Appendix 1: Information sources and search terms employed

The following databases and search engines were used

  • Google Scholar
  • Springer Exemplar
  • JSTOR
  • Web of Knowledge

The following search terms were used to search the text of publications contained in the databases and search engines

  • Springer exemplar
  • HRIGRU
  • HRI GRU
  • HRI Genetic resources unit
  • Horticulture research international genetic resources unit
  • Horticulture research international GRU
  • GRU Wellesbourne
  • Wellesbourne GRU
  • Genetic resources unit Wellesbourne
  • Wellesbourne genetic resources unit
  • National vegetable research station
  • HRI genebank
  • Horticulture research international genebank
  • Genebank HRI
  • Genebank horticulture research international
  • Genebank wellesbourne
  • Wellesbournegenebank
  • Horticulture research international
  • Brassica diversity set
  • Wellesbourne HRI
  • HRI Wellesbourne
  • Warwick GRU
  • Warwick Genetic resources unit
  • Brassica foundation set
  • Brassica fixed foundation set
  • Wellesbourne
  • JSTOR
  • ((((((HRI) AND (genetic resources unit)) OR (Brassica) OR (Daucus) OR (Lactuca) OR (Allium))
  • Google scholar (where otherwise stated all searches restricted to 1980-2016)
  • "HRI genetic resources unit" OR "Horticulture research international GRU" OR "Horticulture research international genetic resources unit"
  • "Wellesbourne genetic resources unit" OR "Genetic resources unit wellesbourne" OR "Wellesbourne GRU" OR "GRU wellesbourne"
  • HRIGRU OR "HRI GRU"
  • Horticulture research international wellesbourne "genebank"
  • "HRI" OR "Wellesbourne" AND "genetic resources unit"
  • Vegetable "genebank" AND "wellesbourne" OR "HRI"
  • Horticulture research international wellesbourne HRI "Brassica"
  • Horticulture research international wellesbourne HRI "Daucus"
  • Horticulture research international wellesbourne HRI "Lactuca"
  • Horticulture research international wellesbourne HRI "Allium"
  • Brassica "Diversity set"
  • National vegetable Research station wellesbourne genetic resources unit
  • Horticulture research international Wellesbourne HRI genetic resources unit
  • Vegetable genebank "wellesbourne" OR "HRI" OR "Horticulture research international"
  • WGB Brassica
  • WGB Daucus
  • WGB Allium
  • WGB Lacutca
  • Horticultural research international wellesbournegenebank -HRI –arabidopsis
  • "Brassica" AND "clubroot" AND "Wellesbourne"
  • HRI Genetic resources unit -hari–Robot (1990-1995, 1996-2000, 2001-2005)
  • HRI Genetic resources unit -hari -Robot –human (2006-2016)
  • Wellesbourne genetic resources unit -J.King
  • "Diversity foundation set" AND "Brassica"
  • Brassica AND "diversity" set author:Hammond
  • "Wellesbourne" AND "gene bank"
  • Further papers were found on Web of Knowledge whilst searching for
  • Songet al. 1988 1
  • Warwicket al. 1993
  • Bourneet al. 1999
  • Lemaet al. 2012
  • Soengaset al. 2006

Appendix 2: Flow diagram of systematic search illustrating process followed

*Publications did not state or it was not clear where plant material originated from. For publications after 2007 authors were contacted for more information regarding the origin of plant material, but for unclear papers the authors did not respond