Scientia Agricultura Sinica ›› 2013, Vol. 46 ›› Issue (3): 496-506.doi: 10.3864/j.issn.0578-1752.2013.03.006

• PLANT PROTECTION • Previous Articles     Next Articles

Annotation and Comparative Analysis of the Carbohydrate-Active Enzymes in Cotton Pathogen

 CHEN  Jie-Yin, LIU  Shao-Yan, LI  Lei, DAI  Xiao-Feng   

  1. 1.Institite of Agro-products Processing Science and Technology, Chinese Academy of Agricultural Sciences, Beijing 100193
    2.Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081
  • Received:2012-08-15 Online:2013-02-01 Published:2013-01-10

Abstract: 【Objective】The objective of this study is to annotate and compare the carbohydrate-active enzymes (CAZymes) in seven cotton pathogens and two endophyte of Trichoderma viride and Bacillus subtilis, and identify plant cell wall degrading enzymes in cotton pathogen.【Method】The core gene set of cotton pathogen and endophytes were selected with BLASTP methods and the phylogenetic tree of nine microorganisms was analyzed. The CAZymes of nine microorganism genomes were annotated with CAZymes database by BLASP method and the CAZymes were classified into different sub-families. All sub-families of plant cell wall degrading enzymes were compared between cotton pathogen and endophyte, and the expansion subfamilies in cotton pathogen were obtained. The phylogenetic tree of expansion sub-families was described by MEGA4.0 and the CAZymes response to pathogenicity or invasion were confirmed.【Result】The phylogenetic analysis of cotton pathogen showed that there was a difference in invasion characteristics between root and shoot. With the CAZymes annotation and comparison, the plant cell wall degrading enzymes of pectin, cellulose, starch and xylan were increased in cotton pathogen genome compared to endophyte, including the pectin degrading sub-families of GH35, GH78, GH105, PL1, PL3 and PL4, cellulose degrading sub-families of GH61 and CBM1, starch degrading sub-families of CBM20, and xylan degrading subfamilies of GH43. Moreover, phylogenetic analysis showed that the pectin degrading genes related to different pathogenicities and invasion were found in PL1 and PL3 sub-families.【Conclusion】Ten expansion sub-families of plant cell wall degrading enzymes in cotton pathogen were found and compared to endophyte which including GH35, GH43, GH61, GH78, GH105, PL1, PL3, PL4, CBM1 and CBM20. These results indicated that the expansion sub-families of pathogen play an important role in plant cell wall degrading and response to the pathogenicity and invasion characteristics.

Key words: cotton pathogen , carbohydrate-active enzymes , plant cell wall degradation enzymes , gene family expansion

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