Deciphering the Theobroma cacao self-incompatibility system from genomics to diagnostic markers for self-compatibility

Deciphering the Theobroma cacao self-incompatibility system : from genomics to diagnostic markers for self-compatibility

© The Author 2017. Published by Oxford University Press on behalf of the Society for Experimental Biology.

Bibliographische Detailangaben
Veröffentlicht in:Journal of experimental botany. - 1985. - 68(2017), 17 vom: 13. Okt., Seite 4775-4790
1. Verfasser: Lanaud, Claire (VerfasserIn)
Weitere Verfasser: Fouet, Olivier, Legavre, Thierry, Lopes, Uilson, Sounigo, Olivier, Eyango, Marie Claire, Mermaz, Benoit, Da Silva, Marcos Ramos, Loor Solorzano, Rey Gaston, Argout, Xavier, Gyapay, Gabor, Ebaiarrey, Herman Ebai, Colonges, Kelly, Sanier, Christine, Rivallan, Ronan, Mastin, Géraldine, Cryer, Nicholas, Boccara, Michel, Verdeil, Jean-Luc, Efombagn Mousseni, Ives Bruno, Peres Gramacho, Karina, Clément, Didier
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2017
Zugriff auf das übergeordnete Werk:Journal of experimental botany
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Candidate genes Theobroma cacao diagnostic markers fine mapping gene expression immunolocalization self-incompatibility
Beschreibung
Zusammenfassung:© The Author 2017. Published by Oxford University Press on behalf of the Society for Experimental Biology.
Cocoa self-compatibility is an important yield factor and has been described as being controlled by a late gameto-sporophytic system expressed only at the level of the embryo sac. It results in gametic non-fusion and involves several loci. In this work, we identified two loci, located on chromosomes 1 and 4 (CH1 and CH4), involved in cocoa self-incompatibility by two different processes. Both loci are responsible for gametic selection, but only one (the CH4 locus) is involved in the main fruit drop. The CH1 locus acts prior to the gamete fusion step and independently of the CH4 locus. Using fine-mapping and genome-wide association studies, we focused analyses on restricted regions and identified candidate genes. Some of them showed a differential expression between incompatible and compatible reactions. Immunolocalization experiments provided evidence of CH1 candidate genes expressed in ovule and style tissues. Highly polymorphic simple sequence repeat (SSR) diagnostic markers were designed in the CH4 region that had been identified by fine-mapping. They are characterized by a strong linkage disequilibrium with incompatibility alleles, thus allowing the development of efficient diagnostic markers predicting self-compatibility and fruit setting according to the presence of specific alleles or genotypes. SSR alleles specific to self-compatible Amelonado and Criollo varieties were also identified, thus allowing screening for self-compatible plants in cocoa populations
Beschreibung:Date Completed 14.05.2018
Date Revised 13.11.2018
published: Print
Citation Status MEDLINE
ISSN:1460-2431
DOI:10.1093/jxb/erx293