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

ABSTRACT: 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 compati

SUBMITTER: Lanaud C 

PROVIDER: S-EPMC5853246 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature