Construction of a genetic linkage map in celery using DNA-based markers

Area of Science:

• Plant genetics
• Genomics
• Molecular biology

Background:

• Celery (Apium graveolens L.) comprises distinct cultivated types like var. rapaceum and var. secalinum.
• Understanding the genetic architecture of celery is crucial for crop improvement and breeding programs.

Purpose of the Study:

• To construct a high-density genetic linkage map for celery.
• To analyze marker segregation and genome structure in celery.

Main Methods:

• Utilized an F2 population derived from a cross between two celery varieties.
• Employed various molecular markers including RFLP, RAPD, isozymes, and disease resistance markers.
• Analyzed segregation patterns, linkage, and potential genome duplications.

Main Results:

• A comprehensive linkage map was constructed with 11 major and 9 small groups, totaling 803 cM.
• RAPD markers exhibited both codominant and dominant segregation, with tested allelic homologies.
• Significant segregation distortion was observed in approximately 10% of markers, indicating low detectable duplications.

Conclusions:

• The developed linkage map provides a valuable framework for celery genetic research.
• Insights into marker behavior and genome structure contribute to a better understanding of celery genetics.
• This map can support marker-assisted selection and gene discovery in celery breeding.