Development of the first consensus genetic map of intermediate wheatgrass (Thinopyrum intermedium) using...

Area of Science:

• Plant Genomics
• Crop Science
• Molecular Breeding

Background:

• Intermediate wheatgrass (Thinopyrum intermedium) is a promising perennial crop for grain, forage, and biofuel production.
• Genomics-assisted breeding requires efficient genotyping and robust genetic marker maps for crop improvement.
• Existing genetic resources for intermediate wheatgrass are limited, hindering rapid domestication and breeding efforts.

Purpose of the Study:

• To construct the first consensus genetic map for intermediate wheatgrass (IWG).
• To provide genomic tools for accelerating molecular breeding and crop improvement in IWG.
• To confirm the allohexaploid nature and Triticeae genome homology of IWG.

Main Methods:

• Genotyping-by-sequencing (GBS) was employed to identify polymorphic markers.
• Genetic maps were constructed for 13 parents across seven full-sib families.
• A linear programming method was used to integrate individual maps into a consensus map.

Main Results:

• A consensus genetic map for IWG was generated with 21 linkage groups and 10,029 markers.
• The map spans 5061 cM, with an average marker distance of 0.5 cM.
• High collinearity and synteny were observed with the barley reference genome, revealing conserved Triticeae chromosome structures and translocations.

Conclusions:

• The developed consensus genetic map serves as a foundational tool for intermediate wheatgrass genomics and molecular breeding.
• This map facilitates the identification of important genes, such as disease resistance, accelerating the development of high-yielding cultivars.
• These genomic advancements support the sustainable intensification of agricultural systems through improved perennial grain crops.