Table 1. Origins of 20 synthetic accessions.

Accession name	Genotype Code	Form	Mother	Father
For each of the synthetic forms in the PBY collection the parents are given to illustrate the origin.
Resyn-Go S4	PBY021	Synthetic	B. rapa ssp.rapa	B.oleracea convar. acephala
G 50	PBY031	Synthetic	B. oleracea conv. acephala var. gongyloides	B. rapa ssp. oleifera
H44	PBY032	Synthetic	B. oleracea conv. capitata var. sabauda	B. rapa ssp. pekinensis
H 149	PBY033	Synthetic	B. oleracea conv. capitata var. medullosa	B. rapa ssp. chinensis
H 165	PBY034	Synthetic	B. oleracea conv. capitata var. sabauda	B. rapa ssp. chinensis
H 176	PBY035	Synthetic	B. oleracea conv. capitata var. sabauda	B. rapa ssp. pekinensis var. laxa
R53	PBY036	Synthetic	B. oleracea conv. capitata var. sabellica	B. rapa ssp. pekinensis
R76	PBY037	Synthetic	B. oleracea conv. botrytis var. alboglabra	B. rapa ssp. oleifera
RS 4/6	PBY038	Synthetic	B. rapa ssp. pekinensis	B. oler.conv. capitata var. sabellica x B. oler. conv. gemmifera
RS 10/7	PBY039	Synthetic	B. rapa ssp. trilocularis	B. oleracea conv. fructicosa
RS 13/6	PBY040	Synthetic	B. rapa ssp. pekinensis	B. oleracea conv. botrytis var. alboglabra
S 13	PBY041	Synthetic	B. rapa ssp. oleifera 4x	B. oleracea conv. capitata var. medullosa
OLL 1	PBY043	Synthetic	B. rapa ssp. oleifera	B. oleracea ssp. oleracea
R 99	PBY046	Synthetic	B. oleracea conv. capitata var. capitata	B. rapa ssp. pekinensis
RS 7/6	PBY047	Synthetic	B. rapa ssp. pekinensis	B. oleracea conv. capitata var. medullosa
RS 8/6	PBY048	Synthetic	B. rapa ssp. pekinensis	B. oler. conv. capitata var. medullosa x B. oler. conv. gemmifera
S 39	PBY049	Synthetic	B. oleracea conv. capitata var. capitata	B. rapa ssp. chinensis
CRY 1	PBY050	Synthetic	B. rapa ssp. trilocularis	B. cretica
HIY 1	PBY051	Synthetic	B. rapa ssp. trilocularis	B. hilarionis
MOY 4	PBY052	Synthetic	B. rapa ssp. trilocularis	B. montana