Inheritance and genetic mapping of self-incompatibility in Coffea canephora Pierre

Area of Science:

• Plant breeding
• Genetics
• Reproductive biology

Background:

• Understanding self-incompatibility in Coffea camphora is crucial for breeding programs.
• Doubled haploid (DH) genotypes offer genetically homogenous material for precise studies.
• Previous research has not fully elucidated the genetic control of self-incompatibility in this species.

Purpose of the Study:

• To investigate the cross-compatibility behavior of DH and hybrid genotypes of Coffea camphora.
• To determine the genetic basis of self-incompatibility in C. canephora.
• To identify molecular markers linked to the self-incompatibility locus for breeding applications.

Main Methods:

• Phenotypic bioassay and in situ seed-set examination were employed.
• Aniline blue fluorescence (ABF) method was used to detect callose accumulation.
• Molecular marker linkage analysis, including RFLP, was performed.

Main Results:

• Clear cross-compatibility and incompatibility situations were observed and confirmed.
• Self-incompatibility in C. canephora was confirmed as a gametophytic system controlled by a single S-locus.
• A significant association was found between the S-locus and an RFLP marker on linkage group 9.

Conclusions:

• The study successfully characterized the self-incompatibility system in Coffea camphora DHs.
• A linked DNA marker for the S-locus was identified, which will aid future genetic analyses.
• These findings have direct implications for improving coffee breeding strategies through marker-assisted selection.