Mapping QTLs for Black pod (Phytophthora palmivora) resistance in three hybrid progenies of cocoa (Theobroma cacao L.) using SSR markers
To identify QTLs for cacao resistance to Phytopthorapalmivora., a study was conducted in three hybrid progenies of CNRA in Côte d'Ivoire obtained from crosses (SCA6 x H) x C1, (P7 x ICS100) x C1 and (P7 x ICS95 x) x C1. SCA6 (Scavina 6) and P7 (Pound 7) are resistant Forastero clones, while ICS100, ICS95 and H are moderately susceptible Trinitario clones and C1 (IFC1), a susceptible Forastero clone. Resistance to P. palmivorawas assessed by means of pod rot rate (PRR) in field and leaf discs inoculation with zoospores (Folres) in both half-sib progenies, while only PRR was investigated in the progeny derived from (SCA6 x H) x C1. For each progeny, a SSR-based linkage map was constructed and Kruskal-Wallis test and interval mapping were applied, associating phenotypic data. Over the three progenies, 8 QTLs of PRR and 3 QTLs of Folres were detected on different chromosomes. One QTL of Folres (R2 = 17.3 %) has been identified on chromosome 10, for the first time. The chromosome 1, carrying QTLs of PRR and Folres, is an interesting support of cacao resistance to Phytophthora. Chromosomes 4 and 6, each, of of two different parents carry QTLs of PRR In addition, the association mTcCIR291-PRR, on the chromosome 6 was noted in the family derived from (SCA6 x H) x C1, as well as in one of the two half-sib families. Markers linked to QTLs are valuable potential candidates for a future exploiting of these QTLs as selection tools.
| Main Authors: | , , , , , |
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| Format: | article biblioteca |
| Language: | eng |
| Subjects: | F30 - Génétique et amélioration des plantes, H20 - Maladies des plantes, Theobroma cacao, Phytophthora palmivora, locus des caractères quantitatifs, résistance génétique, carte génétique, marqueur génétique, résistance aux maladies, phénotype, séquence nucléotidique, http://aims.fao.org/aos/agrovoc/c_7713, http://aims.fao.org/aos/agrovoc/c_27307, http://aims.fao.org/aos/agrovoc/c_37974, http://aims.fao.org/aos/agrovoc/c_35130, http://aims.fao.org/aos/agrovoc/c_24002, http://aims.fao.org/aos/agrovoc/c_24030, http://aims.fao.org/aos/agrovoc/c_2328, http://aims.fao.org/aos/agrovoc/c_5776, http://aims.fao.org/aos/agrovoc/c_27583, http://aims.fao.org/aos/agrovoc/c_4027, |
| Online Access: | http://agritrop.cirad.fr/583348/ http://agritrop.cirad.fr/583348/1/Akaza%20%28QTL%20black%20pod%29%202016.pdf |
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