Tree Genetics & Genomes

, 11:4 | Cite as

Diversity in the breadfruit complex (Artocarpus, Moraceae): genetic characterization of critical germplasm

  • Nyree Zerega
  • Tyr Wiesner-Hanks
  • Diane Ragone
  • Brian Irish
  • Brian Scheffler
  • Sheron Simpson
  • Francis Zee
Original Paper

Abstract

Breadfruit (Artocarpus altilis, Moraceae) is a traditional staple crop in Oceania and has been introduced throughout the tropics. This study examines important germplasm collections of breadfruit and its closest wild relatives and aims to (1) characterize genetic diversity, including identification of unknown and duplicate accessions, (2) evaluate genetic structure and hybridization within the breadfruit complex, and (3) compare utility of microsatellite markers to previously reported amplified fragment length polymorphism (AFLP) and isozyme markers in differentiating among cultivars. Data for 19 microsatellite loci were collected for 349 individuals (representing 255 accessions) including breadfruit (A. altilis), two wild relatives (Artocarpus camansi and Artocarpus mariannensis), and putative hybrids (A. altilis × A. mariannensis). Accessions were of mixed ploidy and regional origin, but predominantly from Oceania. Microsatellite loci collectively had a polymorphic information content (PIC) of 0.627 and distinguished 197 unique genotypes sorted into 129 different lineages, but a single genotype accounts for 49 % of all triploid breadfruit examined. Triploid hybrids and diploid A. altilis exhibited the highest levels of diversity as measured by allele number and gene diversity. Most accessions (75 %) of unknown origin matched either a known genotype or lineage group in the collection. Putative hybrids all had genetic contributions from A. mariannensis but ranged in the level of genetic contribution from A. altilis. Microsatellite markers were found to be more informative than isozyme markers and slightly less informative, with regard to accession discrimination, than AFLP markers. This set of microsatellite markers and the dataset presented here will be valuable for breadfruit germplasm management and conservation.

Keywords

Breadfruit Artocarpus Germplasm conservation management Microsatellites Plant genetic resources Underutilized crops 

Supplementary material

11295_2014_824_MOESM1_ESM.xlsx (82 kb)
Online Resource 1Data from Table 1 is provided in a spreadsheet so that it may be manipulated by users who would like to sort by different criteria (XLSX 81 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Nyree Zerega
    • 1
    • 2
  • Tyr Wiesner-Hanks
    • 1
  • Diane Ragone
    • 3
  • Brian Irish
    • 4
  • Brian Scheffler
    • 5
  • Sheron Simpson
    • 5
  • Francis Zee
    • 6
  1. 1.Plant Biology and ConservationNorthwestern UniversityEvanstonUSA
  2. 2.Department of Plant ScienceChicago Botanic GardenGlencoeUSA
  3. 3.Breadfruit InstituteNational Tropical Botanical GardenKalaheoUSA
  4. 4.Tropical Agriculture Research StationUSDA-ARSMayagüezPuerto Rico
  5. 5.Genomics and Bioinformatics Research UnitUSDA-ARSStonevilleUSA
  6. 6.Pacific Basin Agricultural Research Center (PBARC)USDA-ARSHiloUSA

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