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Acta Agronomica Sinica ›› 2020, Vol. 46 ›› Issue (9): 1332-1339.doi: 10.3724/SP.J.1006.2020.02013

• CROP GENETICS & BREEDING · GERMPLASM RESOURCES · MOLECULAR GENETICS • Previous Articles     Next Articles

Molecular identification of rice bacterial blight susceptible gene Xig1 and creation of disease resistant resources

ZHENG Kai-Li1(), JI Zhi-Yuan1(), HAO Wei1, TANG Yong-Chao1, WEI Ye-Na1,2, HU Yun-Gao2, ZHAO Kai-Jun1, WANG Chun-Lian1,*()   

  1. 1 Institute of Crop Sciences, Chinese Academy of Agricultural Sciences / National Key Facility for Crop Gene Resources and Genetic Improvement, Beijing 100081, China
    2 Rice Research Institute, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
  • Received:2020-02-27 Accepted:2020-04-15 Online:2020-09-12 Published:2020-05-07
  • Contact: Chun-Lian WANG E-mail:zhkl111007@163.com;jizhiyuan@caas.cn;wangchunlian@caas.cn
  • Supported by:
    National Natural Science Foundation of China(31571640);Young Elite Scientist Sponsorship of China Association for Science and Technology(2017QNRC001)

Abstract:

The rice bacterial blight susceptible gene Xig1 (Xoo-induced-gene 1), was found highly induced by Xanthomonas oryzae pv. oryzae (Xoo) in susceptible parent line IR24 but not in introgression line W6023. In this study, we cloned and sequenced Xig1 alleles isolated from W6023 and IR24, and the main difference in nucleotide sequences between Xig1 alleles of W6023 and IR24 was in the promoter region. Subcellular localization in rice protoplast indicated that XIG1 localized to cytoplasm. CRISPR/Cas9-based genome editing technologies were also applied to knock out Xig1 in IR24. Eight Xig1-edited mutant lines showed a higher resistance to Xoo, and all agronomic traits surveyed are consistent. Xig1 is a novel susceptible gene for bacterial blight in rice. The studying of the mechanism of Xig1 to Xoo in rice will not only provide a theorical guidance for disease resistance resource, but also benefit the understanding of plant innate immunity.

Key words: rice, bacterial blight, Xig1, CRISPR/Cas9

Fig. 1

Relative expression level of Xig1 in IR24 and W6023 under the inoculation of P6"

Table 1

Cis-acting elements of Xig1IR24 gene promoter region"

顺式作用元件
Cis-acting element
核心序列
Core sequence
功能
Function
数量
Amount
GARE-motif AAACAGA 赤霉素反应元件Gibberellin response-related elements 1
GT1-motif GGTTAA 光响应元件Light response elements 2
MBS CGGTCA, CAACTG MYB结合位点、参与干旱诱导
MYB binding sites involved in drought-inducibility
4
Skn-1motif GTCAT 胚乳表达所需元件Elements related to endosperm expression 4
TA-rich region TATATATATATATATATATATA 增强子Enhancer 1
TATA-box TATA, TTA, TAATA 核心启动子元件Core promoter element 21
TC-rich repeats GTTTTCTTAC, ATTTTCTCCA 防御和应激反应元件
Elements involved in defense and stress responsiveness
2
TGA-element AACGAC 生长素应答元件Auxin response elements 1

Fig. 2

Subcellular localization of XIG1::YFP in rice protoplast YFP: yellow fluorescent signal; Merge: YFP and bright field images were merged."

Fig. 3

Molecular detection of T0 transgenic plants M: marker; WT: IR24 (negative control); 1-32: T0 transgenic plants."

Fig. 4

The target sequences of the 17 homozygous Xig1-edited lines of T2 Capitalized bold letters are PAM sequences; underlined sequences are target sequences; red dashes indicate nucleotide deletions; red lowercase letters indicate inserted nucleotides; italic capital letters are initiation codons. The numbers on the right side of the sequences represent the types of mutation at each target site and the number of nucleotides involved in the mutation. “-” and “+” indicate the number of deletion and insertion nucleotides, respectively. The 100 bp are the bases not shown in this sequence."

Fig. 5

Disease response to Xoo strain P6 of 8 T2 transgenic lines A, C: Disease reactions of 7 days and 14 days after inoculation in eight transgenic lines and IR24. B, D: Lesion length of 7 days and 14 days after inoculation with PXO99A in eight transgenic lines compared with IR24. ** denotes significantly different (P < 0.01). Arrows indicates the inoculated leaves of IR24."

Table 2

Analysis of agronomic traits of 8 gene editing lines"

基因编辑株系
Lines
株高
Plant height
(cm)
分蘖数
Number of tillers
穗粒数
Number of grains
per panicle
结实率
Seed-setting rate
(%)
千粒重
Thousand-seed weight (g)
籽粒产量
Grain yield (g)
IR24 87.2±2.1 a 10.8±1.3 a 112.7±12.6 a 82.9±1.9 a 24.8±0.8 a 24.5±2.9 a
Xig1-3 87.1±1.6 a 11.9±1.7 a 110.9±9.9 a 80.2±1.4 a 24.4±1.0 a 26.0±4.5 a
Xig1-6 87.8±2.6 a 11.8±1.9 a 108.8±5.5 a 80.0±1.7 a 25.9±0.9 a 26.7±2.6 a
Xig1-12 86.7±2.5 a 10.6±0.9 a 114.5±10.9 a 81.2±1.5 a 24.6±0.7 a 24.9±6.0 a
Xig1-15 86.5±1.5 a 10.5±1.7 a 114.6±11.3 a 83.6±0.4 a 24.9±1.8 a 25.2±2.5 a
Xig1-20 86.7±1.5 a 11.3±1.6 a 116.7±8.9 a 84.1±1.1 a 25.1±1.2 a 28.0±3.7 a
Xig1-21 87.6±2.3 a 10.4±1.5 a 123.0±10.0 a 82.7±2.2 a 25.9±1.3 a 27.2±2.0 a
Xig1-24 88.2±1.9 a 13.2±3.2 a 97.4±4.3 a 83.2±3.3 a 25.2±0.5 a 26.8±2.1 a
Xig1-26 88.4±1.7 a 10.2±2.2 a 118.0±12.9 a 84.2±3.3 a 25.5±0.8 a 25.6±3.1 a
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