Autopolyploid inheritance and a heterozygous reciprocal translocation shape chromosome genetic behavior in tetraploid blueberry (Vaccinium corymbosum)

Molla F. Mengist, Hamed Bostan, Domenico De Paola, Scott J. Teresi, Adrian E. Platts, Gaetana Cremona, Xinpeng Qi, Ted Mackey, Nahla V. Bassil, Hamid Ashrafi, Lara Giongo, Rubina Jibran, David Chagné, Luca Bianco, Mary A. Lila, Lisa J. Rowland, Marina Iovene, Patrick P. Edger, Massimo Iorizzo

Research output: Contribution to journalArticlepeer-review


Understanding chromosome recombination behavior in polyploidy species is key to advancing genetic discoveries. In blueberry, a tetraploid species, the line of evidences about its genetic behavior still remain poorly understood, owing to the inter-specific, and inter-ploidy admixture of its genome and lack of in depth genome-wide inheritance and comparative structural studies. Here we describe a new high-quality, phased, chromosome-scale genome of a diploid blueberry, clone W85. The genome was integrated with cytogenetics and high-density, genetic maps representing six tetraploid blueberry cultivars, harboring different levels of wild genome admixture, to uncover recombination behavior and structural genome divergence across tetraploid and wild diploid species. Analysis of chromosome inheritance and pairing demonstrated that tetraploid blueberry behaves as an autotetraploid with tetrasomic inheritance. Comparative analysis demonstrated the presence of a reciprocal, heterozygous, translocation spanning one homolog of chr-6 and one of chr-10 in the cultivar Draper. The translocation affects pairing and recombination of chromosomes 6 and 10. Besides the translocation detected in Draper, no other structural genomic divergences were detected across tetraploid cultivars and highly inter-crossable wild diploid species. These findings and resources will facilitate new genetic and comparative genomic studies in Vaccinium and the development of genomic assisted selection strategy for this crop.

Original languageEnglish (US)
Pages (from-to)1024-1039
Number of pages16
JournalNew Phytologist
Issue number3
StatePublished - Feb 2023


  • autopolyploid
  • blueberry (Vaccinium corymbosum L.)
  • centromeric repeat
  • chromosomal translocation
  • chromosome structure
  • phased genome
  • polyploid genetic behavior

ASJC Scopus subject areas

  • Physiology
  • Plant Science


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