Scientia Agricultura Sinica ›› 2020, Vol. 53 ›› Issue (10): 1997-2008.doi: 10.3864/j.issn.0578-1752.2020.10.007

• PLANT PROTECTION • Previous Articles     Next Articles

Function of Citrus Bacterial Canker Resistance-Related Transcription Factor CitMYB20

YAO LiXiao,FAN HaiFang,ZHANG QingWen,HE YongRui,XU LanZhen,LEI TianGang,PENG AiHong,LI Qiang,ZOU XiuPing,CHEN ShanChun()   

  1. National Center for Citrus Variety Improvement, Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, Chongqing 400712
  • Received:2019-10-13 Accepted:2019-11-26 Online:2020-05-16 Published:2020-05-22
  • Contact: ShanChun CHEN E-mail:chenshanchun@cric.cn

Abstract:

【Objective】The objective of this study is to reveal the response of CitMYB20 to Xanthomonas citri subsp. citri (Xcc) and exogenous phytohormones in different citrus varieties, evaluate the resistance of transgenic plants to citrus bacterial canker (CBC), and to verify the biological function of CitMYB20.【Method】The primer pairs were designed according to the Citrus genome, the open reading frame sequences and promoter sequences of CitMYB20 were cloned from CBC resistant variety Fortunella japonica and CBC sensitive variety Poncirus trifoliata by PCR. The cis-acting elements of promoter sequences were predicted using online software PlantCARE. The detached mature leaves from F. japonica and P. trifoliata were inoculated with Xcc by acupuncture method, and collected at 0, 1, 3, and 5 d after inoculation. The citrus leaves were collected after being treated with exogenous salicylic acid, methyl jasmonate, and ethephon respectively for 0, 12, 24, 36, and 48 h. The expression of CitMYB20 was detected by qRT-PCR using the above treated leaves. The over-expressed vector and RNA interference vector of CitMYB20 were constructed through inserting the target sequences into the pLGNe plasmid. The transgenic plants were obtained through Agrobacterium tumefaciens, and the mature leaves of transgenic lines were randomly selected to conduct resistance evaluation against CBC.【Result】The open reading frames of CitMYB20 in F. japonica (GenBank number MN689609) and P. trifoliata (GenBank number MN689608) were highly conservative, with a similarity of 99%. There were abscisic acid-responsive and methyl jasmonate-responsive cis-acting elements in the promoter sequence of CitMYB20 from two varieties of citrus. However, there was a salicylic acid-responsive element in the promoter sequence from F. japonica (GenBank number MN689611), but not in the sequence from P. trifoliata (GenBank number MN689610). At the 5th day of Xcc in vitro inoculation, the expression of CitMYB20 in mature leaves of F. japonica was increased significantly, reaching 2.5 times of the healthy control, while the expression of CitMYB20 in P. trifoliata did not show significantly change during the whole infection period. During exogenous hormone treatment, the response of CitMYB20 to salicylic acid and methyl jasmonate was similar, that is, it showed the trend of first increasing and then decreasing in F. japonica, while the expression of CitMYB20 in P. trifoliata was decreased firstly and then returned to normal. When the leaves were treated with exogenous ethephon, the expression of CitMYB20 in F. japonica was decreased slightly, while in P. trifoliata, it showed the trend of first increasing and then decreasing. A total of 7 over-expressed plants and 5 RNA-interfered ones were obtained through genetic transformation. There was no significant difference in morphological development between transgenic plants and control plants. The results of disease resistance evaluation showed that the CitMYB20 over-expressed plants could reduce the symptom of CBC, while the RNA-interfered plants were more sensitive to Xcc.【Conclusion】The expression of CitMYB20 was induced by Xcc in CBC resistant variety. CitMYB20 is a positive regulatory transcription factor against Xcc, its function against CBC may require salicylic acid and jasmonic acid signaling pathway. CitMYB20 can be used as a candidate gene for genetically modified breeding against CBC.

Key words: Xanthomonas citri subsp. citri (Xcc), citrus bacterial canker (CBC), R2R3-MYB transcription factor, overexpression, RNA interference (RNAi), disease resistance

Table 1

The primer sequences"

引物名称
Primer name
用途
Amplification
引物序列
Primer sequence (5′-3′)
备注
Remark
CitMYB20-F 克隆基因开放阅读框
To clone ORF sequence
ATAGGATCCATGGGGAGGGCTCCCTG BamH I酶切位点
BamH I restriction site
CitMYB20-R CCGGAATTCCTAAAATGGTAATGTTAATGAGTCTGC EcoR I酶切位点
EcoR I restriction site
CitMYB20-F (g) 克隆基因抑制表达片段
To clone RNAi fragment sequence
GCTCTAGAGGCGCGCCAAGCAAAACCAGAAGGCC Xba I和Asc I酶切位点
Xba I and Asc I restriction site
CitMYB20-R (g) CGCGGATCCATTTAAATACCGATCGCAAATTCATTAAG BamH I和Sma I酶切位点
BamH I and Sma I restriction site
CitMYB20-F (P) 克隆启动子
To clone promoter sequence
CCAGAACCTTTACTTTAATTTCTATTTTTA
CitMYB20-R (P) CTTGTTAATTTCTTTCAAAGTAGTGGAG
CitMYB20-F (q) 检测CitMYB20的表达量
To detect CitMYB20 expression
CTCCTCGGTCACTACTGGAGA
CitMYB20-R (q) CATTAAGGCCGCCTCCGAAA
actin-f 检测actin的表达量
To detect actin expression
CATCCCTCAGCACCTTCC
actin-r CCAACCTTAGCACTTCTCC
35S-F 鉴定过表达植株
To identify over-expressed plant
GGAGTCAAAGATTCAAATAGAGGACCTAAC
CitMYB20-R (OE) TGACCACCTATTCCCCAACATGT
CitMYB20-F (RNAi) 鉴定RNAi抑制表达植株
To identify RNAi plant
ATTTGCGATCGGTATTTAAATGTGTAA
CitMYB20-R (RNAi) GCTAGCCAGGATCCAAATACCTGCAAA

Table 2

Cis-acting elements in promoter of CitMYB20 predicted through PlantCARE"

元件名称
Motif name
序列
Sequence
位置Position 方向Strand 功能
Function
枣阳小叶枳
P. trifoliata
金弹金柑
F. japonica
枣阳小叶枳
P. trifoliata
金弹金柑
F. japonica
ABRE ACGTG -1198 -1190 + + 脱落酸响应
Abscisic acid responsiveness
CGTCA-motif CGTCA -321 -321 - - 茉莉酸甲酯响应
Methyl jasmonate responsiveness
-316 +
TGACG-motif TGACG -321 -321 + +
-316 -
TCA-element CCATCTTTTT -1452 - 水杨酸响应
Salicylic acid responsiveness
-1390 +

Fig. 1

The expression of CitMYB20 induced by Xcc"

Fig. 2

Expression analysis of CitMYB20 induced by different hormones"

Fig. 3

Detection of CitMYB20 relative expression level in over-expressed plants"

Fig. 4

Detection of CitMYB20 relative expression level in RNAi plants"

Fig. 5

Evaluation of citrus bacterial canker resistance in over-expressed CitMYB20 plants"

Fig. 6

Evaluation of citrus bacterial canker resistance in plants inhibiting CitMYB20 expression"

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