test
node1
TO:0000162
grain quality trait
node2
CO_321:0000157
wheat glutenin glu-d3
composition trait
node1->node2
node4
CO_321:0001179
wheat glud3_m_text
variable
node2->node4
node3
TO:0002728
fruit quality trait
node3->node1
node5
TO:0000597
plant quality trait
node5->node3
node6
TO:0000387
plant trait
node6->node5