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ARS Home » Southeast Area » Miami, Florida » Subtropical Horticulture Research » Research » Publications at this Location » Publication #296204

Research Project: Genetic Improvement of Cacao Through Genomics-Assisted Breeding

Location: Subtropical Horticulture Research

Title: Toward The identification Of candidate genes involved in black pod disease resistance in Theobroma cacao L.

item Royaert, Stefan
item Moore, John
item Santos Araujo, Iona
item Viana Da Silva, Daniela
item Martins De Jesus, Samuel
item Livingstone Iii, Donald
item Marelli, Jean-philippe
item Kuhn, David
item Gutierrez, Osman
item Correa, Ronan Xavier
item Schnell, Raymond
item Motamayor, Juan Carlos

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 1/1/2013
Publication Date: 1/11/2013
Citation: Royaert, S., Moore, J.M., Santos Araujo, I., Viana Da Silva, D., Martins De Jesus, S., Livingstone Iii, D., Marelli, J., Kuhn, D.N., Gutierrez, O.A., Correa, R., Schnell, R.J., Motamayor, J. 2013. Toward The identification Of candidate genes involved in black pod disease resistance in Theobroma cacao L.. Meeting Abstract. Plant & Animal Genome XXI Conference, San Diego, CA January 12-16, 2013.

Interpretive Summary:

Technical Abstract: Increasing yield, quality and disease resistance are important objectives for cacao breeding programs. Some of the diseases, such as black pod rot (Phytophtora spp), frosty pod (Moniliophthora roreri) and witches’ broom (M. perniciosa), produce significant losses in all or in some of the various production areas around the world. We recently identified associations for witches’ broom (WB) resistance (cushion brooms, more specifically) using 185 simple sequence repeat (SSR) markers and a segregating mapping population of 282 trees at the Mars Center for Cocoa Science (Brazil) between ‘TSH-1188’ (WB resistant) and ‘CCN-51’ (WB tolerant). Later, a more extensive set of trees (459) of the same mapping population has been genotyped with 6,000 SNPs. Phenotypic data including vegetative brooms and cushion brooms for this population was collected from 2008 to 2011 and SNP markers were associated with the different traits. The resulting fine map (3,526 SNPs, 852.8 cM) allowed us to identify significant associations for vegetative and cushion brooms, mainly on linkage groups 9, 6 and 4, and some minor associations on linkage groups 7 and 3. Further strategies, such as phasing of the parents and the offspring in order to reduce the size of the associated regions will be presented. The goal is to identify markers for Marker-Assisted-Breeding, and ultimately identify candidate genes involved in witches’ broom resistance.