Journal of Integrative Agriculture ›› 2015, Vol. 14 ›› Issue (4): 610-621.DOI: 10.1016/S2095-3119(14)60873-X

• 论文 • 上一篇    下一篇

Comparative transcriptome profiling of two maize near-isogenic lines differing in the allelic state for bacterial brown spot disease resistance

 WU Xiao-jun, Xu Li, ZHAO Pan-feng, LI Na, WU Lei, HE Yan, WANG Shou-cai   

  1. National Maize Improvement Center of China/Key Laboratory of Crop Genomics and Genetic of Maize, China Agricultural University, Beijing 100193, P.R.China
  • 收稿日期:2014-03-10 出版日期:2015-04-01 发布日期:2015-04-10
  • 通讯作者: WANG Shou-cai, Tel/Fax: +86-10-62732409,E-mail: wangshoucai678@sina.com
  • 基金资助:

    This work was supported by the National High-Tech R&D Program of China (2012AA10A305 and 2011AA10A103).

Comparative transcriptome profiling of two maize near-isogenic lines differing in the allelic state for bacterial brown spot disease resistance

 WU Xiao-jun, Xu Li, ZHAO Pan-feng, LI Na, WU Lei, HE Yan, WANG Shou-cai   

  1. National Maize Improvement Center of China/Key Laboratory of Crop Genomics and Genetic of Maize, China Agricultural University, Beijing 100193, P.R.China
  • Received:2014-03-10 Online:2015-04-01 Published:2015-04-10
  • Contact: WANG Shou-cai, Tel/Fax: +86-10-62732409,E-mail: wangshoucai678@sina.com
  • Supported by:

    This work was supported by the National High-Tech R&D Program of China (2012AA10A305 and 2011AA10A103).

PDF

摘要： The bacterial brown spot disease (BBS), caused primarily by Pseudomonas syringae pv. syringae van Hall (Pss), reduces plant vigor, yield and quality in maize. To reveal the nature of the defense mechanisms and identify genes involved in the effective host resistance, the dynamic changes of defense transcriptome triggered by the infection of Pss were investigated and compared between two maize near-isogenic lines (NILs). We found that Pss infection resulted in a sophisticated transcriptional reprogramming of several biological processes and the resistant NIL employed much faster defense responses than the susceptible NIL. Numerous genes encoding essential components of plant basal resistance would be able to be activated in the susceptible NIL, such as PEN1, PEN2, PEN3, and EDR1, however, in a basic manner, such resistance might not be sufficient for suppressing Pss pathogenesis. In addition, the expressions of a large number of PTI-, ETI-, PR-, and WRKY-related genes were pronouncedly activated in the resistant NIL, suggesting that maize employ a multitude of defense pathways to defend Pss infection. Six R-gene homologs were identified to have significantly higher expression levels in the resistant NIL at early time point, indicating that a robust surveillance system (gene-to-gene model) might operate in maize during Pss attacks, and these homolog genes are likely to be potential candidate resistance genes involved in BBS disease resistance. Furthermore, a holistic group of novel pathogen-responsive genes were defined, providing the repertoire of candidate genes for further functional characterization and identification of their regulation patterns during pathogen infection.

关键词: maize (Zea mays L.) , bacterial brown spot disease , RNA-Seq analysis , disease resistance

Abstract: The bacterial brown spot disease (BBS), caused primarily by Pseudomonas syringae pv. syringae van Hall (Pss), reduces plant vigor, yield and quality in maize. To reveal the nature of the defense mechanisms and identify genes involved in the effective host resistance, the dynamic changes of defense transcriptome triggered by the infection of Pss were investigated and compared between two maize near-isogenic lines (NILs). We found that Pss infection resulted in a sophisticated transcriptional reprogramming of several biological processes and the resistant NIL employed much faster defense responses than the susceptible NIL. Numerous genes encoding essential components of plant basal resistance would be able to be activated in the susceptible NIL, such as PEN1, PEN2, PEN3, and EDR1, however, in a basic manner, such resistance might not be sufficient for suppressing Pss pathogenesis. In addition, the expressions of a large number of PTI-, ETI-, PR-, and WRKY-related genes were pronouncedly activated in the resistant NIL, suggesting that maize employ a multitude of defense pathways to defend Pss infection. Six R-gene homologs were identified to have significantly higher expression levels in the resistant NIL at early time point, indicating that a robust surveillance system (gene-to-gene model) might operate in maize during Pss attacks, and these homolog genes are likely to be potential candidate resistance genes involved in BBS disease resistance. Furthermore, a holistic group of novel pathogen-responsive genes were defined, providing the repertoire of candidate genes for further functional characterization and identification of their regulation patterns during pathogen infection.

Key words: maize (Zea mays L.) , bacterial brown spot disease , RNA-Seq analysis , disease resistance