Scientia Agricultura Sinica ›› 2019, Vol. 52 ›› Issue (4): 639-650.doi: 10.3864/j.issn.0578-1752.2019.04.006

• PLANT PROTECTION • Previous Articles     Next Articles

Cloning and Expression Analysis of the Citrus Bacterial Canker-Related Gene CsPGIP in Citrus

HU AnHua,QI JingJing,ZHANG QingWen,CHEN ShanChun,ZOU XiuPing,XU LanZhen,PENG AiHong,LEI TianGang,YAO LiXiao,LONG Qin,HE YongRui(),LI Qiang()   

  1. Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, Chongqing 400712
  • Received:2018-10-13 Accepted:2018-11-26 Online:2019-02-16 Published:2019-02-27
  • Contact: YongRui HE,Qiang LI E-mail:heyongrui@cric.cn;liqiang@cric.cn

Abstract:

【Objective】The objective of this study is to clone CsPGIP and analyze its expression characteristics, construct CsPGIP transgenic citrus and evaluate the resistance to citrus bacterial canker (CBC), and to provide a theoretical basis for molecular breeding of citrus bacterial canker.【Method】CsPGIP was annotated from the genomic databases and cloned from Wanjincheng and Calamondin. MEGA6 was used for multiple sequence alignment and phylogenetic tree was constructed. Two online softwares BaCelLo and SignalP 4.0 were used for the prediction of subcellular localization and signal peptide. The predicted result was then demonstrated by GFP transient expression. The expression profile of CsPGIP induced by Xanthomonas citri subsp. citri (Xcc) was also analyzed in Wanjincheng and Calamondin by using qRT-PCR method. The correlation between Xcc infection and CsPGIP expression was analyzed. Genetic transformation of Wanjincheng was conducted by Agrobacterium-mediated method. The over-expressed lines were identified by GUS staining, PCR and qRT-PCR. The phenotypic changes of transgenic and wild-type lines were observed, plant height and leaf phenotype were analyzed. In vitro acupuncture was used to evaluate the resistance of transgenic lines and wild-type lines to citrus bacterial canker. The effect of CsPGIP expression on resistance and susceptibility to citrus bacterial canker was analyzed by statistical analysis of lesion area (LA) and disease index (DI). 【Result】The PGIP cloned from Wanjincheng and Calamondin encodes 328 amino acids, which is 99.39% homology with the reported CsPGIP from Clementina, and contains two typical LRR domains (LRR_1 and LRR_2). In the phylogenetic tree, the genetic distance between CsPGIP and grape PGIP (GSVIVT01033370001) was the closest, and the similarity was 62.97%. It is inferred that CsPGIP and grape PGIP have similar resistance to disease. The prediction of subcellular localization and signal peptide indicated that CsPGIP was a secretory protein, and GFP transient expression proved that CsPGIP located on cell membrane and cell wall, which was consistent with the predicted results. The expression of CsPGIP in canker sensitive plant Wanjincheng and canker resistant plant Calamondin was different after inoculated with Xcc. The expression of CsPGIP was significantly down-regulated in Wanjincheng, but significantly up-regulated and maintained at a high level in Calamondin. It is speculated that CsPGIP was related to resistance to citrus bacterial canker. CsPGIP over-expression vector was constructed and transformed into Wanjincheng, and nine CsPGIP over-expression lines (OE1, OE3, OE4, OE5, OE6, OE9, OE10, OE12 and OE14) were identified as CsPGIP over-expression positive lines by PCR identification and qRT-PCR. Through the phenotypic observation of transgenic lines, it was found that the phenotypes of OE3 and OE14 lines were significantly different from those of wild-type lines. The plant was short, in which OE14 was also abnormal with curly property and greater thickness. The in vitro canker resistance of eight CsPGIP over-expression lines was evaluated. The results showed that the lesion area on the eight CsPGIP over-expression lines was smaller compared to that on the wild-type (24.11%-83.88%), and the lesion area of OE1 was the smallest. In terms of disease index, the disease index of CsPGIP over-expression lines (except OE3) was significantly lower than that of wild-type (23.12%-75.49%), and the decrease of OE1 was the most significant. The above results showed that over-expression of CsPGIP could effectively inhibit the growth of citrus bacterial canker.【Conclusion】CsPGIP is an important gene which can inhibit or reduce the incidence of citrus bacterial canker, and has a great application value in the mechanism study of citrus resistance to bacterial canker. In the same time, it can be used as a candidate gene for molecular breeding of citrus bacterial canker resistance.

Key words: citrus bacterial canker (CBC), polygalacturonase inhibitor protein, CsPGIP, over-expression, CBC resistance

Table 1

The primers used in this study"

引物名称Primer name 引物序列Primer sequence (5′-3′) 酶切位点Enzyme site
OE-CsPGIP-f CGGGATCCATGAGCAACACGTCACTGTTGTCT BamHI
OE-CsPGIP-r CGGAATTCTCACTTGCAGCTTTCGAGGGGCGC EcoRI
SCL-CsPGIP-f GGGGTACCATGAGCAACACGT CACTGTTGT KpnI
SCL-CsPGIP-r TCCCCCGGGCTTGCAGCTTTCG AGGGGCGCG SmaI
qPCR-CsPGIP-f AGAAGCTTGGCGCTCTTCAT N/A
qPCR-CsPGIP-r TCGCCTTCAAGCTTGTTCCT N/A
qPCR-Actin-f CATCCCTCAGCACCTTCC N/A
qPCR-Actin-r CCAACCTTAGCACTTCTCC N/A
OE-f (35S) AGTAAGGATCGAT CCCACAAAGT N/A
OE-r (CsPGIP) TTTTTGAAGAGTAGTGAAGCTGCA N/A

Fig. 1

Sequence alignment of the CsPGIP in three Citrus spp. Dark blue and light blue represent the same and different amino acid sequences, respectively. LRR_1 and LRR_2 are LRR structural domains in PGIP"

Fig. 2

The phylogenetic tree of PGIPs from different species Genes in this study are all from Phytozome (http://www.phytozome.com/)"

Fig. 3

The subcellular localization of CsPGIP"

Fig. 4

The expression of CsPGIP induced by Xcc Different lowercases indicate significant difference (P<0.05)"

Fig. 5

Identification of transgenic lines and CsPGIP expression profiles"

Fig. 6

The phenotype analysis of over-expressed transgenic lines"

Fig. 7

The Xcc resistance of over-expressed transgenic lines"

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