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Chestnut resistance to the blight disease: insights from transcriptome analysis
Abdelali Barakat1, Meg Staton, Chun-Huai Cheng
1The School of Forest Resources, and The Huck Institutes of the Life Sciences, Pennsylvania State University, 326 Forest Resources Building, University Park, PA 16802, USA. abaraka@clemson.edu
BMC Plant Biology
|March 21, 2012
Summary
Researchers identified defense genes in American and Chinese chestnut to combat Chestnut Blight Disease (CBD). This study aids in breeding resistant chestnut trees by pinpointing key genes involved in plant defense pathways.
Area of Science:
- Plant genomics
- Forest pathology
- Molecular biology
Background:
- Chestnut Blight Disease (CBD) caused by Cryphonectria parasitica decimated American chestnut populations.
- Backcross breeding aims to introgress resistance from Chinese chestnut into American chestnut.
- Genomic resources for Fagaceae family, specifically American and Chinese chestnut, are crucial for identifying blight resistance genes.
Purpose of the Study:
- To further analyze transcriptomes of American and Chinese chestnut using a larger dataset.
- To identify defense-related genes with differential transcript abundance (GDTA) in diseased versus healthy tissues.
- To develop genomic resources for aiding backcross breeding and map-based cloning of resistance genes.
Main Methods:
- Assembly of over 1.5 million cDNA reads into transcript contigs for both species.
- In silico analysis of transcript abundance to identify differentially abundant genes (GDTA).
- Comparative analysis of transcriptomes from healthy and canker stem tissues.
Main Results:
- Assembly yielded 34,800 contigs for American chestnut and 48,335 for Chinese chestnut.
- Hundreds of GDTA were identified, including many not previously reported.
- Identified genes involved in cell wall biosynthesis, ROS, SA, ethylene, JA, ABA signaling, hypersensitive response, and programmed cell death.
Conclusions:
- Identified numerous candidate genes and networks for host resistance to C. parasitica.
- Suggests differential timing and amplitude of defense responses contribute to varying susceptibility.
- Developed valuable resources for functional genomics, comparative genomics, resistance breeding, and phylogenetics in Fagaceae.
