abstract:

【Objective】The CsPgp was cloned from Chilo suppressalis, and the molecular characteristics and expression profiles of CsPgp were analyzed. Transcriptional responses as well as the potential transcriptional regulation mechanism of CsPgp to two common used insecticides (chlorantraniliprole and abamectin) were also studied.【Method】The full length of CsPgp was cloned from C. suppressalis using the gene cloning technology. The molecular characteristics and the transcription factor binding sites in 5′ transcriptional regulatory region of CsPgp were analyzed employing the bioinformatics technologies. Expression profiles of CsPgp in different stages and tissues of C. suppressalis, and the transcriptional responses of CsPgp to different doses of chlorantraniliprole and abamectin treatment were determined using the real-time quantitative PCR.【Result】The full length of CsPgp cDNA is 4 584 bp and consists of 23 exons. The encoding protein has 1 259 amino acids containing two transmembrane regions and two nucleotide binding domains and the typical structural features of ABC transporter family such as the Walker A, Walker B and D, H, P, Q-Loop which have important function in substrate transfer. CsPgp was mainly expressed in larval stage of C. suppressalis, especially in the 3rd and 4th instar larvae, while CsPgp showed low expression levels in the pupal and adult stages. Analysis of the tissue expressions showed that CsPgp was predominately expressed in the foregut and midgut, and had very low expression levels in other tissues including hindgut, fat body and Malpighian tubule. No significant change of CsPgp expression was found in the 3rd instar larvae of C. suppressalis after treated with LC30 and LC70 of chlorantraniliprole for 12 and 24 h, respectively, when compared with the control groups. However, the expressions of CsPgp were significantly up-regulated in larvae after treated with LC30 of chlorantraniliprole for 36 h, while the expressions of CsPgp were significantly down-regulated in larvae after treated with LC70 of chlorantraniliprole for 36 h. In the 0.05 mg·L-1 of abamectin treatment, CsPgp was remarkably down-regulated at 12 h post-treatment, while the expressions of CsPgp were not significantly changed at 24 and 36 h post-treatment, respectively. However, CsPgp was significantly induced in larvae after treated with 0.15 mg·L-1 of abamectin for 24 and 36 h, respectively. Sequence analysis of the 5′ transcriptional regulatory region of CsPgp showed that multiple transcription factor binding sites were predicted in the 5′ transcriptional regulatory region of CsPgp, including five potential CncC binding sites.【Conclusion】CsPgp was highly expressed in the midgut of C. suppressalis and could be induced by chlorantraniliprole and abamectin, which indicated that CsPgp might involve in the detoxification metabolism of chlorantraniliprole and abamectin in C. suppressalis. Multiple CncC binding sites were found in the 5′ transcriptional regulatory region of CsPgp which might have important regulatory effects on the expression of CsPgp. It was speculated that CsPgp might be regulated by transcription factor CncC and participated in the detoxification metabolism of chlorantraniliprole or abamectin when C. suppressalis was exposed to chlorantraniliprole or abamectin.

Key words: Chilo suppressalis, P-glycoprotein, molecular characteristic, insecticide induction, transcriptional regulation

Table 1

The primers used for gene cloning and analysis of CsPgp"

引物名称Primer name 序列Sequence (5′ to 3′) 作用Function
CsPgp F CAGCTTTGAATCAGGACTTTGC CsPgp基因片段扩增
Gene fragment amplification of CsPgp
CsPgp R ATCCACTCCGATTGAGGTTGTA
CsPgp 5′R1 CCATCCCTTCACAAGTGCCATTAT CsPgp 5′端片段扩增
5′ end fragment amplification of CsPgp
CsPgp 5′R2 CGAACGCCGATTGGTAGAAAAC
CsPgp 3′F1 GCGTTGGATACGGAAAGCGAAAA CsPgp 3′端片段扩增
3′ end fragment amplification of CsPgp
CsPgp 3′F2 AGTGCGGGACGCCGACCTTATA
DLCsPgp F GCAGGATGCACCACTCCTATCA CsPgp定量分析
Quantitative analysis of CsPgp
DLCsPgp R TGGCCGCTCCGACTATACAGTTA
EF-1α F TGAACCCCCATACAGCGAATCC
EF-1α R TCTCCGTGCCAACCAGAAATAGG
CsPgp 5′F GCACTATTACACTTTTTAATGAG CsPgp 5′侧翼区DNA序列克隆
5′ lateral DNA sequence cloning of CsPgp
CsPgp 5′R GCGTTTCCGTTCAAATCATAAG

Fig. 1

Sequence characteristics analysis of CsPgp"

Fig. 2

Phylogenetic analysis of Pgp of different species"

Fig. 3

Relative expression levels of CsPgp in different developmental stages of C. suppressalis"

Fig. 4

Relative expression levels of CsPgp in different tissues of C. suppressalis"

Fig. 5

Expression changes of CsPgp after treated with different concentrations of abamectin and chlorantraniliprole *表示存在显著差异* indicates significant difference (* P<0.05; ** P<0.01; *** P<0.001)"

Fig. 6

Sequence analysis of 5′ DNA fragment of CsPgp The predicted transcription factors are marked by single underline, and the predicted promoter sequence is marked by double underline. The transcription start site is indicated by bold letter. The first base of initiation code of CsPgp is indicated as “+1”, and its upstream sequences are indicated as “-”"

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