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United States Department of Agriculture

Agricultural Research Service

Related Topics

Research Project: Genomic Charecterization and Management of Fungal Diseases of Cacao

Location: Sustainable Perennial Crops

2012 Annual Report


1a.Objectives (from AD-416):
The goal of this project is to investigate the mechanisms involved in the interactions between cacao, pathogens of cacao, and biocontrol agents in order to develop effective disease management strategies leading to sustainable yield improvements of cacao. Over the next 5 years we will focus on the following objectives: Objective 1: Discover and characterize key disease-inciting genes and genetic pathways of Moniliophthora species pathogenic on cacao. Objective 2: Discover and characterize genes and genetic pathways of endophytic biological control organisms critical to limiting diseases caused by Moniliophthora species in cacao. Objective 3: Optimize and deploy biological agents and formulations for managing cacao diseases caused by Moniliophthora species.


1b.Approach (from AD-416):
Pathosystem/biocontrol interactions will be studied at the molecular level through transcriptome anaylsis using deep sequencing technologies which will exploit recently acquired plant and fungal genomes, and by microscopic analysis of florescent protein tagged microbes. The primary microbes targeted for study will be Trichoderma spp. and Moniliophthora roreri (frosty pod rot) but will also include Phytophthora species (black pod), Moniliophthora perniciosa (witches’ broom), and beneficial Bacillus spp. Specific microbial genes identified in the expression studies will be subjected to functional analysis to reveal their importance to pathogen/biocontrol/host interactions using transformation protocols and advanced RNAi techniques. Transcriptome sequences will be used to develop genetic markers (single nucleotide polymorphisms) for M. roreri to characterize its diversity throughout Latin America and to monitor population changes as they respond to the establishment of partially resistant cacao clones in Central America. Building on molecular knowledge and recent successes with biocontrol in the field, combinations of previously screened Bacillus and Trichoderma isolates will be evaluated in the field in Ecuador for synergy in managing cacao diseases. Biocontrol formulations will be optimized to reduce the cost of application by using low-cost, locally available components and minimizing application volumes. Ultimately, the best available biological agents and formulation combinations will be tested along with optimum management practices on large plots of elite cacao clones.


3.Progress Report:
This is the first report for Project 1275-21220-252-00D, which replaces Project 1275-21220-225-00D. For additional information concerning previous research and accomplishments associated with Project 1275-21220-252-00D, see the annual report for project 1275-21220-225-00D. Since this project is only recently initiated in 2012, there is no progress to report.


Last Modified: 7/30/2014
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