Chestnut resistance to the blight disease: insights from transcriptome analysis

BMC Plant Biology

Research Article

Chun-Huai Cheng¹  Stephen Ficklin¹  Meg Staton¹  Kathleen Baier²  William Powell²  Stephan C Schuster³  Albert Abbott⁴  Nicholas Wheeler⁵  Ronald Sederoff⁵  Fred Hebard⁶  Norzawani M Buang Yassin⁷  Chia-Chun Yeh⁷  Joseph Park⁷  Abdelali Barakat⁸  John E Carlson⁹ 

[1] Clemson University Genomics Institute, Clemson University, 310 Biosystems Research Complex, 51 New Cherry Street, 29631, Clemson, SC, USA;College of Environmental Science & Forestry, State University of New York, One Forestry Drive, 13210-2788, Syracuse, NY, USA;Department Biochemistry and Molecular Biology, Pennsylvania State University, 310 Wartik laboratory, 16802, University Park, PA, USA;Department of Biochemistry and Genetics, Clemson University, 116 Jordan Hall, 29631, Clemson, SC, USA;Department of Forestry and Environmental Resources, North Carolina State University, Campus Box, 7247, 27695, Raleigh, NC, USA;Meadowview Research Farms, 24361-3349, Meadowview, VA, USA;The School of Forest Resources, and The Huck Institutes of the Life Sciences, Pennsylvania State University, 326 Forest Resources Building, 16802, University Park, PA, USA;The School of Forest Resources, and The Huck Institutes of the Life Sciences, Pennsylvania State University, 326 Forest Resources Building, 16802, University Park, PA, USA;Department of Biochemistry and Genetics, Clemson University, 116 Jordan Hall, 29631, Clemson, SC, USA;The School of Forest Resources, and The Huck Institutes of the Life Sciences, Pennsylvania State University, 326 Forest Resources Building, 16802, University Park, PA, USA;Department of Bioenergy Science and Technology, Chonnam National University, 500-757, Buk-Gu, Gwangju, Korea;

关键词: Salicyc Acid;    American Chestnut;    Chinese Chestnut;    Cryphonectria Parasitica;    Hypersensitivity Resistance;   

DOI  :  10.1186/1471-2229-12-38

 received in 2011-06-17, accepted in 2012-03-19,  发布年份 2012

来源: Springer

【 摘 要 】

BackgroundA century ago, Chestnut Blight Disease (CBD) devastated the American chestnut. Backcross breeding has been underway to introgress resistance from Chinese chestnut into surviving American chestnut genotypes. Development of genomic resources for the family Fagaceae, has focused in this project on Castanea mollissima Blume (Chinese chestnut) and Castaneadentata (Marsh.) Borkh (American chestnut) to aid in the backcross breeding effort and in the eventual identification of blight resistance genes through genomic sequencing and map based cloning. A previous study reported partial characterization of the transcriptomes from these two species. Here, further analyses of a larger dataset and assemblies including both 454 and capillary sequences were performed and defense related genes with differential transcript abundance (GDTA) in canker versus healthy stem tissues were identified.ResultsOver one and a half million cDNA reads were assembled into 34,800 transcript contigs from American chestnut and 48,335 transcript contigs from Chinese chestnut. Chestnut cDNA showed higher coding sequence similarity to genes in other woody plants than in herbaceous species. The number of genes tagged, the length of coding sequences, and the numbers of tagged members within gene families showed that the cDNA dataset provides a good resource for studying the American and Chinese chestnut transcriptomes. In silico analysis of transcript abundance identified hundreds of GDTA in canker versus healthy stem tissues. A significant number of additional DTA genes involved in the defense-response not reported in a previous study were identified here. These DTA genes belong to various pathways involving cell wall biosynthesis, reactive oxygen species (ROS), salicylic acid (SA), ethylene, jasmonic acid (JA), abscissic acid (ABA), and hormone signalling. DTA genes were also identified in the hypersensitive response and programmed cell death (PCD) pathways. These DTA genes are candidates for host resistance to the chestnut blight fungus, Cryphonectria parasitica.ConclusionsOur data allowed the identification of many genes and gene network candidates for host resistance to the chestnut blight fungus, Cryphonectria parasitica. The similar set of GDTAs in American chestnut and Chinese chestnut suggests that the variation in sensitivity to this pathogen between these species may be the result of different timing and amplitude of the response of the two to the pathogen infection. Resources developed in this study are useful for functional genomics, comparative genomics, resistance breeding and phylogenetics in the Fagaceae.

【 授权许可】

CC BY   
© Barakat et al; licensee BioMed Central Ltd. 2012