Studies on Paeonia cultivars and hybrids identification based on SRAP analysis

Area of Science:

• Plant genetics
• Molecular biology
• Horticulture

Background:

• Peony (Paeonia) plants possess significant ornamental and medicinal value.
• Understanding genetic diversity is crucial for breeding and germplasm innovation in Paeonia.

Purpose of the Study:

• To investigate genetic relationships and identify hybrids among different Paeonia sections using SRAP markers.
• To develop molecular tools for distinguishing peony cultivars and sections.

Main Methods:

• Utilized Sequence Related Amplified Polymorphism (SRAP) markers on 29 Paeonia cultivars (13 sect. Moutan, 14 sect. Paeonia, 2 intersectional hybrids).
• Analyzed 197 bands from 24 primer combinations, with 187 showing polymorphism.
• Employed UPGMA dendrogram and Principal Component Analysis (PCA) for genetic relationship analysis.

Main Results:

• Successfully identified unique SRAP markers and primer combinations for distinguishing peony cultivars.
• Developed specific primer pairs (Me8/Em8, Me8/Em1) to differentiate between sections.
• Calculated mean genetic similarity (GS) of 0.45, gene diversity (GD) of 0.19, and Shannon's index of 0.32.
• UPGMA and PCA analyses clearly delineated genetic relationships among cultivars, sections, and hybrids.

Conclusions:

• SRAP markers are effective for analyzing Paeonia genetic backgrounds and relationships.
• The identified markers and primers are valuable for molecular marker-assisted selection (MAS) in breeding programs.
• This study supports informed parent selection for crossing and enhances future germplasm innovation.