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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (10): 2597-2612.doi: 10.16420/j.issn.0513-353x.2024-0850

• Genetic & Breeding·Germplasm Resources·Molecular Biology • Previous Articles     Next Articles

Development and Application of Insertion-Deletion(InDel)Markers in Papaya(Carica papaya)Based on Whole Genome Re-Sequencing Data

YANG Min, HE Han, ZHOU Chenping, KUANG Ruibin, LIU Chuanhe, WU Xiaming, XU Ze, WEI Yuerong**()   

  1. Guangdong Provincial Key Laboratory of Science and Technology Research on Fruit Tree;Key Laboratory of South Subtropical Fruit Biology and Genetic Resource Utilization,Ministry of Agriculture and Rural Affairs;Institute of Fruit Tree Research,Guangdong Academy of Agricultural Sciences,Guangzhou 510640,China
  • Received:2025-03-02 Revised:2025-07-28 Online:2025-10-25 Published:2025-10-28
  • Contact: WEI Yuerong

Abstract:

InDel(insertion/deletion)loci were mined using resequencing data of 5 papaya germplasm resources,and efficient and applicable molecular markers were designed based on these loci. After strict screening,3 635 InDel loci that are easy to detect by gel electrophoresis,with a length of more than 30 bp and showing high polymorphism were successfully identified. 360 loci evenly distributed across the genome were selected to design primers. After preliminary screening with 6 papaya materials,it was found that 355 pairs of primers could successfully amplify the target products,among which 271 pairs showed significant polymorphism,accounting for 75.3% of the total number of candidate primers. 72 pairs of highly polymorphic markers were selected for genotyping and genetic diversity analysis of 47 papayagermplasms,and a total of 145 allelic loci were detected. The polymorphism information content (PIC)of the markers ranged from 0.0408 to 0.4523,with an average of 0.3041;the gene diversity index varied from 0.1030 to 0.8735,with an average of 0.5660. Through cluster analysis,the 47 papaya accessions were divided into 4 groups. In addition,based on the amplification results of 20 pairs of highly polymorphic core InDel markers,combined with 4 key agronomic traits(flower color,single fruit weight,fruit shape,and flesh color),molecular identities of different papaya germplasms were constructed. Meanwhile,two InDel markers that can reflect the differences between parents were selected to identify the authenticity of 24 F1 hybrid progenies of GT1-5 בHuangjinzhong’papaya,and 11 true hybrids were successfully confirmed.

Key words: papaya, InDel marker, genetic diversity, verification of F1 generation, molecular ID